Polymerase chain reaction (PCR) is useful for amplifying a small piece of DNA but is not a good technique for cloning genes because
A) DNA ligase cannot be used in PCRs.
B) PCRs do not generate palindromic sequences.
C) copies of DNA produced by PCRs lack the regulatory genes and proteins required to activate genes.
D) PCRs only generate primary transcripts that require excision of introns.
E) ribosomes are required to produce active genes.
C
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Drugs that are HIV protease inhibitors
A. prevent HIV protease from degrading host cell proteins. B. block the translation of HIV proteases. C. bind to HIV proteases. D. prevent HIV proteases from breaking apart capsid proteins. E. both bind to HIV proteases and prevent them from breaking apart capsid proteins.
Which of the following taxa is NOT known to contain species that cultivate fungi for food?
A. leaf-cutting ants B. humans C. termites D. beetles E. nematodes
Refer to Figure 10-1. Which of the following combinations of letters accurately represents two
homologous chromatids?
a. A and B
b. A and C
c. A and D
d. B and F
e. D and E
If blood volume increases, blood pressure will ________ and the firing rate of baroreceptors will ________.
A. decrease; increase B. decrease; decrease C. increase; decrease D. increase; increase