The concentration of nitrogen in the earth’s
atmosphere is approximately
a. 48 percent.
b. 58 percent.
c. 68 percent.
d. 78 percent.
e. 88 percent.
Answer: d
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During an experiment, what is the purpose of a control group?
a. To verify data b. To disprove the theory c. To prove the hypothesis d. To produce replicated results of other groups e. To compare results to the experimental group with the variable being tested
Proteins at tertiary level are reinforced by:
A. S-S bridges B. Hydrophobic interaction C. Covalent bond A. A and B B. B only C. B and C D. All of these E. A and C
Choose the true statement about foreign DNA in the human genome.
A. Most of the foreign DNA in the human genome is coding DNA. B. New foreign DNA is regularly entering the human genome. C. Most of the foreign DNA in the human genome is ancient. D. Like the Drosophila genome, the human genome is constantly eliminating its foreign DNA.
Prokaryotes may have:
a. one single circular chromosome. b. many circular chromosomes. c. one single linear chromosome. d. A and B. e. A, B, and C.