How are the membranes of many eukaryotic organisms able to remain fluid when the temperature
becomes extremely cold?
a. The percentage of unsaturated fatty acids in the membrane is increased.
b. The percentage of saturated fatty acids in the membrane is increased.
c. The percentage of cholesterol molecules in the membrane is increased.
d. The percentage of both unsaturated fatty acids and cholesterol is increased.
e. The percentage of both saturated fatty acids and cholesterol is increased.
D
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The technique that allows various proteins to be differentiated based on size, once the proteins have been denatured, is
A) SDS-PAGE. B) photobleaching. C) liposome formation. D) ferritin-conjugated lectins. E) the freeze-fracture technique.
Which type of species interactions will be harmful to both species involved?
a. Mutualism b. Predation c. Herbivory d. Commensalism e. Interspecific competition
Which hormone is found within the posterior pituitary?
a. ACTH b. TSH c. GH d. oxytocin e. prolactin
Mutations are the original source of new alleles, but may be adaptive, __________ or __________.
Fill in the blank(s) with the appropriate word(s).