The LexA protein is:

A. the repressor of the SOS response.
B. the coprotease for the cleavage of RecA protein.
C. a DNA repair enzyme.
D. a regulatory protein for the lac operon.


A

Biology & Microbiology

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Although extinction is a natural process, current extinctions are of concern to environmentalists because _____

A) more animals than ever before are going extinct B) most current extinctions are caused by introduced species C) the rate of extinction is higher than background extinction rates D) current extinction is primarily affecting plant diversity

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Substitution of one base pair for another in a coding region of a gene can result in a ____ mutation

where the changed codon codes for a different amino acid than was previously coded for.

a. missense b. chromosomal c. frameshift d. silent e. nonsense

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Oxidation-Reduction Reactions

What will be an ideal response?

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When the intracellular level of lactose drops, the repressor protein binds to the operator and shuts

down translation. __________________ Indicate whether the statement is true or false.

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