In the life cycle of a typical cnidarian, which of the
following is free-swimming?
a. medusa
b. polyp
c. planula
d. medusa and planula
e. all of these
Answer: d
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Sulfur occurs in all living matter primarily as a component of
A. fatty acids. B. nucleotides. C. amino acids. D. carbohydrates
Which of the following observations was not considered by Darwin as he developed the theory of evolution by natural selection? a. Populations can produce more individuals than the environment can support
b. Individuals that are better suited to their environments produce more offspring. c. Variation exists within populations, and some variants are better suited to their environments than others. d. Individuals that are less well suited to their environments produce no offspring.
Nitrogen-fixing bacteria convert ____ to ____
a. gaseous nitrogen; ammonia b. ammonia; gaseous nitrogen c. gaseous nitrogen; nitrates d. gaseous nitrogen; nitrites e. ammonia; nitrates
The field of study that focuses on how genes determine an individual's response to a medication is ____
a. pharmacokinetics b. pharmacodynamics c. pharmacogenetics d. pharmacotherapeutics e. pharmacoeugenics