In clinical studies, nutritional supplements that
block the activity of myostatin had which of
the following effects?
a. increased muscle mass in both
homozygotes and heterozygotes
b. increased muscle mass in homozygotes
only
c. increased muscle mass in heterozygotes
d. reduced muscle mass in both heterozygotes
and homozygotes
e. the nutritional supplements had on effect at
all
E
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In the study involving periwinkle snails and their algal food sources, which conclusion can be drawn?
a. Periwinkles eliminated all algae and died out. b. Periwinkles eliminated all of the less dominant algae species. c. Periwinkles eliminated the dominant algae entirely. d. Periwinkles had no effect on the algae populations. e. Periwinkles can increase or decrease species richness depending on which algal species it is consuming.
The rate of diffusion across a selectively
permeable membrane will be slow when which of the following is (are) true? I. concentration gradients are steep II. temperatures are low III. solutes are small molecules
a. I only b. II only c. I and III d. II and III e. I, II, and III
Conduction from node to node
a. occurs only in the central nervous system. b. is a rapid type of nerve conduction. c. occurs between nerves and muscles. d. involves the "jumping" of impulses. e. is a rapid type of nerve conduction and involves the "jumping" of impulses
The diverse topography of mountainous regions generally supports more species of plants and animals than the consistent terrain of flatlands
Indicate whether the statement is true or false