Single-celled parasites known as ____ infect insects, fish, and humans (especially those with compromised immune
systems).
a. amoebae
b. red algae
c. microsporidia
d. dinoflagellates
e. apicomplexans
ANSWER: c
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The enormous genetic diversity of HIV has made it especially difficult to create a vaccine against the virus. We can attribute this genetic diversity to
A. mutation hotspots in the hemagglutinin (H) molecule. B. mutation hotspots in the CD4+ molecule. C. the high error rate of reverse transcriptase. D. the high sensitivity of the virus to UV radiation. 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 HIV infection? Choose Answer · Given what you now know, what information and/or problem solving approach 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?
Which of the following is the main form of nitrogenous wastes released by birds to their environment?
a. nitrate b. ammonia c. uric acid d. amino acids e. urea
Nondisjunction may cause
A. Jacobs syndrome. B. Klinefelter syndrome. C. All of the answer choices are correct. D. trisomy 21. E. Turner syndrome.
Punctuated equilibrium proposed by Eldredge and Gould in 1972 is an evolutionary process that involves
A. gradual change observable in the fossil record with very little, if any, stasis. B. gradual change observable in the fossil record followed by periods of no change at all. C. "spurts" of change observable in the fossil record with very little if any stasis. D. gradual change observable in the fossil record followed by periods of stasis. E. "spurts" of change observable in the fossil record followed by periods of stasis.