The discontinuously synthesized DNA fragments are later joined by:

The discontinuously synthesised fragments are joined later by

(1)DNA polymerase III

(2)DNA ligase

(3)DNA gyrase

(4)DNA polymerase I

Isotopes used in proving semiconservative replication of DNA were:

(1) ¹⁴N ¹⁴C            

(2) ¹⁴N ¹⁵N            

(3) ¹⁴N ³¹P             

(4) ¹⁴C ³¹P

Any mistakes during DNA replication by the enzyme would result into:

Distribution of newly synthesized DNA in the chromosomes is by semi-conservative means is experimentally shown by Taylor et al by using

1. Radioactive adenosine 

2. Radioactive thymidine

3. Radioactive guanosine 

4. Radioactive cytidine

The experimental proof for semiconservative replication of DNA was first shown in a:

1. Fungus

2. Bacterium

3. Plant

4. Virus

What is/are the role(s) of deoxyribonucleoside
triphosphates during DNA replication?

A. Act as substrate.
B. Catalyse the polymerisation of ribonucleic acid.
C. Provide energy for polymerisation reaction.

1. A only

2. B only

3. A and B

4. A and C

The DNA dependent DNA polymerases catalyze:

1. Only in 3'-5' direction

2. Only in 5'-3' direction

3. In both directions

4. In neither directions

DNA polymerase:
A. Is the main enzyme for RNA synthesis
B. Is DNA dependent DNA polymerizing enzyme
C. Is a highly efficient enzyme
D. Is catalyzes a reaction with a high degree of accuracy
(1) C, D             

(2) A, B, C, D               

(3) B, C, D             

(4) A, B, C

Which non-radioactive isotope was used by Meselson and Stahl to label DNA in their experiment?

\(1.\ {}^{35}S\)

\(2.\   {}^{15} N\)

\(3.{}^{32} P\)

\(4.\   N o n e\)