Cell-mediated immunity most directly involves cells attaching infected and/or cancerous cells.
A) B
B) T
C) Macrophage
D) MHS
Ans: B) T
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The act of nursing stimulates the contraction of smooth muscle cells in the breast. If a newborn infant is unable to nurse, then
A. progesterone secretion is not inhibited. B. milk is not produced. C. oxytocin is not secreted. D. prolactin is not secreted. E. prostaglandins are not secreted.
When some members of a group of organisms adapt to a new general way of life, they are said to be
entering
a. a new niche b. an adaptive zone c. an adaptive radiation d. a new habitat e. a period of punctuated equilibrium
You are studying the hormonal control of metamorphosis in amphibians. If the anterior pituitary were
prevented from releasing TSH, predict the effect on tadpoles.
a. Conversion to frogs would be increased five-fold. b. Metamorphosis would be extremely slow. c. Calcium secretion in tadpoles would be inhibited. d. Metabolism in tadpoles would be greatly decreased. e. Metamorphosis would be extremely slow and metabolism in tadpoles would be greatly decreased.
During the process of successional change, ____
a. the total mass of living things remains constant b. pioneer species help build and improve the soil c. the pioneer community gives way quickly to the climax community, followed by a succession of more diverse arrays of organisms d. nutrients cycle more rapidly with time e. indicator species disappear