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Explain the mechanism of DNA repication ...

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.

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(a) Write the RNA strand transcribed from the above transcription unit along with its polarity. (b) Construct a complete transcription unit with promotor and terminator on the basis of the hypothetical template strand given below :

a) Construct a complete transcription unit with promoter and terminator on the basis of hypothetical template strand given below (b) Write the RNA strand transcribed from the above transcription unit along with its polarity