Exercise: Dna Structure And Replication

Questions for: Dna Structure And Replication

In sperm heads, DNA is particularly highly condensed and the histones are replaced with small basic protein called
A:
protamines
B:
purines
C:
pyrimidines
D:
all of the above
Answer: A
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E.coli DNA polymerases II and III lack
A:
5' → 3' exonuclease activity
B:
5' → 3' endonuclease activity
C:
partially 5' → 3' exonuclease activity
D:
partially 5' → 3' endonuclease activity
Answer: A
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Klenow fragment without free nucleotides exhibits
A:
exonuclease activity
B:
endonuclease activity
C:
nickase activity
D:
no activity
Answer: A
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DNA helicase is used to
A:
unwind the double helix
B:
interact the double helix closely
C:
break a phosphodiester bond in DNA strand
D:
none of the above
Answer: A
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The higher order structure of DNA shows symmetry, whereas the higher order structures of most proteins do not. Why isn't protein shape more regular like DNA?
A:
DNA has one main function in cells whereas proteins have many.
B:
The many different amino acid R groups on proteins confer many different shapes.
C:
Some S amino acids cause proteins to bend; others cause protein to flatten.
D:
All of the above
Answer: D
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