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
D. Allosteric activator
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A. open reading frame B. hairpin structures C. transcription factors D. coding region E. All of the answer options are correct.
Which of the following is not coded for by the retroviral genome?
A. viral coat proteins B. tRNA C. reverse transcriptase D. integrase E. envelope protein
Once the gene that confers blight resistance has been identified, it must be _______________
a. inserted into a plasmid b. translated and transcribed c. modified d. injected into the nonresistant plant cells
Active genes in eukaryotic cells are associated with
A. heterochromatin. B. methylated RNA and histones. C. DNA with many methyl groups. D. euchromatin.