The antiviral drugs currently approved for use in HIV disease include
A. protease inhibitors.
B. nucleoside reverse transcriptase inhibitors.
C. fusion inhibitors.
D. nonnucleoside reverse transcriptase inhibitors.
E. All of the choices are correct.
Answer: E
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Self-incompatibility in flowering plants is a biochemical recognition and rejection process that
a. prevents both self-fertilization and self-pollination. b. prevents self-pollination and occasionally prevents self-fertilization. c. prevents self-fertilization but not self-pollination. d. prevents self-pollination but not self-fertilization. e. prevents self-fertilization and occasionally prevents self-pollination.
Why is olfaction an ancient sense?
a. it was the first sense to develop in humans b. it was used solely to find potential mates c. it was used to detect predators d. it was used to find shelter e. it was the first sense to develop in amphibians
Introns are known to contain termination codons (UAA, UGA, or UAG), yet these codons do not interrupt the coding of a particular protein. Why?
A) More than one termination codon is needed to stop translation. B) Introns are removed from mRNA before translation. C) UAA, UGA, and UAG are initiator codons, not termination codons. D) Exons are spliced out of mRNA before translation. E) These triplets cause frameshift mutations, but not termination.
Some regions of chromosomes remain highly condensed, tightly coiled, and untranscribed throughout the cell cycle. These regions are referred to as
A. noncoding DNA. B. single sequence repeats. C. constitutive heterchromatin. D. short interspersed elements. E. transposable elements.