Which series of letters lists the first four steps of the scientific method (see question 5) in the correct order?
(a) a, b, c, d.
(b) a, b, d, c.
(c) c, a, b, d.
(d) d, c, a, b.
(c) c, a, b, d.
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What is the term used to define a secondary sexual characteristic in males, such as manes on lions or colorful plumage on peacocks?
A. gene flow B. fitness C. sexual selection D. sexual dimorphism
Why should humans consider eating “lower on the food chain”?
a. We digest and assimilate plant material more efficiently than meat. b. We digest and assimilate meat more efficiently than plant material. c. Many regions exist that support vegetation suitable only for feeding large herbivores.
d. Energy efficiency is greater when passed through fewer trophic levels. e. No biological reaction is 100% efficient.
Enzymes
a. are usually carbohydrates. b. can only catalyze a reaction once. c. reduce the activation energy of chemical reactions. d. eliminate the activation energy of chemical reactions.
Which of the following is TRUE of fertilization?
A. It is critical to maintaining membrane polarity. B. It restores the egg to a diploid state. C. It both restores the egg to a diploid state and maintains membrane polarity. D. It activates cell division. E. It both restores the egg to a diploid state and activates cell division.