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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
protamines
pyrimidines

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DNA Structure and Replication
DNAs when charged, migrate in a gel towards the

will not migrate
none of these
positive pole
negative pole

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DNA Structure and Replication
DNA gyrase in E. coli

performs the same function as helicase in eukaryotes
is required only at the oriC site
adds positive supercoils to chromosomal DNA
can be inhibited with antibiotics

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DNA Structure and Replication
Number of times the two DNA strands are interwined in circular DNA and is known as

twisting number
linking number
helix frequency
none of these

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DNA Structure and Replication
Replication in E. coli is initiated by the generation of short RNA primers using

primase
reverse transcriptase
RNA polymerase
both (a) and (b)

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DNA Structure and Replication
What does ligase do during replication of DNA?

Synthesizes the lagging strand
Joins nicks in DNA strands
Digests mRNA when it is no longer needed
Makes copies of mRNA from DNA

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