The enzyme ____ produces ____ DNA that is complementary to mRNA
a. reverse transcriptase; single-stranded
b. reverse transcriptase; double-stranded
c. DNA polymerase; single-stranded
d. DNA polymerase; double-stranded
e. RNA polymerase; single-stranded
ANSWER: a
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All microbial phototrophs
A) fix carbon dioxide. B) use water as an electron donor for photosynthesis. C) fix carbon dioxide and use water as an electron donor for photosynthesis. D) use light energy to drive electron transport to generate energy.
The key structural difference between DNA and RNA is
A. RNA is a protein, while DNA is a nucleic acid. B. RNA is a polymer, but DNA is not. C. As their names indicate, DNA contains deoxyribose, whereas RNA contains ribose. Thus, DNA contains a different sugar than RNA. D. RNA is a double helix, but DNA is not. E. All the bases in DNA differ from those in RNA.
Which of the following is an example of the
result of a beneficial mutation?
a. A new digestive enzyme that is better at digesting cellulose. b. A new digestive enzyme that is equal in its ability to digest cellulose as the existing enzyme. c. A new digestive enzyme that is less effective at digesting cellulose. d. A new protein that interferes with the digestive process. e. A new protein that has no function
A condition resulting from a reduction in the number of platelets in the blood is ________
Fill in the blank(s) with correct word