Which of the following events represses the expression of the bacteriophage ? cI gene?
A. activation of PRE by cII protein
B. Cro protein binding to the OR3 operator
C. multiple viral particles infecting a single cell
D. cIII protein protecting cII from proteolysis
B
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Enzyme inhibition
A. refers to the interference with a chemical reaction caused by an enzyme. B. is the tendency to stop a chemical reaction caused by two different enzymes interfering with each other. C. is caused by a chemical that prevents the enzyme from acting on the natural substrate. D. is the ability of an enzyme to decrease the need for activation energy.
Acceptance of the Three Domain system would require a complete reorganization of the Five Kingdom classification.
a. true b. false
Using a specific chemical, a cell biologist has blocked one type of channel-linked receptor in a lab rat's liver tissue. What was the likely mechanism of the chemical she used?
A. The chemical prohibits ions from entering the cell via active transport. B. The chemical prohibits second messenger signaling. C. The chemical prohibits binding of a ligand to the receptor. D. The chemical causes ions to move in the opposite direction of the ion gradient.
When a virus has a broad host range
A. it can infect many different species. B. it can infect many different cell types. C. it does not require close contact to infect a new host. D. it can infect many cell types or species. E. the species that the virus can infect are spread over a large geographic distance, potentially causing pandemics.