How many years did it take for the world population to reach one billion?
a. 100,000
b. 500,00
c. 1 million
d. 2 million
e. 2.5 million
ANSWER: e
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Which of the following traits is not characteristic of arthropods?
a. jointed appendages b. hardened exoskeleton c. specialized developmental stages d. lack segmentation
Gibberellin stimulates ____
a. fruit ripening b. leaf abscission c. lateral root formation d. stem lengthening between the nodes e. stem lengthening at the tip
In fragile X syndrome, the fragile X gene contains the nucleotide triplet CGG that repeats 200-1000
times. Indicate whether the statement is true or false.
Which of the following statements about protein kinase A (PKA) is false?
a. In the inactive state, PKA exists as a tetramer of two regulatory (R) and two catalytic (C) subunits. b. PKA binds a total of four molecules of cAMP, one on each of the four subunits. c. PKA binds a total of four molecules, two molecules on each of the two regulatory (R) subunits. d. Once activated, the catalytic (C) subunits dissociate and activate target molecules.