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

Biology & Microbiology

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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.

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Which of the following contributes to the semen?

A. penis B. bulbourethral gland C. epididymides D. urethra E. vas deferens

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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

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Biology & Microbiology