Cholesterol
a. has a rigid backbone of four carbon rings.
b. is the most common sterol in animal tissue.
c. is a lipid without a fatty-acid component.
d. is needed to produce sexual development and
maturity.
e. is all of these.
Answer: e
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The essential protective role for T cell immunity is protection from
A) viruses. B) extracellular pathogens. C) bacteria. D) intracellular pathogens.
Consider a living plant cell in a living leaf that is not wilted. The pressure potential (?P) of such a cell
____ than that in the fluids surrounding the cell.
a. is typically lower b. varies widely from higher to lower c. is typically higher d. is typically about the same as e. is typically more negative
Which of the following methods is the most effective as birth control?
a. condoms b. diaphragms c. abstinence d. oral contraceptives e. vasectomy
If four genes are in the same region of a eukaryotic chromosome, then
A) the four promoters must be oriented such that two genes are transcribed using the Watson strand as a template and two genes use the Crick strand. B) the four promoters must be oriented such that all four genes are transcribed using the same strand as the template. C) the four promoters may be oriented such that some of the genes are transcribed using the Watson strand as template, and others use the Crick strand. D) the genes can be transcribed from different strands only if their promoters are more than 1 kilobase apart. E) the genes must be in a gene family.