In some male songbirds, long winter nights lead to an increase in melatonin secretion. The rise in melatonin indirectly prevents singing and other courtship behaviors by slowing secretion of which hormone?
a. testosterone
b. estrogen
c. thyroid hormone
d. follicle stimulating hormone
e. growth hormone
a
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The approximate viral concentration of a sample may be determined by
A. quantal assay. B. endpoint assay. C. the titer. D. the lysate assay.
Which of the following impacts occurs during surface mining for minerals like copper? a. None of these choices
b. Increased likelihood for fires. c. Increased aeration of the soil. d. Desalination of the soil. e. Contamination of nearby waterways.
Pregnancy is most likely to occur in a woman with a 28-day cycle if sexual intercourse occurs on day ____.
A. 5 B. 10 C. 15 D. 20
Which technique would make agricultural practices more sustainable?
A) monoculture B) salinization C) integrated pest management D) irrigation