Once the pattern found after one round of replication was observed, Meselson and Stahl could be confident of which of the following conclusions?
1. Replication is semi-conservative.
2. Replication is not dispersive.
3. Replication is not semi-conservative.
4. Replication is not conservative.

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The main enzyme for DNA replication is

(a)DNA-dependent RNA polymerase

(b) RNA-dependent DNA polymerase

(c) DNA-dependent DNA polymerase

(d) RNA-dependent RNA polymerase

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The energy for the DNA replication comes from

(a)Deoxyribonucleosides triphosphates

(b) Deoxyribonucleotides triphosphates

(c) Deoxyribonucleosides

(d) phosphorylation of ATP

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Which of the following is incorrect for DNA polymerase?

(a)template dependent enzyme

(b)highly efficient enzyme

(c)high degree of accuracy

(d)template independent enzyme

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which of the following purposes are not served by Deoxyribonucleoside triphosphates

(a) act as substrate

(b)act as energy source for replication

(c)act as enzyme cofactors

(d)act same as ATP

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The small opening of the DNA helix where replication occurs is known as

(a)replication centre

(b)replication opening

(c)replication fork

(d)duplication fork

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The template of DNA on which discontinuous replication occurs has polarity

(a)5’to 3’

(b)3’ to 5’

(c)both a and b

(d)None of these

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The discontinuously synthesised fragments are joined later by

(a)DNA polymerase III

(b)DNA ligase

(c)DNA gyrase

(d)DNA polymerase I

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In eukaryotes, the replication of DNA takes place

(a) at S-phase of the cell cycle

(b)before G2 and after G1phase of the cell cycle

(c) at M phase

(d)Both a and b

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If cell division wouldn’t occur after DNA replication then cell will have

(a) chromosomal abberation

(b)polyploidy

(c)chromosomal anomaly

(d)Both b and c

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