The cancer gene ras produces mRNA containing an extra exon that includes a number of UAA codons. Cancer cells produce ras mRNA missing this exon. This mistake most likely is due to a mistake by

A) a chemical mutagen.
B) DNA polymerase.
C) photolyases.
D) snRNPs.
E) UV radiation.


D

Biology & Microbiology

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Human saliva contains which of the following enzymes?

a. aminopeptidase b. amylase c. chymotrypsin d. pepsin e. trypsin

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What will be an ideal response?

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The phase before onset of DNA replication is the

A) G1 phase B) G2 phase C) S phase D) M phase

Biology & Microbiology

The capacity for some tRNAs to recognize more than one codon in mRNA is explained by a phenomenon called

a. redundancy. b. wobble. c. a reading frameshift. d. degeneracy.

Biology & Microbiology