If taken within 72 hours of unprotected intercourse, the "morning after" pill should

A) encourage the formation of the corpus luteum.
B) increase progesterone secretion from the ovary.
C) thicken the cervical mucus.
D) reduce sperm motility.
E) delay or prevent ovulation.


E

Biology & Microbiology

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The urinary system helps to maintain the

extracellular fluid pH by a. synthesizing buffers. b. retaining carbon dioxide in the filtrate. c. excreting excess hydrogen ions. d. combining hydrogen ions with urea. e. signaling the respiratory system to adjust breathing rate

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At high population density, __________ is favored,

investing more time and energy in fewer, higher quality offspring. Fill in the blank(s) with the appropriate word(s).

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The incidence of Tay-Sachs disease has been reduced by 75% since the introduction of genetic screening in 1969. Which of the following is NOT an important component of this reduction in incidence of Tay- Sachs disease?

a. genetic counseling b. the fact that Tay-Sachs is caused by a dominant allele c. testing of embryos after fertilization d. birth control e. All of the above are important components of the reduction in incidence of Tay-Sachs disease.

Biology & Microbiology

Aquifex cannot use which of the following as electron donors?

A. Sulfur B. Glucose C. Hydrogen D. Thiosulfate

Biology & Microbiology