In many species, sexual selection is the most probable cause of ____, differences in the size or appearance of males
and females.
a. adaptive radiation
b. Inbreeding
c. mutation
d. polymorphism
e. sexual dimorphism
ANSWER: e
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The fungus Pneumocystis carinii is of significance to AIDS patients because:
A. It is transmitted sexually and is the cause of AIDS. B. It attacks T-cells in the same way as does AIDS and thereby increases the severity of the disease. C. It attacks the AIDS pathogen and thereby reduces the severity of the disease. D. It infects individuals whose immune system has been weakened by AIDS and causes pneumonia. E. none of the other choices provided
Cytotoxic T cells destroy cancerous cells by
A. forming the membrane attack complex. B. releasing vesicles containing perforin. C. activating natural killer cells. D. opsonization. E. secreting cytokines.
According to the fluid mosaic model of cell membranes, which of the following is true regarding
membrane phospholipids?
a. They are anchored in place by intermediate filaments. b. They can move laterally along the plane of the membrane. c. They have hydrophilic tails in the interior of the membrane. d. They occur in an uninterrupted bilayer, with membrane proteins bound only to the surface of the membrane. e. They are free to leave the membrane and dissolve in the interstitial fluid.
Stretched out, an adult's gastrointestinal tract would be
a. 10?15 feet. b. 15?20 feet. c. 21?30 feet. d. 30?35 feet. e. 5?10 feet.