Discuss the role, the enzyme DNA ligase plays during DNA replication.

Explain the mechanism of DNA repication with the help of a replication fork. What role does the enzyme DNA-ligase play in a DNA replication fork ? OR Construct and label a transcription unit from which the RNA segment given below has been transcribed. Write the complete name of the enzyme that transcribed this RNA.

During replication of DNA

Draw a labelled schematic sketch of replication fork of DNA. Explain the role of the enzymes involved in DNA replication.

Draw a labelled schematic sketch of replication fork of DNA. Explain the role of the enzymes involved in DNA replication

DNA synthesis during replication is

What are DNA ligases?

The replication process involves the following steps: (I) The enzyme DNA-dependent DNA poly merases catalyse the polymerisation of DNA strand. (II) The lagging strand is synthesized in frag ments known as Okazaki fragments, which are later joined by the enzyme DNA Ligase. (III) The origin of replication serves as the recognition site for DNA polymerase and also it provides the site for attachment of RNA primer. (IV)The structural gene coding for a partic ular protein is flanked by the promoter and terminator. Choose the correct option:

(a) Name the stage in the cell cycle where DNA replication occurs. (b) Explain the mechanism of DNA replication. Highlight the role of enzymes in the process. (c) Why is DNA replication said to be semiconservative ?