Transcription of the lac operon is most efficient when ____
a. cAMP levels are low
b. the CAP site of the promoter is not bound to cAMP
c. glucose is present and lactose is absent
d. lactose is present and glucose is absent
e. lactose and glucose are present
ANSWER: d
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Restriction enzymes
a. make staggered cuts. b. function only at "sticky ends." c. produce uniform lengths of DNA. d. function only in genetic laboratories. e. are fragments of DNA.
Individuals with blood type A have which blood antigen(s)?
What will be an ideal response?
Sulfur is
a. found in proteins but not nucleic acids b. found in bacteria but not viruses c. found in viruses but not bacteria d. found in nucleic acid but not proteins e. needed for bacteriophages to attach to bacteria
The portion of a molecule which elicits an immune response is called
A) a mosaic. B) a hapten. C) an epitope. D) an alloantigen.