If you mutate the gene encoding a Cdk such that Cdk protein product cannot bind to cyclin, what effect would you expect to see?
A) Cdk will be unaffected.
B) The cell cycle will be up-regulated, and the cells will proliferate.
C) Cdk will be inactive, so the target proteins will not be phosphorylated.
D) Cdk will be constitutively active, so the cell cycle will be unchecked.
E) Cdk will phosphorylate its target proteins regardless of the cell cycle.
C
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Hexokinase is an enzyme that binds specifically to glucose and converts it into glucose 6-phosphate. The activity of hexokinase is suppressed by glucose 6-phosphate, which binds to hexokinase at a location that is distinct from the active site. This is an example of.
A. feedback inhibition. B. competitive inhibition. C. cofactor binding. D. allosteric activation.
The pan genome of a microbial species is constantly changing because of
A) bottleneck events. B) horizontal gene transfer. C) substitutions. D) substitution and bottleneck events.
How are simple diffusion and facilitated diffusion different?
a. Facilitated diffusion is passive transport, while simple diffusion is not. b. Facilitated diffusion requires a transport protein, while simple diffusion does not. c. Simple diffusion requires a transport protein, while facilitated diffusion does not. d. Simple diffusion is passive transport, while facilitated diffusion is not.
What term would be applied to a regulatory condition that occurs when a protein is associated with a particular section of DNA and greatly reduces transcription?
A) positive control B) induction C) activation D) stimulation E) negative control