Why is it believed that RNA was the first informational molecule to evolve?
a. RNA molecules can replicate into DNA molecules.
b. RNA molecules are more central to modern inheritance than DNA.
c. RNA molecules degrade more slowly in solution than DNA molecules.
d. RNA molecules are much simpler structures than other macromolecules.
e. RNA molecules are able to function as both enzymes and substrates for their own replication.
e
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Indicate whether the statement is true or false
Competitive advantages for cyanobacteria in the aquatic environment include ________.
A. the ability of many to fix nitrogen B. the production of hydroxamates to bind iron C. the production of toxins to resist predation D. All of the choices are correct.
The kidneys receive about __________ percent of
the cardiac output at rest. a. 5 b. 9 c. 13 d. 15 e. 20
A range of values such that there is a specified probability that they contain a population parameter is known as a(n):
A. confidence interval. B. random sample. C. unbiased estimator. D. sample mean.