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DNA Structure and Replication

DNA Structure and Replication
If one cell has AT contents 40%, what will be the percentage of Guanine residue?

Guanine residue can not be calculated
15%
60%
30%

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

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

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DNA Structure and Replication
In DNA double helix, the two DNA chains are held together by

ionic bonds between the pair of bases
hydrogen bonds between the pair of bases
covalent bonds between the pair of bases
None of these

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DNA Structure and Replication
Proteins involved in opening a replication bubble are

DNA helicases
ligase
DNA topoisomerase
single stranded binding proteins

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

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

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DNA Structure and Replication
An RNA primer is synthesized by

DNA helicases
DNA topoisomerase
primase
ligase

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