question stringlengths 1 6.54k | choices listlengths 4 4 | answer stringclasses 4
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What can radioactive strontium replace in the human body making it dangerous? | [
"potassium",
"magnesium",
"oxygen",
"calcium"
] | D | Radioactive strontium is dangerous because it can chemically replace calcium in the human body. The bones are particularly susceptible to radiation damage. Write the nuclear equation for the beta emission of strontium-90. | train | sciq | null |
Silicon with an element that gives it extra electrons is which type of semiconductor? | [
"n-type",
"i.g - type",
"k. - type",
"m. Type"
] | A | An n-type (negative-type) semiconductor consists of silicon and an element such as phosphorus that gives the silicon crystal extra electrons. You can see this in the Figure above . An n-type semiconductor is like the negative terminal of a battery. | train | sciq | null |
Cold sores, influenza, and the common cold are all? | [
"digestive infections",
"anal infections",
"viral infections",
"trend infections"
] | C | train | sciq | null | |
What helps to propel sponge larvae through the water? | [
"mucus",
"antennae",
"tentacles",
"cilia"
] | D | Unlike sponge adults, sponge larvae can swim. They have cilia that propel them through the water. As larvae develop and grow, they become more similar to an adult sponge and lose their ability to swim. | train | sciq | null |
The majority of cells in blood are erythrocytes or? | [
"Deep Blood Cells",
"red blood cells",
"50.3 blood cells",
"s.a blood cells"
] | B | Primary Centers of the Immune System Although the immune system is characterized by circulating cells throughout the body, the regulation, maturation, and intercommunication of immune factors occur at specific sites. The blood circulates immune cells, proteins, and other factors through the body. Approximately 0.1 perc... | train | sciq | null |
Which gases trap heat in the atmosphere? | [
"fluorine and nitrogen",
"ozone",
"greenhouse",
"methane and helium"
] | C | Greenhouse gases trap heat in the atmosphere. These gases include carbon dioxide, methane, water vapor, and ozone. | train | sciq | null |
The arrangement of what plant structures can be classified as either alternate, spiral, or opposite? | [
"spores",
"leaves",
"roots",
"fruits"
] | B | Leaf Arrangement The arrangement of leaves on a stem is known as phyllotaxy. The number and placement of a plant’s leaves will vary depending on the species, with each species exhibiting a characteristic leaf arrangement. Leaves are classified as either alternate, spiral, or opposite. Plants that have only one leaf per... | train | sciq | null |
Acceleration is defined as the change in what over time? | [
"direction",
"velocity",
"mass",
"volume"
] | B | What is the speed of the bird in Exercise 2.4? 6. Acceleration is the change in velocity over time. Given this information, is acceleration a vector or a scalar quantity? Explain. A weather forecast states that the temperature is predicted to be scalar quantity? Explain. | train | sciq | null |
Some protists absorb nutrients from decaying matter like a what? | [
"insects",
"fungus",
"mite",
"plant"
] | B | Some protists absorb nutrients from decaying matter like a fungus. | train | sciq | null |
What noble gas follows hydrogen on the periodic table? | [
"helium",
"nitrogen",
"halogen",
"oxygen"
] | A | Following hydrogen is the noble gas helium, which has an atomic number of 2. The helium atom contains two protons and two electrons. The first electron has the same four quantum numbers as the hydrogen atom electron (n = 1, l = 0, ml = 0, m s = + 1 ). The second electron also goes into the 1s orbital and fills that orb... | train | sciq | null |
What is the order and family of a meat-eating cat like a tiger? | [
"Synapsida felidae",
"hierarchies felidae",
"carnivora felidae",
"Mammalia felidae"
] | C | Most chordates are animals with backbones. These range from small fish to giant whales, from playful dogs to ferocious cats. Not nearly as diverse as the invertebrates. But chordates do have many amazing species. The white tiger ( Panthera tigris ) is a chordate. The tiger is also from the class Mammalia, order Carnivo... | train | sciq | null |
What is required between cytoskeleton and motor proteins for cell motility? | [
"interaction",
"translation",
"absorption",
"inhibition"
] | A | train | sciq | null | |
Underground rock in a molten state is called? | [
"magma",
"gaseous",
"igneous",
"lava"
] | A | A: It is always very hot deep underground where molten rock originates. The high temperatures give rock enough energy to melt and remain in a molten state. Underground rock in this state is called magma. | train | sciq | null |
What takes over the synthesis and secretion of progesterone throughout pregnancy as the corpus luteum degenerates? | [
"ovaries",
"placenta",
"uterus",
"vagina"
] | B | The placenta takes over the synthesis and secretion of progesterone throughout pregnancy as the corpus luteum degenerates. Like estrogen, progesterone suppresses FSH and LH. It also inhibits uterine contractions, protecting the fetus from preterm birth. This hormone decreases in late gestation, allowing uterine contrac... | train | sciq | null |
Distillation is an effective method to separate mixtures comprised of two or more what? | [
"pure liquids",
"ionic compounds",
"elements",
"solutes"
] | A | Distillation is an effective method to separate mixtures comprised of two or more pure liquids. Distillation is a purification process in which the components of a liquid mixture are vaporized (transformed from liquid to gas) and then condensed (transformed from gas back to liquid) and isolated. In a simple distillatio... | train | sciq | null |
Aids is an infectious disease of which system? | [
"digestion",
"immune",
"endocrine",
"muscular"
] | B | AIDS is an infectious disease of the immune system caused by a virus. Some diseases of the immune system are noninfectious. They include autoimmune diseases and allergies. | train | sciq | null |
Where are the olfactory organs of snails located? | [
"their tentacles",
"their feet",
"their anus",
"their shell"
] | A | Gastropods include snails and slugs. They use their foot to crawl. They have a well-developed head. There are many thousands of species of sea snails and sea slugs, as well as freshwater snails, freshwater limpets, land snails and land slugs. Gastropods live in many diverse habitats, from gardens to deserts and mountai... | train | sciq | null |
What is the term for a pure substance that possesses unique properties and cannot be broken down into other substances? | [
"light",
"plastic",
"element",
"alloy"
] | C | An element is pure substance that cannot be broken down into other substances. Each element has a particular set of properties that, taken together, distinguish it from all other elements. Table below lists the major elements in the human body. As you can see, you consist mainly of the elements oxygen, carbon, and hydr... | train | sciq | null |
What is the term for a cross in which the inheritance of two characteristics are tracked at the same time? | [
"identical twin",
"dihybrid cross",
"Mendelian",
"fraternal"
] | B | After Mendel's first set of experiments, Mendel wanted to see if the inheritance of characteristics were dependent, or were they independent events. Mendel asked if the segregation of the heritable factors (allele) for one characteristic (gene) had any effect of the segregation of the factors for another characteristic... | train | sciq | null |
Through what system of the body do hormones generally travel? | [
"respiratory",
"endocrine",
"excretory",
"circulatory system"
] | D | train | sciq | null | |
What sort of digestion do animals engage in? | [
"essential",
"internal",
"external",
"poison"
] | B | Virtually all animals have internal digestion of food. Animals consume other organisms and may use special tissues and organs to digest them. (Other heterotrophs, such as fungi, absorb nutrients directly from the environment. ). | train | sciq | null |
What is the most abundant biochemical compound? | [
"tissue",
"soil",
"methane",
"cellulose"
] | D | Cellulose is another complex carbohydrate found in plants that is a polymer of glucose. Cellulose molecules bundle together to form long, tough fibers. Cellulose is the most abundant biochemical compound. It makes up the cell walls of plants and gives support to stems and tree trunks. | train | sciq | null |
When organisms penetrate a rock, they accelerate breakdown by chemical means and what other means? | [
"temperature",
"geological",
"ecological",
"mechanical"
] | D | train | sciq | null | |
What determines velocity? | [
"direction",
"change in direction",
"mass per unit",
"distance over time in a given direction"
] | D | Figure 28.14 Classically, velocities add like ordinary numbers in one-dimensional motion. Here the girl throws a snowball forward and then backward from a sled. The velocity of the sled relative to the Earth is relative to the Earth is. | train | sciq | null |
What term is used to describe a simple diagram that shows one way energy flows through an ecosystem? | [
"food chain",
"water cycle",
"food pyramid",
"fuel chain"
] | A | A food chain is a simple diagram that shows one way energy flows through an ecosystem. You can see an example of a food chain in Figure below . Producers form the base of all food chains. The consumers that eat producers are called primary consumers. The consumers that eat primary consumers are secondary consumers. Thi... | train | sciq | null |
How can nuclear fusion in stars be simulated? | [
"nuclear reactors",
"nitrogen accelerators",
"particle accelerators",
"plutonium accelerators"
] | C | Particle accelerators simulate nuclear fusion in stars. | train | sciq | null |
What type of tissue transmits nerve impulses throughout the body? | [
"fibrous",
"epithelial",
"nervous",
"connective"
] | C | train | sciq | null | |
Animals produce most of what chemicals, which are needed to synthesize the fatty acids they need? | [
"carbohydrates",
"solvents",
"enzymes",
"hormones"
] | C | train | sciq | null | |
How do parathyroid hormones react as a body ages? | [
"help with age",
"decrease with age",
"increase with age",
"use with age"
] | C | Low levels of estrogens and progesterone are also associated with some disease states, such as osteoporosis, atherosclerosis, and hyperlipidemia, or abnormal blood lipid levels. Testosterone levels also decline with age, a condition called andropause (or viropause); however, this decline is much less dramatic than the ... | train | sciq | null |
What describe the fraction or percentage of a mixture that is made up of a particular substance. | [
"molecular scale",
"atomic weight",
"solute level",
"mole fractions"
] | D | Mole fractions describe the fraction or percentage of a mixture that is made up of a particular substance. | train | sciq | null |
What are the most numerous organisms in the world? | [
"jellyfish",
"reptiles",
"primates",
"insects"
] | D | Insects are arthropods in the class Hexapoda. They are the most numerous organisms in the world. | train | sciq | null |
What helps push the fetus from the uterus during birth? | [
"tremors",
"glands",
"contractions",
"Shaking"
] | C | Near the time of birth, the amniotic sac breaks in a gush of liquid. Labor usually begins within a day of this event. Labor involves contractions of the muscular walls of the uterus. With the mother’s help, the contractions eventually push the fetus out of the uterus and through the vagina. | train | sciq | null |
Telescopes use which kind of lenses to enlarge images? | [
"spherical",
"convex",
"crystalline",
"concave"
] | B | Like microscopes, telescopes use convex lenses to make enlarged images. However, telescopes make enlarged images of objects—such as distant stars—that only appear tiny because they are very far away. There are two basic types of telescopes: reflecting telescopes and refracting telescopes. The two types are compared in ... | train | sciq | null |
How does uric acid react to water? | [
"mixes",
"explodes",
"does not form",
"does not dissolve"
] | D | train | sciq | null | |
Which kingdom are mosses and trees included in? | [
"plant",
"protista",
"gymnosperm",
"fungus"
] | A | Mateusz Kulawik. Mosses and trees are all part of the plant kingdom . CC BY 2.0. | train | sciq | null |
What is the developing human organism referred to as from the end of the eighth week until birth? | [
"nucleus",
"babies",
"egg",
"fetus"
] | D | From the end of the eighth week until birth, the developing human organism is referred to as a fetus . Birth typically occurs at about 38 weeks after fertilization, so the fetal period generally lasts about 30 weeks. During this time, as outlined in Figure below , the organs complete their development. The fetus also g... | train | sciq | null |
In an acidic medium, add which ions to balance? | [
"magnesium",
"hydrogen",
"helium",
"calcium"
] | B | Now the hydrogen atoms need to be balanced. In an acidic medium, add hydrogen ions to balance . In this example, fourteen H + ions will be added to the reactant side. | train | sciq | null |
Which type of plankton make food via photosynthesis? | [
"common plankton",
"dinoflagellates",
"phytoplankton",
"zooplankton"
] | C | Phytoplankton are “plant-like” plankton. Since they make food by photosynthesis, they live in the photic zone. Most are algae. | train | sciq | null |
What is capable of altering the rate of time passing? | [
"strong magnetic fields",
"weak gravitational fields",
"strong planetary fields",
"strong gravitational fields"
] | D | Strong gravitational fields can alter the rate of time passing. True. | train | sciq | null |
Damages and deaths are directly affected by what in an earthquake? | [
"structures",
"natural",
"shaking",
"construction"
] | D | The type of construction has a tremendous effect on what happens during an earthquake. Damage and deaths are directly affected by the construction in an earthquake. For example, enormous damage was done in the 2011 Christchurch, New Zealand earthquake. However, far less was damaged in an earthquake of the same magnitud... | train | sciq | null |
What is the the basic si unit for mass? | [
"pound",
"volume",
"density",
"kilogram (kg)"
] | D | Mass measures the amount of matter in a substance or an object. The basic SI unit for mass is the kilogram (kg). | train | sciq | null |
What are objects that are launched into the air called? | [
"stones",
"booms",
"projectiles",
"shoots"
] | C | Objects that are launched into the air are called projectiles . The path followed by a projectile in motion is called a trajectory . The image of the snowboarder in the chapter introduction showed his trajectory; every object has a trajectory even when we cannot see it. Projectile motion , or the object's trajectory, i... | train | sciq | null |
What are hydrocarbons with double bonds called? | [
"alcohols",
"amines",
"alkenes",
"aldehydes"
] | C | Unsaturated hydrocarbons contain at least one double or triple bond between carbon atoms. Hydrocarbons with double bonds are called alkenes. Those with triple bonds are called alkynes. Aromatic hydrocarbons consist of six carbon atoms in a ring shape, connected by alternating single and double bonds. | train | sciq | null |
What is the liquid component in blood? | [
"respiration",
"plasma",
"hemoglobin",
"aqueous humor"
] | B | Blood is a fluid connective tissue that contains a liquid component called plasma. | train | sciq | null |
Functional groups are groups of atoms that occur within molecules and confer specific chemical properties to those molecules. they are found along the “carbon backbone” of what? | [
"inorganic molecules",
"micromolecules",
"macromolecules",
"functional molecules"
] | C | Functional Groups Functional groups are groups of atoms that occur within molecules and confer specific chemical properties to those molecules. They are found along the “carbon backbone” of macromolecules. This carbon backbone is formed by chains and/or rings of carbon atoms with the occasional substitution of an eleme... | train | sciq | null |
Predators can replace what tool in agriculture. | [
"irrigators",
"pesticides",
"harvesters",
"fertilizer"
] | B | Predator species such as birds and spiders control insect pests. They reduce the need for chemical pesticides, which are expensive and may be harmful to human beings and other organisms. | train | sciq | null |
What is a mixture of eroded rock, minerals, partly decomposed organic matter, and other materials called? | [
"sand",
"soil",
"loam",
"sediment"
] | B | Soil is a mixture of eroded rock, minerals, partly decomposed organic matter, and other materials. It is essential for plant growth, so it is the foundation of terrestrial ecosystems. Soil is important for other reasons as well. For example, it removes toxins from water and breaks down wastes. | train | sciq | null |
All cells need what for energy? | [
"glucose",
"light",
"oxygen",
"insulin"
] | A | Glucose is a substance that passes across cell membranes by facilitated diffusion. All cells need glucose for energy. | train | sciq | null |
In an experiment, what is the affected variable called? | [
"control variable",
"independent variable",
"dependent variable",
"form variable"
] | C | An experiment generally tests how one variable is affected by another. The affected variable is called the dependent variable . In the plant experiment shown above, the dependent variable is plant growth. The variable that affects the dependent variable is called the independent variable . In the plant experiment, the ... | train | sciq | null |
Does the stream-lined body featured on most fish increase or decrease water resistance? | [
"increases",
"precipitates",
"decrease",
"quickens"
] | C | Fish typically have a stream-lined body. This reduces water resistance. | train | sciq | null |
What is the role of the sodium ion in the neutralization reaction of sodium flouride? | [
"circuit ion",
"spectator ion",
"reflection ion",
"team ion"
] | B | Since sodium fluoride is soluble, the sodium ion is a spectator ion in the neutralization reaction. The fluoride ion is capable of reacting, to a small extent, with water, accepting a proton. | train | sciq | null |
What is the name of the line used in topographic maps that shows different elevations? | [
"a crater line",
"a contour line",
"a curve line",
"a patch line"
] | B | Mapping is an important part of Earth Science. Topographic maps use a line, called a contour line, to show different elevations on a map. Contour lines show the location of hills, mountains and valleys. A regular road map shows where a road goes. But a road map doesn’t show if the road goes over a mountain pass or thro... | train | sciq | null |
Sporangia produce spores that develop into tiny, heart-shaped what? | [
"tubules",
"cells",
"gametophytes",
"filaments"
] | C | A mature sporophyte fern has the familiar leafy fronds. The undersides of the leaves are dotted with clusters of sporangia. Sporangia produce spores that develop into tiny, heart-shaped gametophytes. Gametophytes have antheridia and archegonia. Antheridia produce sperm with many cilia; archegonia produce eggs. Fertiliz... | train | sciq | null |
A long chain of mountains that rises up high above the deep seafloor is called? | [
"oceanic alps",
"blue ridge mountains",
"mid-ocean ridges",
"sea mounds"
] | C | mid-ocean ridges : A long chain of mountains that rises up high above the deep seafloor. An example is the light blue gash in middle of Atlantic Ocean. Light blue is higher elevation than dark blue. | train | sciq | null |
When bacteria are destroyed by leukocytes, what are released into the blood? | [
"carcinogens",
"sporozoans",
"proteins",
"pyrogens"
] | D | When bacteria are destroyed by leukocytes, pyrogens are released into the blood. Pyrogens reset the body’s thermostat to a higher temperature, resulting in fever. How might pyrogens cause the body temperature to rise?. | train | sciq | null |
Hierarchical classification can reflect the branching patterns of phylogenetic? | [
"birds",
"fruits",
"trees",
"animals"
] | C | train | sciq | null | |
Unstable isotopes give off particles and energy as what? | [
"ultraviolet light",
"radioactivity",
"electricity",
"radiation"
] | B | train | sciq | null | |
What structure is an organelle that contains enzymes that break down and digest unneeded cellular components? | [
"centrosome",
"peroxisome",
"lysosome",
"tissue"
] | C | Lysosomes Some of the protein products packaged by the Golgi include digestive enzymes that are meant to remain inside the cell for use in breaking down certain materials. The enzyme-containing vesicles released by the Golgi may form new lysosomes, or fuse with existing, lysosomes. A lysosome is an organelle that conta... | train | sciq | null |
What is the unit used to measure voltage? | [
"ohm",
"ampere",
"watt",
"volts"
] | D | Electric current occurs whenever there is a difference in electric potential energy, or voltage. Voltage is measured in volts (V). | train | sciq | null |
What type of gases are used for balloons, light bulbs and lighted signs? | [
"helium",
"heavy",
"ignoble",
"noble"
] | D | Noble gases are used for balloons, light bulbs, and lighted signs. | train | sciq | null |
Some living things on the ocean floor are sources of what human necessity? | [
"medicines",
"hormones",
"steroids",
"pesticides"
] | A | The ocean floor is home to many species of living things. Some from shallow water are used by people for food. Clams and some fish are among the many foods we get from the ocean floor. Some living things on the ocean floor are sources of human medicines. For example, certain bacteria on the ocean floor produce chemical... | train | sciq | null |
Many protists form what kind of beneficial association with other species? | [
"Facultative",
"evolved",
"symbiotic",
"Opportunistic"
] | C | train | sciq | null | |
When two of these meet, the result is often a storm? | [
"air masses",
"air pockets",
"tectonic plates",
"electromagnetic waves"
] | A | In displacement versus time graphs, the slope of the line is the velocity of the object. In this case of a velocity versus time graph, the slope of the line is the acceleration. If you take any segment of this line and determine the to ratio, you will get 6.0 m/s 2 which we know to be the constant acceleration of this ... | train | sciq | null |
What causes food to move through the esophagus? | [
"apoptosis",
"proteolysis",
"peristalsis",
"photosynthesis"
] | C | The esophagus is a narrow tube that carries food from the throat to the stomach. Food moves through the esophagus because of peristalsis. At the lower end of the esophagus, a circular muscle controls the opening to the stomach. The muscle relaxes to let food pass into the stomach. Then the muscle contracts again to pre... | train | sciq | null |
What do we call the solid form of hydrocarbons? | [
"coal",
"shale",
"methane",
"bauxite"
] | A | Fossil fuels are compounds of carbon and hydrogen, called hydrocarbons . Hydrocarbons can be solid, liquid, or gas. The solid form is coal. The liquid form is petroleum, or crude oil. The gaseous form is natural gas. | train | sciq | null |
What is needed to create muscles, regulate chemical reactions, and transport oxygen? | [
"enzymes",
"lipids",
"cytoplasm",
"proteins"
] | D | Your body needs proteins to create muscles, regulate chemical reactions, transport oxygen, and perform other important tasks in your body. But how are these proteins built? They are made up of units called amino acids. Just like there are only a few types of blocks in a set, there are a limited number of amino acids. B... | train | sciq | null |
What does the vertebral column , or backbone, protect? | [
"spinal cord",
"axons",
"neurons",
"disks"
] | A | The primary feature shared by all vertebrates is the vertebral column , or backbone. The vertebral column protects the spinal cord. | train | sciq | null |
X rays and what other type of electromagnetic wave has the shortest wavelengths and the highest frequencies? | [
"X-rays",
"gamma rays",
"plasma rays",
"ultraviolet rays"
] | B | On the far right are X rays and gamma rays. The have the shortest wavelengths and highest frequencies of all electromagnetic waves. They also have the greatest amount of energy. | train | sciq | null |
The anterior pituitary produces seven different what, each with a special function? | [
"enzymes",
"proteins",
"hormones",
"neurotransmitters"
] | C | Anterior Pituitary The anterior pituitary gland, or adenohypophysis, is surrounded by a capillary network that extends from the hypothalamus, down along the infundibulum, and to the anterior pituitary. This capillary network is a part of the hypophyseal portal system that carries substances from the hypothalamus to the... | train | sciq | null |
What is the term for the measure of the average kinetic energy of the particles in matter? | [
"friction",
"precipitation",
"voltage",
"temperature"
] | D | Temperature is a measure of the average kinetic energy of the particles in matter. | train | sciq | null |
Pepsin and trypsin are examples of enzymes involved in what bodily process? | [
"regeneration",
"perspiration",
"digestion",
"filtration"
] | C | Various conditions affect enzyme function. Pepsin and trypsin are two digestive enzymes that work in contrasting environments. | train | sciq | null |
What is the only metalloid in group 13? | [
"phosphorus",
"alluminum",
"gallium",
"boron"
] | D | Group 13 is called the boron group, and boron is the only metalloid in this group. The other group 13 elements are metals. | train | sciq | null |
How is a mammal developed if not inside of a placenta or a pouch? | [
"mitosis",
"cloning",
"spawning or budding",
"hatched from eggs"
] | D | This is a mammal. But it is unlike placental or marsupial mammals. If a mammal does not develop within a placenta or a pouch, what type of development is left? Eggs!. | train | sciq | null |
Slime molds have several morphological similarities to fungi, including spore-generation, that are thought to be the result of convergent what? | [
"evolution",
"phenomenon",
"generation",
"emergence"
] | A | Slime Molds A subset of the amoebozoans, the slime molds, has several morphological similarities to fungi that are thought to be the result of convergent evolution. For instance, during times of stress, some slime molds develop into spore-generating fruiting bodies, much like fungi. The slime molds are categorized on t... | train | sciq | null |
What do willow trees produce to kill bacteria? | [
"enzymes",
"cytoplasmic acid",
"salicylic acid",
"chlorophyll"
] | C | Plants don’t have immune systems, but they do respond to disease. Typically, their first line of defense is the death of cells surrounding infected tissue. This prevents the infection from spreading. Many plants also produce hormones and toxins to fight pathogens. For example, willow trees produce salicylic acid to kil... | train | sciq | null |
The ph scale is a scale used to express the concentration of hydrogen ions in solution. a neutral solution, neither acidic nor basic, has a ph of what? | [
"8",
"0",
"6",
"7"
] | D | dissociated ions. It is a dynamic equilibrium because acid and base molecules are constantly dissociating into ions and reassociating into neutral molecules. The pH scale is a scale used to express the concentration of hydrogen ions in solution. A neutral solution, neither acidic nor basic, has a pH of 7. Acidic soluti... | train | sciq | null |
What is the term for something left behind by once-living organisms? | [
"deposits",
"fossils",
"waste matter",
"decay"
] | B | Most sedimentary rocks form from sediments. Sediments are small pieces of other rocks, like pebbles, sand, silt, and clay. Sedimentary rocks may include fossils. Fossils are materials left behind by once-living organisms. Fossils can be pieces of the organism, like bones. They can also be traces of the organism, like f... | train | sciq | null |
What connects the peripheral nervous system to the central nervous system? | [
"wires",
"fibers",
"veins",
"nerves"
] | D | The peripheral nervous system consists of all the nervous tissue that lies outside the central nervous system. It is connected to the central nervous system by nerves. | train | sciq | null |
In which supergroup are red algae and green algae included? | [
"archaeplastida",
"spirogyra",
"xerophyte",
"troglodyte"
] | A | Archaeplastida Red algae and green algae are included in the supergroup Archaeplastida. It was from a common ancestor of these protists that the land plants evolved, since their closest relatives are found in this group. Molecular evidence supports that all Archaeplastida are descendents of an endosymbiotic relationshi... | train | sciq | null |
If a machine only changes the direction of a force without changing the ratio of the output/input forces, then what is its associated mechanical advantage? | [
"2",
"1",
"4",
"1.5"
] | B | For machines that change only the direction of the force, such as the rope systems on flagpoles, the output force is the same as the input force. Therefore, the mechanical advantage is equal to 1. | train | sciq | null |
What is an advantage of brightly colored fruits? | [
"attract animals to disperse their seeds",
"warning of poisons",
"dyes for clothing",
"make pretty paintings"
] | A | Brightly colored fruits attract animals that may disperse their seeds. It’s hard to miss the bright red apples on these trees. | train | sciq | null |
What is the apt term for the very slow movement of rock and soil down a hillside? | [
"creep",
"glide",
"drop",
"landslide"
] | A | Creep is the very slow movement of rock and soil down a hillside. Creep occurs so slowly you can’t see it happening. You can only see the effects of creep after years of movement ( Figure below ). The slowly moving ground causes trees, fence posts, and other structures on the surface to tilt downhill. | train | sciq | null |
The zeros at the end of a number are known as what? | [
"rest zeros",
"trailing zeros",
"remaining zeros",
"edge zeros"
] | B | Trailing zeros, which are zeros at the end of a number, are significant only if the number has a decimal point. Thus, in 1,500, the two trailing zeros are not. | train | sciq | null |
Does water get colder or warmer the deeper you go? | [
"colder",
"warmer",
"colder, than warmer",
"neither"
] | A | Water also gets colder as you go deeper. The weight of the water pressing down from above increases as well. At great depths, life becomes very difficult. The pressure is so great that only specially adapted creatures can live there. | train | sciq | null |
Many transition metals and their compounds are used as what? | [
"bases",
"insulators",
"catalysts",
"sealants"
] | C | Many transition metals and their compounds are used as catalysts. Given MnO 2, FeCl3, Pt, and Ni, which would you select for each purpose and why?. | train | sciq | null |
What do willow trees produce to kill bacteria? | [
"bacterial acid",
"Posion",
"salicylic acid",
"facultative acid"
] | C | Many plants also produce hormones and toxins to fight pathogens. For example, willow trees, like the one in Figure below , produce salicylic acid to kill bacteria. The same compound is used in many acne products for the same reason. | train | sciq | null |
What do decomposers release once they have broken down the dead organisms? | [
"inorganic molecules",
"unusable molecules",
"essential molecules",
"organic molecules"
] | A | Ecosystems require constant inputs of energy from sunlight or chemicals. Producers use energy and inorganic molecules to make food. Consumers take in food by eating producers or other living things. Decomposers break down dead organisms and other organic wastes and release inorganic molecules back to the environment. | train | sciq | null |
Often determining the strength or intensity of a wave, this term is the distance from the equilibrium point of motion to either its lowest or highest point? | [
"peak",
"frequency",
"density",
"amplitude"
] | D | The amplitude , , is the distance from the equilibrium (or center) point of motion to either its lowest or highest point ( end points ). The amplitude, therefore, is half of the total distance covered by the oscillating object. The amplitude can vary in harmonic motion but is constant in SHM. The amplitude of a wave of... | train | sciq | null |
Which type of muscle fiber can sustain long contractions? | [
"fast fibres",
"slow fibers",
"intense fibers",
"direct fibers"
] | B | train | sciq | null | |
We would genetically be all the same if genes did not have different what? | [
"atoms",
"alleles",
"antigens",
"bases"
] | B | Chromosome, gene, locus and alleles are all related. What is the different between a gene and a locus? Between a gene and an allele? Chromosomes are composed of genes located at specific loci. And genes have different alleles. If genes did not have different alleles, we would genetically be all the same. What does that... | train | sciq | null |
Thylakoid membranes contain molecules of what green pigment used in photosynthesis? | [
"sodium",
"chlorophyll",
"carbonate",
"copper"
] | B | The structure of a chloroplast shows how membrane and molecular architecture helps life processes. A chloroplast consists of thylakoid membranes surrounded by stroma. The thylakoids stack on top of each other, like a stack of pancakes. The thylakoid stacks arrange chlorophyll, accessory pigment molecules, and photosynt... | train | sciq | null |
What is the name for a way of learning that involves reward or punishment? | [
"objective",
"conditioning",
"subjective",
"instinct"
] | B | Conditioning is a way of learning that involves a reward or punishment. Did you ever train a dog to fetch a ball or stick by rewarding it with treats? If you did, you were using conditioning. Another example of conditioning is shown in the video below; the rats have been taught to “play basketball” by being rewarded wi... | train | sciq | null |
What scale measures the total energy released by an earthquake? | [
"moment radiation scale",
"direct magnitude scale",
"moment magnitude scale",
"moment identification scale"
] | C | The moment magnitude scale is the favored method of measuring earthquake magnitudes. It measures the total energy released by an earthquake. Moment magnitude is calculated by two things. One is the length of the fault break. The other is the distance the ground moves along the fault. | train | sciq | null |
All enzymes have an optimal temperature and what? | [
"ph",
"ions",
"weight",
"shapes"
] | A | train | sciq | null | |
When do homologous chromosomes form pairs? | [
"metathesis",
"transcripton",
"mitosis",
"meiosis"
] | D | When homologous chromosomes form pairs during prophase I of meiosis I, crossing-over can occur. Crossing-over is the exchange of genetic material between non-sister chromatids of homologous chromosomes. It results in new combinations of genes on each chromosome. | train | sciq | null |
What forms when the metal sodium gives up an electron to the nonmetal chlorine? | [
"covalent bond",
"van der waals force",
"hydrogen bond",
"an ionic bond"
] | D | An ionic bond forms when the metal sodium gives up an electron to the nonmetal chlorine. | train | sciq | null |
What type of gas is produced by alcoholic fermentation of the glucose in corn or other plants? | [
"ethanol",
"methanol",
"ethyl",
"isopropyl"
] | A | Have your parents ever put corn in the gas tank of their car? They did if they used gas containing ethanol. Ethanol is produced by alcoholic fermentation of the glucose in corn or other plants. This type of fermentation also explains why bread dough rises. Yeasts in bread dough use alcoholic fermentation and produce ca... | train | sciq | null |
What type of transport is vesicle transport considered to be? | [
"catalyst",
"passive transport",
"active transport",
"intercellular transport"
] | C | Some molecules, such as proteins, are too large to pass through the plasma membrane, regardless of their concentration inside and outside the cell. Very large molecules cross the plasma membrane with a different sort of help, called vesicle transport . Vesicle transport requires energy, so it is also a form of active t... | train | sciq | null |
Strong bands of dense, regular connective tissue that connect muscles to bones are called what? | [
"veins",
"membranes",
"tendons",
"cartilage"
] | C | 11.1 | Interactions of Skeletal Muscles, Their Fascicle Arrangement, and Their Lever Systems By the end of this section, you will be able to: • Compare and contrast agonist and antagonist muscles • Describe how fascicles are arranged within a skeletal muscle • Explain the major events of a skeletal muscle contraction w... | train | sciq | null |
Homes and transportation use what percent of all energy in the u.s.? | [
"forty",
"fifteen",
"half (fifty)",
"twenty five"
] | C | About half the energy used in the U. S. is used in homes and for transportation. Businesses, stores, and industry use the other half. | train | sciq | null |
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