Which of the following is nota cellular response to amino acid starvation in E. coli?
A. Levels of guanine tetraphosphate rise.
B. Levels of cAMP decrease.
C. The transcription of genes needed for rapid growth decreases.
D. rRNA synthesis is decreased.
B
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Which of the following is NOT a function of parathyroid hormone?
A. It increases calcium production in the liver. B. It increases calcium absorption across the intestine. C. It increases reabsorption of Ca2+ in the kidney. D. It stimulates osteoclasts to dissolve CaPO4 crystals in bone.
The distance through which a microscopic specimen can be moved and still have it remain in focus is called the
a. field of view. b. working distance. c. depth of field. d. magnification.
Which of the following would be a situation similar to genetic drift?
a. Fill a bag with 200 pennies and 200 dimes. Pull out two coins and write down the results. If two dimes are pulled, throw them back in. Do this 50 times. b. Randomly pull out two beads from a bag of 500 red beads and 500 yellow beads. Do this 100 times, getting an average of 100 yellow beads and 100 red beads by the end. c. Flip a coin twice and write down the results. Do this four times. The coin comes up heads each time. d. Fill one bag with 300 blue marbles and another bag with 150 blue marbles and 150 green marbles. Move 10 random marbles from the mixed bag to the bag with all blue marbles.
The lowest layer of the atmosphere, from sea level to about 7.4 miles, is the:
A) troposphere. B) ionosphere. C) stratosphere. D) ozone layer.