The event that occurs when allolactose levels increase in E. coli is
A. transcription of genes within the lac operon increases.
B. transcription of genes within the lac operon decreases.
C. transcription of genes within the lac operon does not change.
D. E. coli cells replicate rapidly.
E. the tryptophan operon becomes more active.
A. transcription of genes within the lac operon increases.
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A mutation in an enzyme prevents it from binding substrate. This description is referring to the enzyme's:
A. phenotypic function B. cellular function C. molecular function
If a daughter expresses an X-linked recessive
gene, she inherited the trait from a. her mother. b. her father. c. both parents. d. neither parent. e. her grandmother
Explain how the trp operon is regulated in a prokaryotic cell when tryptophan is present.
What will be an ideal response?
Suppose you conduct an experiment in the laboratory in which you add increasing amounts of substrate to a solution containing an enzyme and a pH buffer. You incubate the container at the optimal temperature for the enzyme. Each time you add more substrate, you measure the rate of the reaction. Also suppose that you graph the results such that the x-axis shows the substrate concentration and the y-axis shows the resulting reaction rate. What will you find over time?
a. The rate of the reaction will increase rapidly, taper off, and plateau. b. The resulting graph will be a perfect bell curve. c. The rate of the reaction will increase slowly, plateau, and then drop sharply back to zero. d. The rate of the reaction will proceed with a slope of 1 and continue in a linear fashion indefinitely or until you run out of reactants.