QUESTION 7 Which enzyme activity is responsible for proofreading the newly synth

Question

QUESTION 7 Which enzyme activity is responsible for proofreading the newly synthesized DNA strands? A. 5, to 3, polymerase activity OB.3 to 5' polymerase activity OC 5 to 3 exonuclease activity OD 3 to5 exonuclease activity QUESTION 8 Which of the following is shared between prokaryotic and eukaryotic DNA replication? A. Semi-conservative mode C. Leading and lagging strands All of the above. QUESTION 9 Why don't prokaryotic genomes have telomeres? Because they are single stranded OB. Because they are smaller than eukaryotic chromosomes Because they are linear OD Because they are circular QUESTION 10 Does eukaryotic chromosome replication generate Okazaki fragments? OA Yes, but as part of the leading strands. OB. Yes, in the same way as in prokaryotic DNA replication. Yes, depending on the species. No.

Explanation / Answer

Question 7.

Answer is (A) 5' to 3' polymerase activity

Explanation. Synthesis of new DNA strands is carried out by enzyme DNA polymerase which has activity in only one 5' to 3' direction.

Question. 8.

In my opinion the answers should be option (D) all of these.

Explanation. Both eukaryote and prokaryotes replicate their DNA semi- conservatively

In both case DNA replication can be unidirectional or bidirectional

In both case there is leading and lagging strand.

Question 9.

Answer is (D) because they are circular.

Explanation.

Telomere are regions of repetitive nucleotide sequence at each end of a chromosome, which protects the end of the chromosome from deterioration or from fusion with neighbouring chromosome.

- as in prokaryotes DNA is circular it has no end. So it doesn't need telomere to protect its ends.

Question 10.

Answer is (B) yes, in the same way as in prokaryotic DNA replication.

Explanation . Okazaki fragments are synthesized on lagging strand.

It is synthesized in both eukaryote and prokaryotes.

Hope you got your answer.

Thanks.

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