The midrange of an array of phenotypes is favored in ________.
A. genetic drift
B. stabilizing selection
C. gene flow
D. disruptive selection
E. directional selection
Answer: B
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Some patients with defective mitochondria in their muscles are extremely limited in their ability to exercise
Muscle biopsy followed by microscopic examination of the mitochondria, reveal that they are of normal size, but their inner membranes are not as convoluted as normal mitochondria. How can this mitochondrial defect cause the described symptoms in the patients? A. It can't. There must be something wrong with something else in the muscle cells. B. A less convoluted membrane is more permeable, so ATP cannot be synthesized efficiently. C. A less convoluted membrane has less surface area, so there is not as much of the ATP-making machinery. D. The less convoluted inner membrane causes the two membranes of a mitochondrion to adhere together, decreasing the mitochondrial effectiveness. E. There is not enough information to determine the cause.
Energy that drives transcription is provided mainly by _____
a. ATP b. RNA nucleotides c. GTP d. all are correct
Most multivitamins should be taken with a meal for which reason?
A. to provide the energy needed to use the vitamins B. to help with the absorption of water-soluble vitamins C. to help with the absorption of fat-soluble vitamins D. to provide food for the vitamins to break down E. to provide the energy needed to synthesize more vitamins
Which of the following is currently the largest group of cultured Archaea?
A. Extreme halophiles B. Methanogens C. Sulfate reducers D. Extreme thermophiles