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leotides (dNTPs) are added to each tube respectively. Each one of them carries a specific fluorescent label. Chain elongation continues until a fluorescent dNTP is added the growing chain, after which chain termination occurs. Gel electrophoresis is performed and the length of each base is detected by laser scanners wi...
iotic resistance via HGT poses a challenge to medical technology. On the other hand, transformation is often assayed by incorporating an antibiotic-resistance gene in the plasmid to be transferred into the host organism. In natural environments, bacterial and archaebacterial cells become competent (able to transport DN...
n single stranded RNA molecules. Upon infection of a host cell, RNA is used as a template by the virally encoded enzyme, reverse transcriptase, to synthesize DNA. The viral DNA is later transcribed into mRNA and translated into proteins. Some RNA viruses such as the influenza virus never go through a DNA step. The RNA ...
impact of random mutations. Codons that specify the same amino acid typically only differ by one nucleotide. In addition, amino acids with chemically similar side chains are encoded by similar codons. This nuance of the genetic code ensures that a single-nucleotide substitution mutation might either specify the same am...
s of the core enzyme bind to the site. The A–T-rich -10 region facilitates unwinding of the DNA template, and several phosphodiester bonds are made. The transcription initiation phase ends with the production of abortive transcripts, which are polymers of approximately 10 nucleotides that are made and released. Figure ...
Eukaryotic premRNAs undergo extensive processing after transcription but before translation. For clarity, this module’s discussion of transcription and translation in eukaryotes will use the term “mRNAs” to describe only the mature, processed molecules that are ready to be translated. RNA polymerase II is responsible ...
ribes the major share of eukaryotic genes, so this section will focus on how this polymerase accomplishes elongation and termination. Although the enzymatic process of elongation is essentially the same in eukaryotes and prokaryotes, the DNA template is more complex. When eukaryotic cells are not dividing, their genes ...
hout evolution. This is supported by the fact that separate exons often encode separate protein subunits or domains. For the most part, the sequences of introns can be mutated without ultimately affecting the protein product. All of a pre-mRNA’s introns must be completely and precisely removed before protein synthesis....
ding on the organism. However, the general structures and functions of the protein synthesis machinery are comparable from bacteria to human cells. Translation requires the input of an mRNA template, ribosomes, tRNAs, and various enzymatic factors. This OpenStax book is available for free at http://cnx.org/content/col1...
drolysis, which is catalyzed by a separate elongation factor. The amino acid bound to the P-site tRNA is also linked to the growing polypeptide chain. As the ribosome steps across the mRNA, the former P-site tRNA enters the E site, detaches from the amino acid, and is expelled (Figure 15.17). Amazingly, the E. coli tra...
always specifies methionine TATA box conserved promoter sequence in eukaryotes and prokaryotes that helps to establish the initiation site for transcription template strand strand of DNA that specifies the complementary mRNA molecule transcription bubble region of locally unwound DNA that allows for transcription of mR...
NA. b. The flow of information is from protein to RNA in HIV virus, while the influenza virus converts DNA to RNA. c. The flow of information is similar, but nucleic acids are synthesized as a result of translation in HIV and influenza viruses. d. The flow of information is from RNA to protein. This protein is used to ...
ich fraction will not be labeled? a. nucleus b. mitochondrion c. chloroplast d. plasma membrane 48. You sequence a gene of interest and isolate the matching mRNA. You find that the mRNA is considerably shorter than the DNA sequence. Why is that? a. There was an experimental mistake. The mRNA should have the same length...
A 40 second exposure has the following values for an incubation time of 1 to 8: 0.17, 0.09, 0.03, 0.01, 0.01, 0.01, 0.01, 0.01, 0.04, with a standard deviation of .0.06. A 50 second exposure has the following values for an incubation time of 1 to 8: 0.08, 0.04, 0.01, 0.00, 0.00, 0.00, 0.00, 0.00, 0.02 with a standard ...
bed into RNA, which is then translated into proteins. In prokaryotic cells, transcription and translation occur almost simultaneously. In eukaryotic cells, transcription occurs in the nucleus, separate from the translation that occurs in the cytoplasm along ribosomes attached to endoplasmic reticulum. As stated above, ...
d operons for more coordinated regulation of expression. For example, in E. coli, genes responsible for lactose metabolism are located together on the bacterial chromosome. (The operon model includes several components, so when studying how the operon works, it is helpful to refer to a diagram of the model. See Figure ...
operon is off. Why do you think that this is the case? a. The trp operon is inducible and is positively regulated. Therefore it is ON by default whereas the lac operon is repressible and is OFF by default. b. The trp operon synthesizes tryptophan which is essential for the cell and therefore remains ON, whereas the lac...
s type of gene regulation is called epigenetic regulation. Epigenetic means “around genetics.” The changes that occur to the histone proteins and DNA do not alter the nucleotide sequence and are not permanent. Instead, these changes are temporary (although they often persist through multiple rounds of cell division) an...
nd to its upstream sequence. When bound along with the transcription factors, RNA polymerase is phosphorylated. This releases part of the protein from the DNA to activate the transcription initiation complex and places RNA polymerase in the correct orientation to begin transcription; DNA-bending protein brings the enha...
e cytoplasm longer and more protein can be translated. This rate of decay is referred to as the RNA stability. If the RNA is stable, it will be detected for longer periods of time in the cytoplasm. Binding of proteins to the RNA can influence its stability. Proteins, called RNA-binding proteins, or RBPs, can bind to th...
ess can affect protein production. 3.B.2 A variety of intercellular and intracellular signal transmissions mediate gene expression. Science Practice 1.4 The student can use representations and models to analyze situations or solve problems qualitatively and quantitatively. Learning Objective 3.23 The student can use re...
stead of cell death. Clearly, the expression of the wrong protein dramatically alters cell function and contributes to the development of cancer. New Drugs to Combat Cancer: Targeted Therapies Scientists are using what is known about the regulation of gene expression in disease states, including cancer, to develop new ...
, general transcription factors, such as TFIID, TFIIH, and others, must first bind to the TATA box and recruit RNA polymerase to that location. The binding of additional regulatory transcription factors to cis-acting elements will either increase or prevent transcription. In addition to promoter sequences, enhancer reg...
gned to switch silenced genes back on in cancer cells would result in what? CRITICAL THINKING QUESTIONS 24. Which best distinguishes prokaryotic and eukaryotic cells? a. Prokaryotes possess a nucleus whereas eukaryotes do not, but eukaryotes show greater compartmentalization that allows for greater regulation of gene e...
prokaryotes d. no effect in eukaryotes, and decreased mRNA stability in prokaryotes 43. Describe two ways in which gene regulation differs and two ways in which it is similar in prokaryotes and eukaryotes. a. Prokaryotes show co-transcriptional translation whereas eukaryotes perform transcription prior to translation;...
ten genetically modified foods and are familiar with how DNA analysis is used to solve crimes. Manipulation of DNA by humans has resulted in bacteria that can protect plants from insect pests and restore ecosystems. Biotechnologies also have been used to produce insulin, hormones, antibiotics, and medicine that dissolv...
y applying DNA nucleotides to the mRNA. This process is called reverse transcription. This requires the presence of an enzyme called reverse transcriptase. After the cDNA is made, regular PCR can be used to amplify it. This OpenStax book is available for free at http://cnx.org/content/col12078/1.6 Chapter 17 \| Biotechn...
re, if the haploid nucleus of an egg cell is replaced with a diploid nucleus from the cell of any individual of the same species (called a donor), it will become a zygote that is genetically identical to the donor. Somatic cell nuclear transfer is the technique of transferring a diploid nucleus into an enucleated egg. ...
nmental conditions. Many plants, such as walnuts, grapes, nut trees, and beets, are affected by A. tumefaciens. The artificial introduction of DNA into plant cells is more challenging than in animal cells because of the thick plant cell wall. Researchers used the natural transfer of DNA from Agrobacterium to a plant ho...
izes specific sequences in the DNA to generate a series of DNA fragments, which are then analyzed by gel electrophoresis. The DNA of every individual will give rise to a unique pattern of bands when cut with a particular set of restriction endonucleases; this is sometimes referred to as an individual’s DNA “fingerprint...
7.13 Frederick Sanger's dideoxy chain termination method is illustrated. Using dideoxynucleotides, the DNA fragment can be terminated at different points. The DNA is separated on the basis of size, and these bands, based on the size of the fragments, can be read. Early Strategies: Shotgun Sequencing and Pair-Wise End S...
genomics. The most commonly known application of genomics is to understand and find cures for diseases. Predicting Disease Risk at the Individual Level Predicting the risk of disease involves screening currently healthy individuals by genome analysis at the individual level. Intervention with lifestyle changes and dru...
ons, which complicate the study of proteomes. Although the genome provides a blueprint, the final architecture depends on several factors that can change the progression of events that generate the proteome. Metabolomics is related to genomics and proteomics. Metabolomics involves the study of small molecule metabolite...
enes polymerase chain reaction (PCR) technique used to amplify DNA probe small DNA fragment used to determine if the complementary sequence is present in a DNA sample protease enzyme that breaks down proteins protein signature set of uniquely expressed proteins in the diseased state proteome entire set of proteins prod...
ate new hybrid strains b. c. d. improve disease resistance improve yield improve yield and resistance and generate hybrids 19. What are the uses of metagenomics? a. b. identification of biofuels testing for multiple drug susceptibility in a population c. use in increasing agricultural yields d. identifying new species ...
ng genomics. d. The study of genes is incomplete without the study of their respective proteins and thus they complement each other. 42. How could a proteomic map of the human genome help find a cure for cancer? a. A genetic map could help in identifying genes that could counteract the cause of cancer. b. Metabolomics ...
ost-transcriptional strategies target the mRNA product of a gene. One such strategy uses the conserved genes that encode RNA interference (RNAi) proteins for the regulation of levels of mRNA transcription. Some viral RNA is double stranded (dsRNA). A cell responds to the presence of double-stranded RNA by the attachmen...
Science Practice 7.1 The student can connect phenomena and models across spatial and temporal scales. Learning Objective Essential Knowledge 1.26 The student is able to evaluate given data sets that illustrate evolution as an ongoing processes. 1.C.3 Populations of organisms continue to evolve. Science Practice 7.1 The...
culture. Plant and microbial species, in particular, can reveal new medicinal and nutritive knowledge. Other organisms can play key roles in ecosystems or be considered rare and in need of protection. When discovered, these important species can be used as evidence for environmental regulations and laws. Processes and ...
the time the adult or juvenile form is reached. For example, all vertebrate embryos, including humans, exhibit gill slits and tails at some point in their early development. These disappear in the adults of terrestrial groups but are maintained in adult forms of aquatic groups such as fish and some amphibians. Great ap...
in an environment” are quite common, but such statements can lead to two types of misunderstandings. First, the statement must not be understood to mean that individual organisms evolve. The statement is shorthand for “a population evolves in response to a changing environment.” However, a second misunderstanding may ...
enotype, when expressed as a phenotype, provides a variation that can be subject to natural selection. 3.C.1 Changes in genotype can result in changes in phenotype. 7.2 The student can connect concepts in and across domain(s) to generalize or extrapolate in and/or across enduring understandings and/or big ideas. 3.26 T...
h different climates and ecosystems. The owl is an example of allopatric speciation. (credit "northern spotted owl": modification of work by John and Karen Hollingsworth; credit "Mexican spotted owl": modification of work by Bill Radke) Additionally, scientists have found that the farther the distance between two group...
cters may affect the reproductive isolation (the inability to interbreed) of the two populations. Reproductive isolation can take place in a variety of ways. Scientists organize them into two groups: prezygotic barriers and postzygotic barriers. Recall that a zygote is a fertilized egg: the first cell of the developmen...
used because the low success of the hybrids reinforces the original speciation. If the hybrids are as fit or more fit than the parents, the two species may fuse back into one species (Figure 18.25). Scientists have also observed that sometimes two species will remain separate but also continue to interact to produce s...
ion? This OpenStax book is available for free at http://cnx.org/content/col12078/1.6 Chapter 18 \| Evolution and Origin of Species 749 a. a trait or behavior that aids an organism’s survival and reproduction 9. Which statement best describes the relationship between the theory of evolution and the origin of life? b. a h...
of organisms who share a similar environment 28. Why do scientists consider vestigial structures evidence for evolution? a. Vestigial structures are the result of convergent evolution, so they are good evidence that natural selection act similarly in similar environmental conditions. b. Vestigial structures are the res...
n. Conditions change again, the dark form is vulnerable. It develops an adaptation that shields it from predation. 45. Given your understanding of evolutionary theory and the relationship between evolution and the genetic makeup of populations, which statement is false? a. Homologous characteristics that have evolved m...
environment. d. The whale flipper is a vestigial structure. 53. Biogeography is the study of biological species as they relate to geographical space and geological time. The fossil record shows that dinosaurs originated about 200 to 250 million years ago. Would you expect the geographic distribution of early dinosaur ...
scribe a plan for collecting two kinds of data that could provide a direct answer to the question: do the populations growing above 2,500 meters and the populations growing below 2,300 meters represent a single species? 61. Populations of a nocturnal toad live along a long river. On the other side of a band of territor...
ssil record. For the case of punctuated equilibrium, the fossil record would show a steady progression of distinct forms. 70. Until recently, these three species of short-tailed pythons, Python curtus, Python brongersmai (middle), and Python breitensteini were considered one species. However, due to the different locat...
upon which metabolism is based. This alternative is the basis for what is referred to as the metabolism-first hypothesis. • The catalytic properties of the ribosome reflect the self-catalytic polymerization of nucleotides with sequential structures conserved in modern DNA, the catalytic properties conserved in proteins...
r effect. In Population Genetics, we will explore how natural selection, random drift, and founder effects can lead to significant changes in the genome of a population. [2] Hardy–Weinberg equilibrium reflects a state of constancy in a population’s gene pool. In other words, allele frequencies remain stable from genera...
quencies are inherently stable—unless some kind of evolutionary force is acting upon the population, neither the allele nor the genotypic frequencies would change. The Hardy–Weinberg principle assumes conditions with no mutations, migration, emigration, or selective pressure for or against genotype, plus an infinite po...
nce Practice Learning Objective Essential Knowledge Science Practice Learning Objective 1.A.1 Natural selection is a major mechanism of evolution. 2.2 The student can apply mathematical routines to quantities that describe natural phenomena. 1.2 The student is able to evaluate evidence provided by data to qualitatively...
on of random sampling and genetic drift in action. Describe an example of genetic drift. a. b. Immigration of new individuals can cause genetic drift. For example, if several white rabbits migrate into a population of mostly brown rabbits, the allele for white fur will increase within the population. Introduction of ne...
itudinal cline. Alternatively, flowering plants tend to bloom at different times depending on where they are along the slope of a mountain, known as an altitudinal cline. If there is gene flow between the populations, the individuals will likely show gradual differences in phenotype along the cline. Restricted gene flo...
an sneak in for furtive copulations with the females in an alpha male’s territory. In this case, both the alpha males and the “sneaking” males will be selected for, but medium-sized males, which can’t overtake the alpha males and are too big to sneak copulations, are selected against. Diversifying selection can also oc...
ion; it does not create anything from scratch. Thus, it is limited by a population’s existing genetic variance and whatever new alleles arise through mutation and gene flow. Natural selection is also limited because it works at the level of individuals, not alleles, and some alleles are linked due to their physical pro...
pulation through which of the following mechanisms? over time b. The strong arms of a gorilla are the result of its parents constantly climbing, lifting and fighting. c. Lack of resources led to the death of three of four fox cubs. d. The founder effect is when a few individuals in a population are separated from the o...
seal due to the loss of some alleles. c. The founder effect is when only a few males within a population are selected by females to reproduce, generating an allele frequency which is different from the original population. An example of the founder effect is the reproductive pattern of mountain gorillas. Mountain goril...
antage is a condition in which heterozygotes are favored by natural selection. How would the value of 2pq likely change if the population was undergoing heterozygote advantage? a. b. c. d. It would remain in equilibrium because the value of p and q would remain the same. It would remain in equilibrium because the value...
d speciation of bioluminescent lineages, including the mechanism of speciation. 44. Chapter 19 \| The Evolution of Populations 805 Figure 19.15 A biologist is using a simulation to model populations of African hornbills (Bycanistes spp. and Ceratogymna spp.), a keystone species of the savanna. Populations of the birds a...
nd serves to illustrate where scientists have not definitively determined all of the relationships. It is important to note that although sister taxa and polytomy do share an ancestor, it does not mean that the groups of organisms split or evolved from each other. Organisms in two taxa may have split apart at a specifi...
6 Chapter 20 \| Phylogenies and the History of Life 815 Visit this website (http://openstaxcollege.org/l/classify_life) to classify three organisms—bear, orchid, and sea cucumber—from kingdom to species. To launch the game, under Classifying Life, click the picture of the bear or the Launch Interactive button. Using the...
that are based on evolution. For example, the bones in the wings of bats and birds have homologous structures (Figure 20.7). 818 Chapter 20 \| Phylogenies and the History of Life Figure 20.7 Bat and bird wings are homologous structures, indicating that bats and birds share a common evolutionary past. (credit a: modifica...
Life Figure 20.11 All the organisms within a clade stem from a single point on the tree. A clade may contain multiple groups, as in the case of animals, fungi and plants, or a single group, as in the case of flagellates. Groups that diverge at a different branch point, or that do not include all groups in a single bra...
t is one of the most dynamic fields of study in all of biology. Over the last several decades, new research has challenged scientists’ ideas about how organisms are related. New models of these relationships have been proposed for consideration by the scientific community. Many phylogenetic trees have been shown as mod...
free at http://cnx.org/content/col12078/1.6 Chapter 20 \| Phylogenies and the History of Life 831 Barbara McClintock (1902–1992) discovered transposons while working on maize genetics. Figure 20.14 What does the Eukaryote-first hypothesis suggest? a. b. c. d. that mitochondria were first established in a prokaryotic hos...
cation system; the first part of the binomial scientific name horizontal gene transfer (HGT) (also, lateral gene transfer) transfer of genes between unrelated species kingdom division of domain in the taxonomic classification system maximum parsimony applying the simplest, most obvious way with the least number of step...
e d. web of life evidence. b. The model is erroneously based on many analogous traits, which have no basis in evolutionary relationships. c. The model cannot be experimentally verified. d. The model does not consider the possibility that genes could be transferred between unrelated species. 17. Compare three different ...
n your answer. Chapter 20 \| Phylogenies and the History of Life 843 a. Analogous-Dolphins are mammals and fish are not, thus their evolutionary paths are quite separate. They have similar body shapes because of their similar environment. b. Analogous-Dolphins and fish are both vertebrates, thus they share an evolutiona...
te dehydrogenase whose roles vary within an organism: LDH-A, -B, and -C. The question arises as to the origins of each. The cladogram on the right (after S. Tsuji et al., Proc Natl Acad Sci 1994) displays a proposed relatedness of variations in LDHs over many species. B. Based on these data, describe the differences be...
use of these technologies has allowed for the discovery of many viruses of all types of living organisms. They were initially grouped by shared morphology. Later, groups of viruses were classified by the type of nucleic acid they contained, DNA or RNA, and whether their nucleic acid was single- or double-stranded. More...
thod today is called the Baltimore classification scheme and is based on how messenger RNA (mRNA) is generated in each particular type of virus. Past Systems of Classification Viruses are classified in several ways: by factors such as their core content (Table 21.1 and Figure 21.3), the structure of their capsids, and ...
ytic and lysogenic cycles. Animal viruses cause a variety of infections, for example, hepatitis C, herpes, HPV, colds, and flu. Occasionally, viruses can “hide” and remain latent (dormant) in cells such as nerve or liver cells for months, or even years; for example, the varicellazoster virus that causes chickenpox in c...
alled a prophage. An example of a lysogenic bacteriophage is the λ (lambda) virus, which also infects 862 Chapter 21 \| Viruses the E. coli bacterium. Viruses that infect plant or animal cells may also undergo infections where they are not producing virions for long periods. An example is the animal herpesviruses, inclu...
al growth patterns Malformed stems, leaves, or fruit Discoloration Yellow, red, or black lines, or rings in stems, leaves, or fruit Table 21.4 Plant viruses can seriously disrupt crop growth and development, significantly affecting our food supply. They are responsible for poor crop quality and quantity globally, and c...
ections, although its mechanism of action against certain viruses remains unclear. Figure 21.16 (a) Oseltamivir inhibits a viral enzyme called neuraminidase (NA) found in the influenza viral envelope. (b) Neuraminidase cleaves the connection between viral hemagglutinin (HA), also found in the viral envelope, and glycop...
tissue, visualized using light microscopy, shows the vacuoles that give it a spongy texture, typical of transmissible spongiform encephalopathies. (credit b: modification of work by Dr. Al Jenny, USDA APHIS; scale-bar data from Matt Russell) This OpenStax book is available for free at http://cnx.org/content/col12078/1...
pact on the agriculture industry. REVIEW QUESTIONS 1. Viruses were first discovered after the development of the porcelain filter, called the Chamberland-Pasteur filter. How did the porcelain filter enable scientists to discover viruses? a. The porcelain filter removed diseases from a liquid sample. b. The porcelain fi...
ay, the viruses in each group _____. more virions as the reproductive cycle of viruses undergoing lysogeny is much faster than the reproductive cycle of viruses following lytic cycle. c. The lysogenic cycle can theoretically produce more virions as the viral genome is incorporated into the host cell’s genome replicatin...
or why not: “The lysogenic cycle allows viruses to preserve their genome during unfavorable conditions.” This OpenStax book is available for free at http://cnx.org/content/col12078/1.6 Chapter 21 \| Viruses 885 a. True. Because when the host cell experiences unfavorable conditions, it stops dividing and stays in the sam...
is section, you will explore the following questions: • What is the evolutionary history of prokaryotes? • What are distinguishing features of extremophiles? • Why is it difficult to culture prokaryotes for study purposes? Connection for AP® Courses In the recent past, scientists grouped living organisms into five king...
zone effectively absorbs the ultraviolet light that would otherwise cause lethal mutations in DNA. Ultimately, the increase in O2 concentrations allowed the evolution of other life forms. This OpenStax book is available for free at http://cnx.org/content/col12078/1.6 Chapter 22 \| Prokaryotes: Bacteria and Archaea 893 F...
to environmental stressors by entering a dormant state that allows their survival. The criteria for entering into the VBNC state are not completely understood. In a process called resuscitation, the prokaryote can go back to “normal” life when environmental conditions improve. Is the VBNC state an unusual way of livin...
nx.org/content/col12078/1.6 Chapter 22 \| Prokaryotes: Bacteria and Archaea 901 Figure 22.12 Phylum Proteobacteria is one of up to 52 bacteria phyla. Proteobacteria is further subdivided into five classes, Alpha through Epsilon. (credit “Rickettsia rickettsia”: modification of work by CDC; credit “Spirillum minus”: modi...
rokaryotes look like tiny bubbles in rock. Some scientists turn to genetics and to the principle of the molecular clock, which holds that the more recently two species have diverged, the more similar their genes (and thus proteins) will be. Conversely, species that diverged long ago will have more genes that are dissim...
ules from carbon dioxide. The table below (Table 22.3) summarizes carbon and energy sources in prokaryotes. Carbon and Energy Sources in Prokaryotes Energy Sources Carbon Sources Light Phototrophs Chemicals Chemotrophs Carbon dioxide Organic compounds Autotrophs Heterotrophs Organic chemicals Inorganic chemicals Chemo-...
most memorable pandemics led to the decline of cities and nations. In the 21st century, infectious diseases remain among the leading causes of death worldwide, despite advances made in medical research and treatments in recent decades. A disease spreads when the pathogen that causes it is passed from one person to ano...
the same bacteria when they are free-living or planktonic. An antibiotic dose that large would harm the patient; therefore, scientists are working on new ways to get rid of biofilms. Antibiotics: Are We Facing a Crisis? The word antibiotic comes from the Greek anti meaning “against” and bios meaning “life.” An antibio...
become resistant to the same antibiotic? Why has this become a major global problem? 22.5 \| Beneficial Prokaryotes In this section, you will explore the following questions: • What is the need for nitrogen fixation and how is it accomplished? • What are examples of foods for which prokaryotes are used in processing? •...
nts in oil can be degraded within one year of the spill. Other oil fractions containing aromatic and highly branched hydrocarbon chains are more difficult to remove and remain in the environment for longer periods of time. Figure 22.28 (a) Cleaning up oil after the Valdez spill in Alaska, workers hosed oil from beaches...
but they may have pseudopeptidoglycan, polysaccharides, glycoproteins, or protein-based cell walls. Bacteria can be divided into two major groups: Gram positive and Gram negative, based on the Gram stain reaction. Gram-positive organisms have a thick cell wall, together with teichoic acids. Gram-negative organisms hav...
chemotrophs d. heterotrophs 18. What uses organic compounds as both an energy source and as a carbon source? a. chemolithotrophs b. photoautotrophs c. photoheterotrophs d. chemoorganotrophs 19. A primary role of many prokaryotes in the carbon cycle is that of ____. 928 Chapter 22 \| Prokaryotes: Bacteria and Archaea a....
ellum, and pili but in some instances different chemical compounds make them. Cell walls of Bacteria contain peptidoglycan while Archaea do not. Bacteria contain 70S ribosomes while Archaea contain 80S ribosomes. c. Typical cells in Archaea and Bacteria contain a cell wall, nuclear membranes, nucleoid region and often ...
ted to biofilms changed over time? Explain. a. Yes, better sterilization and canning procedures have reduced the incidence of botulism. Most cases of foodborne illness now are related to small-scale food production. b. No, better sterilization and canning procedures have reduced the incidence of botulism. Most cases of...
on this discovery to better understand the evolution of mechanisms related to the ability to capture, store, and use free energy in prokaryotes, which question would you pose to answer? a. Have metabolic pathways evolved separately in Bacteria and Archaea? b. Should all methanogens be classed as Archaea in evolutionary...
d. pathogenic 76. If you suddenly and dramatically changed your diet, how might this affect the diversity of prokaryotic species that live in your intestine? a. The diversity would not get altered and would remain the same. b. Species abundance and relative distribution may increase. c. Species abundance and relative d...
l profile of methane and oxygen below the surface of a rice paddy are shown in the graph below (Lee et al., Front. Microbiol, 25, 2015). Also shown are estimates of the relative abundance of all genera of methanotrophs (red line) and methanogens (blue line) as a function of depth. Rice paddies are the largest contribut...

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