Which one of the following types of proteins interacts directly with a stop codon?
A. release factor
B. initiation factor
C. transcription factor
D. elongation factor
E. sigma factor
Answer: A
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Rickettsias are not ________.
A. the cause of Rocky Mountain Spotted Fever B. obligate intracellular parasites C. able to use glucose as an energy source D. All of the choices are correct.
Uracil is found in ___________
a. both DNA and RNA b. only in RNA c. only in DNA
Recall that light can be emitted from an atom when the atom loses energy. Which of the following processes is responsible for this production of light?
a. An electron moves closer to the nucleus of the atom. b. An electron moves farther away from the nucleus of the atom. c. An electron orbits the atom. d. A proton is released from the nucleus of the atom. e. The proton comes into close contact with a neutron of another atom.
Most of the ultraviolet radiation reaching the upper atmosphere is absorbed by
A. ozone. B. water vapor. C. nitrogen. D. carbon dioxide. E. CFCs.