Which of the following is a reason for metabolic regulation?
A. Maintain cell components at appropriate levels
B. Ensure efficient use of energy stores
C. Conserve materials
D. All of the choices are correct.
Answer: D
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A. Potential energy B. Geothermal energy C. Solar energy D. Wind energy
Which of the following statements is NOT TRUE
concerning an electron that has absorbed a photon? a. It moves to a higher energy level. b. It becomes more stable. c. It quickly returns to its original energy level. d. It may emit energy. e. It becomes excited.
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A) generally have no effect on the phenotype. B) are usually detrimental to fitness. C) may be eliminated by natural selection. D) occur more frequently than nonsynonymous changes. E) B and C only
A virus basically consists of
A) RNA or DNA and a membrane. B) RNA or DNA and enzymes. C) proteins and a cell membrane. D) enzymes and a protein coat. E) RNA or DNA and a protein coat.