During the early phase of the ovarian cycle, which ovarian hormone is at the highest levels?
a. GnRH
b. estrogen
c. progesterone
d. FSH
e. hCG
ANSWER: b
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Plant cells assimilate nitrogen in the form of
a. ammonia and N2. b. N2 and nitrite. c. nitrate and ammonia. d. urea and nitrate. e. uric acid.
Can energy be harvested by the cells from glucose without oxygen?
A) Yes, about as much as with oxygen. B) Yes, but not quite as much as with oxygen. C) Yes, but much less than with oxygen. D) No, oxygen is required to harvest any energy from glucose.
Which statement about breast cancer is FALSE?
a. Cigarette smoking, obesity, and alcohol use have all been linked to a higher risk of breast cancer. b. With early diagnosis and treatment, almost 90% of breast cancer patients survive for five years. c. Breast cancer is the leading cause of cancer deaths in women. d. Growth of about two-thirds of breast cancers is enhanced by circulating estrogens and progesterone. e. Ten percent of breast cancers are familial.
Silent copies of genes that have been inactivated by mutations are called
A. exons. B. clones. C. introns. D. pseudogenes.