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DNA Genetic Material Online Test Question Answer

Test Name DNA Genetic Material Test
Subject Biology
Test Type Mcqs
Total Question 20
Total Marks 40
Total Time 20
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DNA Genetic Material Online Test Question Answer Quiz


1. E.coli cells that had been cultured in a light medium containing 14N-ammonium chloride as the sole nitrogen source were transferred to a heavy medium containing 15N-ammonium chloride. After three generations of growth in the heavy medium, what will be the proportion of dual light strands (LL), dual heavy strands (HH) and hybrid light-plus-heavy strands (LH) in the DNA duplexes?

Question 1 of 20

2. The fact that DNA polymerase I from E. coli has a 5’-3’ exonuclease activity’

Question 2 of 20

3. Prokaryotic plasm ids can replicate in yeast cells if they contain a cloned yeast …

Question 3 of 20

4. DNA ligase of E.coli requires which of the following cofactors?

Question 4 of 20

5. During DNA replication, the synthesis of the leading strand occurs in the 5’→ 3’; direction along with the movement of the replication fork. Which one of the following statements is true about the synthesis of the lagging strand?

Question 5 of 20

6. Which of the following statements about DNA polumerase I is correct?

Question 6 of 20

7. Which enzyme removes the RNA primer and fills in deoxyribonucleorides in prokaryotic replicons?

Question 7 of 20

8. Which of the following features of transcription is similar to that of replication?

Question 8 of 20

9. Characteristic unique in DNA is:

Question 9 of 20

10. Which of the following activities is typical of histones during replication of eukaryotic DNA?

Question 10 of 20

11. The essential initiator protein at the E. coli origin of replication is …

Question 11 of 20

12. A solution contains DNA polymerase, I, Mg²⁺ salts of dATP, dGTP, dCTP, and dTTP, and an appropriate buffer. Which of the following DNA molecules would serve as a template for DNA synthesis when added to this solution.

Question 12 of 20

13. Correct statements describing DNA polymerase I include which of the following?

Question 13 of 20

14. Which phase would a cell enter if it was starved of mitogens before the R point?

Question 14 of 20

15. Approximately how many Okazaki fragments are synthesized during one round of the E. coli genome?

Question 15 of 20

16. DNA replication under going in an E. coli cell resulted into two  circular DNAs interlocked with each other; this may be due to a defective gene encoding:

Question 16 of 20

17. Which of the sequences listed below best describe the order in which the following enzymes participate in the replication of DNA in bacteria?

1) DNA polymerase I

2) 5’→3’ Exonuclease

3) DNA polymerase III

4) DNA ligase

5) Primase

Question 17 of 20

18. A bacterial culture growing in a medium containing 15NH4CI is switched to a medium containing 14NH4CI for three generations (resulting into eight fold increased in its population), what is the molar ratio of hybrid DNA (15N-14N) to light DNA (14N-14N) at this point?

Question 18 of 20

19. In prokaryotes, the lagging primers are removed by …

Question 19 of 20

20. Okazaki fragments are used to elongate:

Question 20 of 20


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