Which of the following is the greatest threat to
most species survival?
a. overharvesting
b. pollution
c. habitat loss
d. oceanic desalinization
e. none of these is a threat to species survival
C
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The rates of evolutionary change in DNA:
A. are highly variable among different gene families. B. are constant in gene families with a diversity of members. C. can only be determined in conserved genes. D. are constant among different gene families and thus are used to estimate the time of divergence. E. are zero.
People do not develop a secondary immune response to influenza because
A) the immune system mutates from season to season. B) secondary immune responses are only possible against bacteria. C) the primary immune response is sufficient to protect against flu. D) the causative viruses mutate each season.
A bacterium is inoculated into a tube of thioglycollate and incubated. After incubation, turbidity appears throughout, top to bottom, with the greatest turbidty at the very top. This bacterium would be called a(n) ________.
A. psychrotroph B. aerotolerant microbe C. facultative anaerobe D. obligate aerobe E. microaerophile
During a controlled experiment, a scientist isolates and tests
A) a control group. B) a conclusion. C) a single variable. D) a mass of information.