Which of the following is not a mechanism used to move materials in and out of the cell?
a. osmosis
b. feedback inhibition
c. facilitated diffusion
d. active transport
Answer: b. feedback inhibition
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One function of HCl secreted in the stomach is to convert pepsinogen into the active enzyme pepsin. Why don't stomach cells simply secrete pepsin instead?
A. Adequate amounts of pepsin are already manufactured by the pancreas. B. Only the pepsinogen version is able to stabilize fat-water emulsions. C. Pepsin is denatured and rendered inactive in solutions with low pH. D. If cells produced active pepsin, they would digest their own cellular proteins.
How does the likelihood of the survival of technological societies restrict the number of civilizations with which we might communicate?
What will be an ideal response?
An example of keystone species are ____
a. beavers that build dams b. mice that feed on mushrooms and truffles c. Douglas fir trees d. kudzu e. earthworms that aid decomposition
Prokaryotes
a. have nucleoid regions. b. are unicellular. c. may have cell walls. d. are either bacteria or archaeans. e. are all of these.