A codon consists of three nitrogenous bases and there are four kind of bases in nucleic acid altogether. How many codons will be there?

(1)60

(2)4³

(3)34

(4)46

The main enzyme for DNA replication is

(1)DNA-dependent RNA polymerase

(2) RNA-dependent DNA polymerase

(3) DNA-dependent DNA polymerase

(4) RNA-dependent RNA polymerase

The energy for the DNA replication comes from

(1)Deoxyribonucleosides triphosphates

(2) Deoxyribonucleotides triphosphates

(3) Deoxyribonucleosides

(4) phosphorylation of ATP

Which of the following is incorrect for DNA polymerase?

1. template dependent enzyme

2. highly efficient enzyme

3. high degree of accuracy

4. template independent enzyme

which of the following purposes are not served by Deoxyribonucleoside triphosphates

(1) act as substrate

(2)act as energy source for replication

(3)act as enzyme cofactors

(4)act same as ATP

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

(1)replication centre

(2)replication opening

(3)replication fork

(4)duplication fork

The template of DNA on which discontinuous replication occurs has polarity

(1)5’to 3’

(2)3’ to 5’

(3)both a and b

(4)None of these

The discontinuously synthesised fragments are joined later by

(1)DNA polymerase III

(2)DNA ligase

(3)DNA gyrase

(4)DNA polymerase I

In eukaryotes, the replication of DNA takes place

(1) at S-phase of the cell cycle

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

(3) at M phase

(4)Both a and b

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

(1) chromosomal aberration

(2) polyploidy

(3) chromosomal anomaly

(4) Both b and c