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DNA Structure and Replication

DNA Structure and Replication
The enzyme responsible for breaking the hydrogen bonds, and thus separating the DNA strands during DNA synthesis is

DNA polymerase
strandase
none of these
helicase

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

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

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DNA Structure and Replication
What is the approximate size (in kb) of the E. coli genome?

3000 kilobase
5500 kilobase
4500 kilobase
6500 kilobase

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DNA Structure and Replication
DNA replication results in

two DNA molecules such that each one contains a strand of the original
one new DNA molecules 1 old molecule
one new molecule of RNA
two completely new DNA molecules

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DNA Structure and Replication
Which is the largest among the followings?

Phosphate
Nucleotide
Carbon
Nitrogenous base

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DNA Structure and Replication
An RNA primer is synthesized by

DNA helicases
ligase
DNA topoisomerase
primase

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