Which of the following statements about telomeres is INCORRECT?
A. Telomeres are lengthened by telomerase.
B. Telomeres are found at the ends of chromosomes.
C. Telomeres are short repeat sequences.
D. Telomeres would be longer in cells of older than younger individuals.
E. Telomeres are crucial to the viability of a cell that replicates often.
D. Telomeres would be longer in cells of older than younger individuals.
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Which of the following statements is not true of the relationship of monarch butterflies and milkweed?
A. Monarch caterpillars are generalists that have evolved ways to metabolize the cardenolides in milkweed latex. B. Young monarch caterpillars feed in trenches, avoiding the latex. C. Older monarch caterpillars sever major veins and feed on resulting "safe" leaf material. D. Monarch caterpillars are specialists that have coevolved with milkweed. E. Monarch butterflies store cardenolides they consume and use them as defenses against predators.
How many layers does the plasma membrane contain?
a. 1 b. 2 c. 3 d. 4
The thinnest vessels in the human circulatory
system are the
a. veins. b. capillaries. c. arteries. d. arterioles. e. venules
If an isotope has a half-life of 4 million years and a fossil is 16 million years old, how much of the original isotope will be found in the fossil?
A) one-half of the original amount B) one-quarter of the original amount C) one-eighth of the original amount D) one-sixteenth of the original amount