1. regulation of gene expression may cause production of different proteins in a
ID: 175451 • Letter: 1
Question
1. regulation of gene expression may cause production of different proteins in
a. cells in different tissues of the same individual.
b. cells which have the exact same base sequence.
c. cells at different stages of the life cycle in the same individual.
d. cells with the same genotype which are in different environments.
e. all of the above.
2. In Eukaryotes, regulation of gene expression:
a. involves operons.
b. occurs at multiple stages of expression.
c. induces or represses transcription of polycistronic mRNA.
d. coordinately regulates multiple genes which share a promoter.
e. involves a repressor protein, which may bind to the operator region.
f. all of the above.
3. In a newly-formed polypeptide, the last ten amino acids are all incorrect. Which of the following is most likely responsible for this error?
a. Base modifications
b. Proofreading failure
c. Exposure to UV light
d. Slippage of the Polymerase
e. Failure of nucleotide excision repair
4. Thymine dimers:
may be caused by UV light
generally result in a mis-sense mutation
may be corrected by a nucleotide excision repair
results when two thymines on the same strand bind together
all of the above
all of the above except b
all of the above except c
5. Mutations in a haploid genome:
a. are expressed only if the mutation is dominant
b. are generally recognized only in the next generation
c. can be detected in the generation in which the mutation occurred
d. are masked by an alternate allele on the homologous chromosome
Explanation / Answer
1). c. cells at different stages of the life cycle in the same individual.
2). a. involves operons.
3). a. Base modifications
4). may be caused by UV light
5).c. can be detected in the generation in which the mutation occurred
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