Arrange in the proper sequence those events that take place in the lac operon as lactose is introduced to a bacterial culture.
A. Step 2
B. Step 1
C. Step 3
D. Step 4
A. Lactose binds to the repressor and prevents it from binding to the operator.
B. A regulator gene normally codes for a repressor that binds to the operator and prevents transcription.
C. RNA polymerase binds to a promoter on the DNA to begin RNA synthesis.
D. The structural genes are transcribed.
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Which of the following is technically not part of the genetic information of a transposable element?
A. Long-terminal repeats B. Inverted repeats C. Direct repeats D. Transposase
The changeover in production from IgM to IgG by an activated B cell is called a ________ event.
Fill in the blank(s) with the appropriate word(s).
For the light-independent reactions to continue, glyceraldehyde-3-phosphate must be converted into
A. ribulose. B. carbon dioxide. C. ATP. D. glucose.
Hormones are effective because they are
A. recognized by specific receptors. B. faster than nervous impulses. C. each effective on every cell in the body. D. produced by the body.