Which of the following is not true about the G + C content percentages in DNA of organisms?
A. Organisms with similar G + C percentages have similar base sequences.
B. Similar G + C percentages only suggests relatedness if the two organisms are also alike phenotypically.
C. Organisms with different G + C percentages have dissimilar base sequences.
D. All of the choices are correct.
Answer: A
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Which of the following supports the argument that viruses are nonliving?
A) They lack genetic material. B) They are not cellular. C) Their DNA does not encode proteins. D) They have RNA rather than DNA. E) They do not evolve.
When you are lifting weights, the arterioles
servicing your biceps are
a. constricted. b. dilated. c. supplying less blood. d. shut down. e. doing more than one of these
Which of the following is(are) true about
predator-prey coevolution? a. Each species exerts selection pressure on the other. b. Predators are selective agents that favor improved prey defenses. c. Prey with better defenses are selective agents that favor better predator hunting skills. d. All of the above are true. e. None of the above are true
The first function of feathers was most likely:a
as protection from predators. b. to insulate. c. to communicate with rivals.
d. as color displays in courtship rituals. e. as protection from parasites.