Based on hierarchical levels of biological organization, which represents the broadest level?
A. school of piranhas
B. jaguars, giant anteaters, macaws, capybaras
C. three-toed sloths
D. Amazon Basin
E. endocrine system
Answer: D
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The key structural difference between DNA and RNA is
A. RNA is a protein, while DNA is a nucleic acid. B. RNA is a polymer, but DNA is not. C. As their names indicate, DNA contains deoxyribose, whereas RNA contains ribose. Thus, DNA contains a different sugar than RNA. D. RNA is a double helix, but DNA is not. E. All the bases in DNA differ from those in RNA.
Which of the following enzymes is responsible
for the wide range of diversity found in RNA viruses?
a. DNA polymerase b. RNA polymerase c. reverse transcriptase d. protease e. ligase
To your chagrin, you and your labmate have discovered that you both labeled your petri dishes “A”, “B”, and “C”. How can you distinguish your sea urchin gastrula embryos from her frog gastrula embryos?
A. Unlike frogs, sea urchins are deuterostomes which form the anus first and the mouth second. B. Sea urchin cells migrate inside to form the archenteron, whereas in frogs proliferation of dividing cells from the dorsal lip populate the inside of the embryo. C. Sea urchins have relatively yolk-poor eggs with similar animal and vegetal poles, whereas frogs have large amounts of yolk distinguishing the vegetal pole from the animal pole. D. Frogs have an animal pole and vegetal pole, whereas urchins have only a vegetal pole. Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about eggs? 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?
Homeotic genes
a. code for homeodomains. b. code for regulatory proteins. c. are a class of master genes. d. affect transcription. e. are all of these.