Which of the following enzymes does not possess a topoisomerase activity? O A. D

Question

Which of the following enzymes does not possess a topoisomerase activity? O A. DNA gyrase O B. DNA Polymerase O C. DNA helicase 0 D. Topoisomerase! Reset Selection 1.0 Points Question 4 of 5 Which of the following was NOT an experiment that helped to elucidate the mechanism of DNA replication? O A. Messelson and Stahl experiment with labeled DNA and ultracentrifugation 0 B. Taylor experiment with tritiated-dTTP incorporation into eukaryotic chromosomes O C. Cairns experiment with tritiated-dTTP incorporation into prokaryotic chromosomes O D. Hershey and Chase experiment with radiolabeled bacteriophage Reset Selection

Explanation / Answer

Answer 1

Option B- DNA polymerase

As all the enzymes except DNA Polymerase, help in unwinding of DNA. DNA polymerase only have such activities-

5'-3' polymerase activity

3'-5' exonuclease activity

5'-3' exonuclease activity

Answer 2-

Option D

Hershey and Chase experiment with radiolabeled bacteriophage gives evidence that DNA is the genetic material. Rest all three experiments gives an idea about the mechanism of DNA replication.

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