Complexity in cell communication from molecular cross talk can be due to (select all correct choices):
A. inhibition of one signaling pathway by a
component of another signaling pathway.
B. an intersection of two signaling pathways
that allow two signals to enhance the cellular
response.
C. signaling molecules interacting and
inhibiting or enhancing their activation
potential.
D. None of these choices is correct.
A,B
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Some of the most dramatic evidence for evolution has come from human agriculture. One of the most highly artificially selected crop plants is
A. peas. B. tomatoes. C. potatoes. D. corn. E. asparagus.
The shared primate characteristic depicted in Figure 22-1 is:
a. a prehensile appendage.
b. an opposable thumb.
c. an enlarged foramen magnum.
d. four grasping digits.
e. an opposable thumb.
Which of the following is an example of feeding behavior that has a high energy intake to effort ratio?
a) human children eating dirt b) crabs eating mussels that are intermediate in size c) geese retrieving the largest egg-like object near their nests d) a monkey reaching over a snake to get a peanut e) vampire bats sharing blood meals with non-relatives
Which of the processes named here is the least likely to contribute to the evolution of genetic diversity of bacteria and archaea?
A. Sexual reproduction B. Horizontal gene transfer C. Mutation D. Binary fission