An allosteric enzyme:
a. has an active site where substrate molecules bind and another site that binds with regulatory molecules
b. is an important energy-carrying nucleotide
c. carries out either oxidation reactions or reduction reactions, but not both
d. raises the activation energy of the chemical reaction it catalyzes
e. only participates in feedback inhibition pathways
a
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How do myelin sheaths increase the speed with which action potentials are propagated along an axon?
A) They increase the permeability of Na+ ions in the plasma membrane. B) They amplify the action potential by increasing sodium influx along the entire distance of the neuron. C) They cause action potentials to "jump" down the axon rather than travel in a continuous path along every site on the axon.
While in the biology lab, you observe, in both plant and animal cells, that some single cells are splitting into two daughter cells. You also observe that the splitting cells are still connected by a contractile ring and the cytoplasm has started to divide. You conclude these cells are undergoing
A. metaphase. B. mitosis. C. cytokinesis. D. anaphase. E. binary fission.
Discuss the main differences between plant and animal growth. What will be an ideal response?
Short, bristlelike fibers extending from the surface of a prokaryote are known as
A. flagella. B. fimbriae. C. villi. D. cilia.