A friend tells you that her husband has been feeling anxious and stressed for the past month. During this same time interval, he has had several infections, bouts of forgetfulness, and erectile dysfunction. Doctors have already checked for ulcers, cancer, blood pressure changes, and other blood irregularities, but these apparently are normal. You are an endocrinologist, so you suggest that he be
tested for the most likely endocrine malfunction, which would be altered ____ levels in the blood.
a. estrogen
b. cortisol
c. calcitonin
d. melatonin
e. testosterone
b
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Refer to the paragraph on the effects of estrogens in the environment
You are assigned to write the report to the Environmental Protection Agency, which needs to decide what level of 17?-estradiol to permit in sewage output. You do not want to make the level any lower than necessary, because it requires substantial additional money for the extra treatment of sewage. Given the data presented above, what level of 17?-estradiol would you suggest is safe to prevent feminization of fish? A) 2.5 ng/l B) 5 ng/l C) 12.5 ng/l D) 25 ng/l E) 100 ng/l
Transposition is a(n)
A) homologous recombination event. B) analogous recombination event. C) site-specific recombination event. D) general recombination event.
Hypothesis I: A flavin pigment absorbs blue light; this pigment then activates the proton pump.Hypothesis II: When CO2 concentration rises, a membrane receptor inactivates the proton pump.Air with varying amounts of CO2, within the ranges found in nature, is forced across leaf surfaces and into sub-stomatal cavities; this produces closure of the stomata.
A. Supports both hypothesis I and II. B. Supports only hypothesis I. C. Supports only hypothesis II. D. Supports neither hypothesis.
There are over fifty modified bases in tRNAs. Are the nucleotides modified before or after incorporation into the tRNA?
What will be an ideal response?