A control group differs from an experimental group
A. in the number of test organisms used.
B. by the independent variable.
C. in several ways.
D. in no way.
B. by the independent variable.
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Parasitic species tend to have simple morphologies. Which of the following statements best explains this observation?
A) Parasites are lower organisms, and this is why they have simple morphologies. B) Parasites do not live long enough to inherit acquired characteristics. C) Simple morphologies convey some advantage in most parasites. D) Parasites have not yet had time to progress, because they are young evolutionarily.
Sequences of DNA that are identical when read from the 5' to 3' direction on one strand and the 3' to 5' direction on the other strand are ________.
A. palindromes B. reverse transcriptases C. restriction endonucleases D. ligases E. DNA polymerases
Which of the following is the effect of atrazine
on cells?
a. they induce the conversion of testosterone to estrogen b. they block the production of cortisol c. they enhance the production of melatonin d. they cause the conversion of insulin into glucagon e. they prevent TSH from stimulating thyroid hormone production
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.