If you found a new organism which had a digestive tract wiht no specialized regions, you would classify ti amoung which animals?
A. nematodes
B. earthworms
C. slamanders
D. bird
E. insects
Ans: A. nematodes
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Identify the animal with the most advanced cephalization
a. a flatworm b. an arthropod c. a chordate d. a mollusk e. an echinoderm
Phosphofructokinase (PFK) is an enzyme that converts fructose 6-phosphate to fructose 1,6-bisphosphate, by adding a phosphate group. This is the first committed step of the metabolic pathway of glycolysis, and thus it is very tightly regulated. AMP binds to PFK at a site distinct from the binding site for fructose 6-phosphate, and stimulates the formation of fructose 1,6-bisphosphate. ATP binds to PFK at a site distinct from the binding site for fructose 6-phosphate, and inhibits the formation of fructose 1,6-bisphosphate. There are other regulators of this enzyme as well. What is the role of AMP in this example?
A. Competitive inhibitor B. Noncompetitive inhibitor C. Allosteric inhibitor D. Allosteric activator E. Catalyst
If a mutation rendered the signal recognition particle receptor nonfunctional, what would be the most obvious effect on the cell?
A. Translation of most proteins would be incomplete. B. All proteins normally secreted by the cell would remain partially formed and attached to the endoplasmic reticulum. C. Proteins destined for the nucleus would remain in the cytosol. D. No proteins would arrive at their proper destinations within the cell. E. All proteins normally secreted by the cell would remain in the cytosol.
The resting membrane potential is closest to the equilibrium potential for ________ ions
Fill in the blank(s) with the appropriate word(s).