question stringlengths 68 502 | answer stringclasses 4
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Question: The nitrogen that enters living systems by nitrogen fixation is successively converted from organic nitrogen back into nitrogen gas by what?
Options:
A. algae
B. pollen
C. bacteria
D. viruses | C |
Question: What term describes the amount of solute in a given amount of solution?
Options:
A. density
B. cloudiness
C. temperature
D. concentration | D |
Question: Which process helps absorptive protists absorb food molecules across their cell membranes?
Options:
A. activation
B. metabolism
C. secretion
D. diffusion | D |
Question: When matter recycles and changes state what does it gain or lose by doing so?
Options:
A. volume
B. fuel
C. energy
D. density | C |
Question: Where does oxygen enter the blood?
Options:
A. in the lungs
B. in the liver
C. in the veins
D. in the heart | A |
Question: What kind of compounds change color when bases come into contact with them, so they can be used to detect bases?
Options:
A. parameters
B. liquid
C. metals
D. indicators | D |
Question: Concentric circles that spread out through the water around the droplets are actually types of what moving through the water?
Options:
A. winds
B. troughs
C. lines
D. waves | D |
Question: The smallest units of matter that retain the unique properties of an element are known as what?
Options:
A. atoms
B. protons
C. molecules
D. neutrons | A |
Question: What is a process that changes some chemical substances into other chemical substances?
Options:
A. spontaneous mutation
B. a chemical reaction
C. a bio reaction
D. cellular respiration | B |
Question: What type of lens and mirrors have a negative focal length?
Options:
A. convexing
B. converging
C. subverging
D. diverging | D |
Question: What is the formation of organs from the germ layers called?
Options:
A. biosynthesis
B. synaptogenesis
C. organogenesis
D. photosynthesis | C |
Question: What must two nuclei do for fusion to occur?
Options:
A. collide
B. repel each other
C. explode
D. melt | A |
Question: What determines the ability of soil particles to bind many nutrients?
Options:
A. layer charges
B. surface pulses
C. surface charges
D. currents charges | C |
Question: Enthalpy is a measure of the total energy of what kind of system?
Options:
A. macroscopic
B. hypodermic
C. planetary
D. thermodynamic | D |
Question: In eukaryotes, the new mrna is not yet ready for translation. it must go through more processing before it leaves where?
Options:
A. protons
B. molecules
C. Electrons
D. nucleus | D |
Question: What term describes the splitting of the nucleus of an atom into two smaller nuclei?
Options:
A. nuclear fission
B. critical fission
C. nuclean fusion
D. atomic reaction | A |
Question: What type of contamination causes almost 90% of diarrheal disease worldwide?
Options:
A. ground contamination
B. water supply contamination
C. air contamination
D. food contamination | B |
Question: Why is respiratory acidosis considered to be problematic?
Options:
A. excess co2 in blood
B. causes acid stomach
C. excess oxygen in blood
D. causes suffocation | A |
Question: When light strikes rhodopsin, the g-protein transducin is activated, which in turn activates what?
Options:
A. hydrolysis
B. aldosterone
C. photosynthesis
D. phosphodiesterase | D |
Question: In what stage of photosynthesis does the calvin cycle occur?
Options:
A. second
B. fourth
C. third
D. first | A |
Question: All of the planets rotate on their axes in the same direction that they move around the sun, except for which one?
Options:
A. Saturn
B. Jupiter
C. venus
D. uranus | D |
Question: What is the process by which organisms change in small ways over time?
Options:
A. microevolution
B. adaptation
C. spontaneous mutation
D. natural selection | A |
Question: What regulates the cell cycle only when they are tightly bound to cdks?
Options:
A. hormones
B. subclades
C. cyclins
D. kinases | C |
Question: Einstein developed a theory about how electromagnetic radiation can behave as both a wave and what else?
Options:
A. bacteria
B. sound
C. particle
D. energy | C |
Question: What type of proteins are only temporarily associated with the membrane?
Options:
A. peripheral membrane proteins
B. peripheral oxidation proteins
C. visual membrane proteins
D. sensitive rod proteins | A |
Question: Which organisms break down either organic or inorganic molecules to supply energy for the cell?
Options:
A. photoreactive organisms
B. spicule organisms
C. asexual organisms
D. chemotrophic organisms | D |
Question: What are the things moving under the earth's mantle that move the crust?
Options:
A. crystals
B. ridges
C. lava channels
D. plates | D |
Question: Although they look like big rocks, what structures that serve as habitats for many different types of ocean life are actually alive?
Options:
A. southern reefs
B. coral reefs
C. new forming reefs
D. natural reefs | B |
Question: What type of reactions are chemical reactions that release energy?
Options:
A. ozonic reactions
B. exothermic reactions
C. biochemical reactions
D. sulfuric reactions | B |
Question: Fossil fuels and coal are examples of what kind of resources?
Options:
A. valuable
B. reusable
C. renewable
D. nonrenewable | D |
Question: What type of compound contains atoms of two or more different elements in its ring structure?
Options:
A. aldehyde
B. heterocyclic
C. polymer
D. hydrocarbon | B |
Question: What is formed when atoms of different elements combine in a chemical reaction?
Options:
A. toxins
B. crystals
C. dust
D. compounds | D |
Question: What type of electricity is formed when a negative charge builds up and are transferred?
Options:
A. direct current
B. neutron energy
C. alternating current
D. static electricity | D |
Question: What important liquid is stored throughout the earth in the oceans, underground, and in ice?
Options:
A. water
B. oil
C. air
D. lava | A |
Question: What results when a warm air mass runs into a cold air mass?
Options:
A. dry front
B. warm front
C. rough front
D. cool front | B |
Question: Which type of double bond has a sigma bond and a pi bond?
Options:
A. dioxide - oxygen bond
B. sodium - oxygen bond
C. Covalent Bonds
D. carbon-oxygen bond | D |
Question: Has the average annual temperature on earth been rising or falling for the past 100 years?
Options:
A. fluctuating
B. falling
C. rising
D. unchanged | C |
Question: The majoirty of modern gymnosperms belong to what group, which includes pine trees?
Options:
A. Pinophytes
B. clusters
C. stems
D. conifers | D |
Question: A circuit must be what in order for electric devices such as light bulbs to work?
Options:
A. closed
B. open
C. cyclical
D. down | A |
Question: What type of radiation from the sun reaches earth across space striking everything on earth’s surface?
Options:
A. electromagnetic
B. static
C. particle
D. seismic | A |
Question: What happens if a catalyst runs out?
Options:
A. variety increases
B. variety slows
C. reaction increases
D. reaction slows | D |
Question: What type of mammals are humans?
Options:
A. respiratory mammals
B. somatic mammals
C. marsupial mammals
D. placental mammals | D |
Question: The shape of the path of an object undergoing projectile motion in two dimensions is a what?
Options:
A. parabola
B. orbit
C. radius
D. circle | A |
Question: The earliest cells were called what?
Options:
A. microcytes
B. carbohydrates
C. eukaryotes
D. prokaryotes | D |
Question: Protists are the simplest of what?
Options:
A. plants
B. prokaryotes
C. eukaryotes
D. fungi | C |
Question: The measure of magnetic fields is named after a serbian physicist. what is his name?
Options:
A. Carl Sagan
B. nikola tesla
C. Albert Einstein
D. Niels Bohr | B |
Question: Radon (rn) is a radioactive gas formed by the decay of naturally occurring uranium in rocks such as granite. it tends to collect in the basements of houses and poses a significant health risk if present in indoor air. many states now require that houses be tested for radon before they are what?
Options:
A. se... | C |
Question: What state of matter takes neither the shape nor the volume of its container?
Options:
A. solid
B. hot
C. liquid
D. gas | A |
Question: Force times distance is the equation for what?
Options:
A. power
B. gravity
C. speed
D. work | D |
Question: What is the name for a series of changes in the reproductive system of mature females that repeats every month on average?
Options:
A. menstrual cycle
B. puberty
C. urinary cycle
D. periodic table | A |
Question: What is the name of the iron-containing oxygen-transport protein in the red blood cells of all vertebrates?
Options:
A. platelet
B. plasma
C. ferric acid
D. hemoglobin | D |
Question: What is the active ingredient in household bleach?
Options:
A. oxygen
B. iodine
C. chlorine
D. magnesium | C |
Question: What are the membrane-bound organelles that are usually larger than vesicles and can have secretory, excretory, and storage functions?
Options:
A. nucleolus
B. tubules
C. vacuoles
D. ribosomes | C |
Question: What broad category of animals is primarily ectothermic and covered with scales that facilitate swimming?
Options:
A. armadillo
B. turtles
C. fish
D. deer | C |
Question: What has two chains of nucleotides, one more than rna?
Options:
A. gna
B. mna
C. fna
D. dna | D |
Question: The axon terminates on muscle fibers at the neuromuscular junction. acetylcholine is released at this specialized synapse, which causes the muscle action potential to begin, following a large potential known as an end plate potential. when the lower motor neuron excites the muscle fiber, it contracts. all of ... | B |
Question: Misconceptions about what theory contribute to the controversy that still surrounds this fundamental principle of biology?
Options:
A. theory of evolution
B. darwin on evolution
C. brain of evolution
D. cycle of evolution | A |
Question: What device is used to stop a current in a circuit?
Options:
A. a valve
B. a switch
C. a mirror
D. a signal | B |
Question: What oily substance prevents the hair and skin of living things from drying out?
Options:
A. pancreatic enzymes
B. pus
C. sebum
D. progesterone | C |
Question: What two types of communication do both humans and birds use primarily?
Options:
A. material and auditory
B. visual and auditory
C. interaction and auditory
D. sensual and auditory | B |
Question: Eggs are produced in what organs and, upon fertilization, develop in what other organ?
Options:
A. uterus, vagina
B. ovaries, uterus
C. fallopian tubes, ovaries
D. cervix, ovaries | B |
Question: The first line of defense includes mechanical, chemical, and which other barrier?
Options:
A. biological
B. independent
C. physical
D. surgical | A |
Question: What is another term for nearsightedness?
Options:
A. astigmatism
B. anemia
C. hypoxia
D. myopia | D |
Question: Because all animals require an external source of what, they are called heterotrophic?
Options:
A. energy
B. fuel
C. water
D. food | D |
Question: What causes blue litmus to turn red?
Options:
A. oxygen
B. carbon
C. acid
D. base | C |
Question: When fossil fuel is burned the chemical energy is converted into what?
Options:
A. atmospheric energy
B. kinetic energy
C. thermal energy
D. natural energy | C |
Question: What two activities are especially important when a number of local populations are linked, forming a metapopulation?
Options:
A. immigration and emigration
B. immigration and family reunions
C. flow and emigration
D. family reunions and emigration | A |
Question: What is the physical environment in which a species lives and to which it has adapted?
Options:
A. habitat
B. farmland
C. ecosystem
D. land mass | A |
Question: What kind of tests may detect substances associated with particular disorders?
Options:
A. biochemical
B. electrical
C. hormonal
D. genetic | A |
Question: Scientists think the solar system formed from a big cloud of gas and dust called what?
Options:
A. nebula
B. supernova
C. comet
D. Oort cloud | A |
Question: What are the largest phylum of the animal kingdom?
Options:
A. Pycnogonida
B. Crustacea
C. Chelicerata
D. arthropods | D |
Question: What is the name for a material that prevents the transfer of heat energy?
Options:
A. thermal insulator
B. structure insulator
C. thermal condenser
D. physical insulator | A |
Question: What is a rock exposed to if it's undergoing metamorphism?
Options:
A. gravity and precipitation
B. time and energy
C. heat and pressure
D. humidity and pressure | C |
Question: Water infiltrates the ground because soil and rock may have air spaces between the grains. these pores, or tiny holes, result in the rock's what?
Options:
A. porosity
B. shine
C. energy
D. sheen | A |
Question: Work is done only if a force is exerted in the direction of what?
Options:
A. wind
B. gravity
C. motion
D. north | C |
Question: What is the smallest independently functioning unit of a living organism?
Options:
A. molecule
B. proteins
C. atom
D. cell | D |
Question: All animals have specialized types of what basic structures, which can then do different jobs?
Options:
A. cells
B. muscles
C. atoms
D. proteins | A |
Question: What term describes the number of items in a given area or volume?
Options:
A. fraction
B. alkalinity
C. density
D. concentration | D |
Question: Birds are known for flying south in the winter to avoid what?
Options:
A. solar radiation
B. rain
C. hurricanes
D. cold weather | D |
Question: The root system is usually anchored by one main root developed from what?
Options:
A. embryonic radicle
B. organisms radicle
C. sperm radicle
D. nuclei radicle | A |
Question: What type of learning is done from past experiences and reasoning?
Options:
A. transformation learning
B. insight learning
C. consequence learning
D. rational learning | B |
Question: Where is the pituitary gland?
Options:
A. thyroid
B. heart
C. lung
D. brain | D |
Question: Which fungi eaten by people all over the world?
Options:
A. fruits
B. legumes
C. mushrooms
D. algae | C |
Question: The outermost layer of the leaf is the epidermis; it is present on both sides of the leaf and is called the upper and lower epidermis, respectively. botanists call the upper side the adaxial surface (or adaxis) and the lower side this?
Options:
A. posterior surface
B. abaxial surface (or abaxis)
C. dorsal sur... | B |
Question: A small quake preceding a large quake is called what?
Options:
A. foreshock
B. aftershock
C. warning shock
D. preshock | A |
Question: What do winter storms develop from at higher latitudes?
Options:
A. temperatures
B. humidity
C. cyclones
D. clouds | C |
Question: What is the only substance on earth that is present in all three states of matter?
Options:
A. mercury
B. water
C. air
D. carbon | B |
Question: What is essential for forming new genes?
Options:
A. enough chromosomes
B. chromosome deversity
C. large mutations
D. enough mutations | C |
Question: What is fluid friction with air called?
Options:
A. wind resistance
B. gravity
C. air resistance
D. buoyancy | C |
Question: Plants produce their own sugars and other food molecules through what process?
Options:
A. spermatogenesis
B. glycolysis
C. photosynthesis
D. hydrogenesis | C |
Question: What do fission reactors use to slow down the neutrons?
Options:
A. control
B. inertia
C. brake
D. moderator | D |
Question: What term is used to describe an unusual sound coming from the heart that is caused by the turbulent flow of blood?
Options:
A. murmur
B. music
C. whisper
D. garble | A |
Question: Carbon atoms are bonded to as many hydrogen atoms as possible in what type of fatty acids?
Options:
A. super
B. unsaturated
C. oily
D. saturated | D |
Question: What kind of mouthparts do aphids have?
Options:
A. siphoning mouthparts
B. sponging mouthparts
C. piercing-sucking mouthparts
D. chewing mouthparts | C |
Question: Sounds, chemicals, and visual cues are examples of what between animals?
Options:
A. migration
B. communication
C. circulation
D. procreation | B |
Question: What is pressure times area equal to?
Options:
A. mass
B. density
C. force
D. volume | C |
Question: What part of the kangaroo helps it balance when it leaps as well as when it sits?
Options:
A. the pouch
B. large feet
C. the tail
D. the spine | C |
Question: What is the evolutionary history of a group of related organisms called?
Options:
A. ancestry
B. phylogeny
C. lineage
D. superfamily | B |
Question: What are specialized cells in the brain that monitor the concentration of solutes in the blood called?
Options:
A. ionconcentrate
B. sporozoans
C. osmoreceptors
D. staurikosaurus | C |
Question: Bones consist of four types of tissue, compact bone, spongy bone, bone marrow, and what?
Options:
A. collagen
B. periosteum
C. epithelium
D. plasma | B |
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