Before examining a fungal cell under a microscope, you are told that it is dikaryotic. Given that, you should expect the
cell to have two ____.
a. complete sets of chromosomes
b. diploid nuclei
c. hyphae
d. haploid nuclei
e. diploid nuclei and two hyphae
ANSWER: d
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Which of the following is a reasonable explanation for why unsaturated fatty acids help keep a
membrane more fluid at lower temperatures?
a. The double bonds form a kink in the fatty acid tail, forcing adjacent phospholipids to be spaced further apart. b. Unsaturated fatty acids have a higher cholesterol content. c. Unsaturated fatty acids permit more water in the interior of the membrane. d. The double bonds block interaction among the hydrophilic head groups of the lipids. e. The double bonds result in a shorter fatty acid tail.
A normally functioning pancreas produces insulin, a hormone that causes cells to ____
a. produce glucagon b. take up and store glucose c. synthesize protein d. break down glucose e. produce glucagon
Which of the following best describes the bacterial cell wall?
A) Protects the cell from osmotic lysis B) Contributes to pathogenicity C) Site of action of several antibiotics D) All of the above
DNA methylation is the only known natural modification of DNA. It affects
A. guanine bases. B. cytosine bases. C. adenine bases. D. thymine bases.