Arsenic is a potent poison because it causes ________
a. carbon dioxide to buildup
b. enzymatic activity to stop
c. ATP production to stop
d. too much oxygen build up
e. lactate to build up in the muscles
Ans: c. ATP production to stop
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Areas of the chromosome that remain highly condensed are called ______
A. Euchromatin B. Facultative heterochromatin C. Constitutive heterochromatin D. Barr body
Which of the following does not initiate DNA synthesis?
a. a double-stranded DNA virus (Poxviridae) b. a DNA virus with reverse transcriptase (Hepadnaviridae) c. an RNA virus with reverse transcriptase (Retroviridae) d. a single-stranded RNA virus (Togaviridae) e. none of the above
At the start of the breeding season, male stickleback fish undergo a number of significant changes
Their bellies become bright red and they become aggressive toward other males of the species, establishing and defending territories in which they build their nests. Although most male-male encounters consist solely of the resident lunging at an intruder, if this fails to drive off the intruder, the resident may bite. Females choose to mate with males that have large territories and well-constructed nests. What would you expect to happen as nest sites become scarcer? A) The incidence of biting and other aggressive behaviors will increase. B) Females will begin to choose mates that have no territories. C) The color of the males will fade. D) Nest construction will deteriorate. E) Males will make their territories even larger.
Which of the following are characteristics of attenuated viral vaccines?
a. They provide short-lived immune responses. b. They are easy to store and maintain their potency for long periods of time. c. They provide long-lasting T cell–mediated immunity. d. They do not develop long-term memory responses.