Replication

Which of the following chemical substance is used as a source of nitrogen in the Meselson and Stahl’s experiment?

A DNA molecule having labelled thymidine in one of its strands is allowed to replicate in a radioactive medium. Calculate the number of strands with labelled thymine in the DNA after three successive divisions.

The addition of nucleotide during DNA replication is done by:

Meselson and Stahl used isotopes of which element?

Which one of the following will be the ratio of heavy, intermediate and light bands in Meselson and Stahl's experiment after two generations if $\mathrm{DNA}$ replication were conservative?

Which one of the following elements is not directly involved in transcription?

Role of E.coli in replication of DNA is
i. Semi-conservative replication was proved first
ii. Polymerises approximately $2000 \mathrm{bp}$ per second
iii. Replication time is $38$ minutes
iv. Length of DNA is $6.6\times {10}^9\mathrm{bp}$

The correct answer is:

With respect to DNA synthesis, identify the correct combination of statements.

I. Always the direction of DNA polymerization is $5^{\text{'}}\to 3^{\text{'}}$ when referring to the polarity of strand being synthesized.

II. DNA ligase forms hydrogen bonds between two newly synthesized DNA strands.

III. DNA polymerase on its own cannot initiate the process of replication.

IV. DNA polymerase can catalyze polymerization in both $5^{\text{'}}\to 3^{\text{'}}$ and $3^{\text{'}}\to 5^{\text{'}}$ directions.

Which one of the following statements is correct?

$\mathrm{DNA}$ strand separation enzyme

At the time of $\mathrm{DNA}$ replication template with polarity $5^{\text{'}}\to 3^{\text{'}},$ new strand synthesised:-

Okazaki fragments are :-

DNA polymerase is required for the synthesis of

How many times can DNA replicate in a life of a cell?

$\mathrm{\theta }$ (theta) replication of DNA is observed in which of the following?