The primary lipid components of the membranes of extreme thermophiles are ________.
A. 20 carbon diglycerol diethers
B. 40 carbon diglycerol tetraethers
C. sulfolipids
D. cholesterol
Answer: B
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Sieve tubes are different from vessel members
because they a. do not have nuclei. b. are not connected to each other. c. are alive at maturity. d. conduct minerals. e. fit all of these descriptions.
Which of the following contributes to the semen?
A. penis B. bulbourethral gland C. epididymides D. urethra E. vas deferens
Some mutagens cause genetic changes that can be "corrected" by reexposing cells to the same mutagen. Other mutagens do not behave in this way. Provide one example of each of these two types of agents and describe the mutational changes caused in
Explain why some mutagens behave in one way, whereas others do not.
Why is combination drug therapy less likely to lead to resistance than single drug therapy?
A) In the presence of multiple drugs, the mutation rate of HIV decreases. B) The drugs improve the immune system so that it's better able to find and remove virus particles. C) The likelihood of one virus spontaneously mutating to be resistant to three different drugs is extremely small. D) There are fewer side effects associated with combination drug therapy, and the appearance of resistance is directly proportional to the severity of side effects.