How many times does DNA wrap around a histone?
a. 1
b. 2
c. 4
d. 6
e. 10
ANSWER: b
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Which of the following operations will NOT increase the industrial lysine production?
A) using a bacterial strain in which aspartokinase does not bind to S-aminoethylcysteine (AEC), an aspartokinase inhibitor. B) increasing the concentration of S-aminoethylcysteine (AEC), an aspartokinase inhibitor, in the fermentor. C) fermenting with a bacterial strain that contains mutations in the allosteric site of aspartokinase. D) increasing the precursor (aspartate) concentration. E) growing the lysine producing bacterium in a chemostat with constant removal of lysine
Which of the following observations provides the strongest evidence against root pressure being the principal mechanism of water transport in the xylem?
A) Not all soils have high concentrations of ions. B) Root pressure requires movement of water into the xylem from surrounding cells in the roots. C) Over long distances, the force of root pressure is not enough to overcome the force of gravity. D) There is no water potential gradient between roots and shoots.
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+.
Haplodiploidy is necessary for eusociality.
Answer the following statement true (T) or false (F)