Which of the following is NOT true about sponges?
a. They have few predators or pathogens.
b. Some groups have sharp spicules of silica or
calcium carbonate.
c. Some species secrete a slimy body coating.
d. They can harvest sea anemone nematocysts and
use them for their own defense.
e. Disease and overharvesting have caused
population declines.
Answer: d
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Assuming there is sufficient light to drive photosynthesis, the rate of transpiration should ___________ on a rainy day compared to a sunny day because _____________
A. decline; the H2O concentration gradient from the inside to the outside of the leaf would decrease B. decline; the H2O concentration gradient from the inside to the outside of the leaf would increase C. remain the same; the H2O concentration gradient from the inside to the outside of the leaf would not change D. increase; the H2O concentration gradient from the inside to the outside of the leaf would decrease E. increase; the H2O concentration gradient from the inside to the outside of the leaf would increase
During the short recovery period before another
action potential, the a. threshold value is increased. b. threshold value is reduced. c. sodium gates are shut, and the potassium gates are opened. d. sodium-potassium pumps restore the ion gradients across the membrane. e. sodium gates are shut, potassium gates are opened, and the sodium-potassium pumps restore the ion gradients across the membrane.
Fall leaf color on deciduous trees is a result of
A. the production of more accessory pigments because of the cooler temperatures. B. cessation of chlorophyll production, which allows the accessory pigments to be revealed. C. the increased angle of the sun during the fall, which reflects more of the accessory pigments. D. the reduction in the production of accessory pigments.
Which membrane would show a more rapid recovery of fluorescence in a FRAP study?
A. a membrane containing equal amounts of saturated and unsaturated fatty acids B. a membrane containing a larger proportion of saturated fatty acids C. a membrane containing a larger proportion of unsaturated fatty acids D. The saturation of fatty acids in a cell membrane does not affect the speed of fluorescence recovery in a FRAP study. E. a membrane containing a large amount of cholesterol