Why can cholesterol act as a “fluidity buffer” in cell membranes?
a. It is slightly amphipathic because of the presence of one hydroxyl group.
b. It is slightly hydrophobic because of the presence of one hydroxyl group.
c. It is slightly hydrophobic because of the presence of one carboxyl group.
d. It is slightly amphipathic because of the presence of one carboxyl group.
e. It is slightly hydrophilic because of the presence of one hydrocarbon group.
a
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Sister chromatids connect at a region of DNA called the centrosome
a. True b. False
Which of the following processes is under voluntary control?
a. filtration b. reabsorption c. urination d. secretion e. excretion
When do you accept an alternative hypothesis?
A. SEM < 0.05 B. p > 0.05 C. p < 0.05 D. SD < 0.05
When electrons are removed from nutrients via an oxidation reaction, the coupled reduction reaction may be
A) NAD+ ? NADH. B) NADH ? NAD+. C) FAD ? FADH2. D) either FAD ? FADH2 or NAD+ ? NADH. E) either NAD+ ? NADH or NADH ? NAD+.