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DNA Structure and Replication

DNA Structure and Replication
In sperm heads, DNA is particularly highly condensed and the histones are replaced with small basic protein called

All of these
purines
pyrimidines
protamines

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DNA Structure and Replication
DNA polymerases I also has

5'-3' exonuclease activity
both (a) and (b)
5'-3' endonuclease activity
3'-5'exonuclease activity

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DNA Structure and Replication
Overwinding or overtightening of DNA during replication is caused and removed by

DNAb, DNA polymerase
DNAb, gyrase
DNAa, gyrase
Single stranded protein, DNAa

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DNA Structure and Replication
Which of the following is an active site on its single polypeptide chain for DNA Polymerase I?

5' → 3' polymerase
5' → 3' exonuclease
3' → 5' exonuclease
All of these

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DNA Structure and Replication
An RNA primer is synthesized by

DNA topoisomerase
ligase
primase
DNA helicases

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DNA Structure and Replication
Proteins which help to open the double helix for DNA synthesis are

ligase
DNA helicases
single stranded binding proteins
DNA topoisomerase

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