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ASU BIO 340 EXAM 3 QUESTIONS AND ANSWERS 2024
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ASU BIO 340 EXAM 3 QUESTIONS AND ANSWERS 2024
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ASU BIO 340 EXAM 3 2024ANSWER ALL QUESTIONS IN THIS SECTION
QUESTION 1
Which of the following tends to loosen the interaction between DNA and histones?
A. Acetylation of histone tails B. Deacetylation of histone tails - ANSWERS-A.
Acetylation of histone tails
QUESTION 2
Which of the following regulatory sequences may be located tens of thousands of
nucleotides away from the genes they regulate?
A. Core promoters B. Enhancers C. Proximal elements D. TATA boxes -
ANSWERS-B. Enhancers
QUESTION 3
Which of the following enzymes can slide a histone octamer to a different position
on a eukaryotic chromosome?
A. Chromatin modification complex B. Histone acetyltransferase C.
Topoisomerase D. Chromatin remodeling complex - ANSWERS-D. Chromatin
remodeling complex
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PAGE 1
, ASU BIO 340 EXAM 3 2024
QUESTION 4
Which regulation of gene expression mechanism is not found in eukaryotes?
A. Different strength promoters B. Activator binding to DNA C. Repressor binding
to operator D. Alternative splicing - ANSWERS-C Explanation: Repressors bind to
silencers in eukaryotes (operators specific to prokaryotes)
QUESTION 5
Which regulation of gene expression mechanism is not found in prokaryotes? A.
Different strength promoters B. Activator binding to DNA C. Repressor binding to
operator D. Alternative splicing - ANSWERS-D Explanation: RNA polymerase
binding in prokaryotes - will have promoters of differing strengths, may have very
strong or slightly weaker affinity to sigma factor. Activator binding to DNA in
both pro and eukaryotes; if to enhancer, that is specific to eukaryotes. Prokaryotes
don't do splicing at all (thus, alternative splicing is not possible in prokaryotes.
QUESTION 6
What type of mutation is seen here? Wild type: 5'-TAC AAA ATA CAG CGG-3'
Mutation: 5'-TAC AAG ATA CAG CGG-3' A. Missense B. Nonsense C. Silent D.
Frameshift - ANSWERS-C Explanation: AAA would normally encode a Leu.
AAG would also encode a Leu
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