The plasma membrane of intestinal epithelial cells requires separate targeting of proteins to
a. one continuous plasma membrane domain.
b. two plasma membrane domains: the apical and basolateral domains.
c. three plasma membrane domains: the apical, lateral, and basal domains.
d. four plasma membrane domains: one apical, two lateral, and a basal domain.
Ans: b. two plasma membrane domains: the apical and basolateral domains.
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Repressible operons are normally turned on in the cell.
Answer the following statement true (T) or false (F)
Primitive reptiles first appeared during the _____ period.
A. Carboniferous B. Cambrian C. Devonian D. Ordovician E. Silurian
According to the intermediate disturbance
hypothesis, a. species richness becomes greatest in between disturbances of moderate intensity or frequency. b. a disturbance is necessary during succession in order to stabilize the community. c. community succession is highly predictable. d. competition and other species interactions are the most important factors in shaping community structure. e. a community reverts to a climax state after a disturbance.
The most common form of skin cancer is found most frequently on the head, neck or back.
a. true b. false