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

Which principle govern the principle of transcription?

(a)Cleavage of phosphodiester bond

(b)Phosphorylation

(c)Complementarity

(d)duplication

Which of the following statement is not true ?

(1)In replication the total DNA of an organism gets duplicated

(2)In transcription complete one strand of the DNA gets copied

(3) In transcription only a segment of only one strands of the DNA gets copied

(4)Both b and c

Why both the strands of DNA are not copied during transcription because

(1)RNA molecules with different sequences will be produced and hence proteins with different sequences will be produced.

(2)double stranded RNA molecules will be produced that would prevent translation of dsRNA

(3)cell will fail to produce proteins as no single stranded RNA is present

(4) All of the above

 Which of the following is not a unit of transcription unit

(1)A promoter

(2)The structural gene

(3)A terminator

(4)A operator