The folds of the stomach are called
a. villi.
b. microvilli.
c. tight junctions.
d. rugae.
e. haustra.
D
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If a mitotic poison is administered to the cells of the apical meristem, this substance would
freeze all the cells at the metaphase portion of mitosis. What would you then expect to happen?
a. Accelerated growth would occur. b. No growth would occur. c. There would be no change in the growth rate. d. The growth rate would depend on environmental conditions
What happens to population size (N) if there is no constraint on growth?
a. The population will quickly level out and maintain an equilibrium. b. The population will grow continuously at the same rate. c. The population will grow continuously at an ever-increasing rate. d. The population will decline.
Which of the following statements is TRUE?
a. Once a person reaches maturity, cell division stops except to repair wounds. b. Cell division in an adult signifies cancer. c. Select cells throughout the body retain the ability to divide and replace themselves. d. Growth continues throughout the life of an adult human.
e. All cells retain the ability to divide even after the organism reaches maturity.Starving children in war-torn countries have stick-thin limbs, as their muscle proteins are being broken down and the resultant amino acids are being used by other cells for energy. What hormone(s) would you expect to be especially elevated in these children?
A. Prolactin B. Glucagon C. Insulin D. Aldosterone E. Glucocorticoids