The sex ratio of human senior citizens (>65 years) is
A) skewed toward females.
B) skewed toward males.
C) 1:1.
D) the same as birds'.
A
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The drug RU486, or Mifepristone, functions by _____
A) inhibiting release of gonadotropins from the pituitary B) blocking progesterone receptors in the uterus C) preventing release of the secondary oocyte from the ovary D) reducing sexual interest E) prolonging the endurance of the corpus luteum
Effective treatment of gas gangrene primarily involves
A. use of an antitoxin. B. use of immune globulins. C. vaccination with inactivated toxin. D. surgical removal of dead and infected tissues.
If a mutation occurred in a flatworm such that the flame cells no longer functioned, what do you predict would be the consequence?
A. The parasitic forms could no longer hold onto their host. B. Excretory function would be impaired. C. Digestive function would be impaired. D. Nerve function would be impaired. E. Reproductive function would be impaired.
In which decade of life does the removal of the bone matrix first exceed production of new bone?
A. Second decade B. Third decade C. Fifth decade D. Sixth decade