At present, the most accurate indicator of evolutionary relatedness among organisms is the
A. size of the periplasmic space.
B. sequence of the ribosomal small subunit RNA.
C. size of the bacterial chromosome.
D. similarities of cell membrane proteins.
E. size of the ribosomes.
Answer: B
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Muscle fatigue is often accompanied by muscle pain. What is the most likely explanation for this pain?
A. the myofibrils being torn apart B. decreased levels of glycogen in the muscle fibers C. increased levels of Pi in the muscle fibers D. decreased levels of ATP in the muscle fibers E. decreased pH in the muscle fibers Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you know about muscle fatigue? What other information is related to the question? Choose Answer · Given what you now know, what information is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
The essence of meiosis is that
a. gametes are formed that receive one copy of each member of each pair of homologous chromosomes. b. gametes are formed that are diploid. c. each gamete receives one member of each pair of homologous chromosomes. d. gametes are formed that are haploid. e. each gamete receives one member of each pair of homologous chromosomes, and gametes are formed that are haploid.
What would be the ultimate effect on an ecosystem if decomposers were eliminated?
a. The consumers would have to eat twice as much. b. The rate of photosynthesis would increase. c. All life would eventually cease as nutrients would no longer be available. d. Energy flow between producers and consumers would increase. e. Producers would outgrow consumers due to the excess of carbon dioxide.
The red panda, a fox-like animal, once was classified as a type of bear, based on morphological characteristics. Which of the following statements is a reasonable deduction based on this phylogenetic classification of the red panda?
a. It means red pandas look like panda bears. b. It means that DNA sequencing was used originally, but morphological evidence later showed otherwise. c. It means that red pandas shared a recent common ancestor, or node, with foxes. d. It means that red pandas are more closely related to raccoons than bears. e. It shows that phylogenies are hypothetical, subject to revision and modification.