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DNA, RNA and Experiments on Genetic Material, Class 12 Biology NCERT Solutions

1. There will be total 20 MCQ in this test.
2. Please keep a pen and paper ready for rough work but keep your books away.
3. The test will consist of only objective type multiple choice questions requiring students to mouse-click their correct choice of the options against the related question number.
4. No negative marking for incorrect choice.
5. Please click on “Finish the Test” when you want to exit.
6. All the best – Happy Studying

1. Who among the following scientists had no contribution in the development of the double helix model for the structure of DNA?
 
 
 
 

Question 1 of 20

2. DNA has genetic properties was revealed for the first time by
 
 
 
 

Question 2 of 20

3. The beginning of understanding genetic transformation in bacteria was made by
 
 
 
 

Question 3 of 20

4. DNA contains nucleobases, sugar and phosphate. Removal of which among these from a DNA sample will not significantly affect the length of DNA?
 
 
 
 

Question 4 of 20

5. According to Chargaff’s rule, which one is correct?
 
 
 
 

Question 5 of 20

6. Whose experiments cracked the DNA and discovered unequivocally that a genetic code is a triplet?
 
 
 
 

Question 6 of 20

7. In Hershey and Chase experiments, radioactive 32P was used to culture bacteriophages which resulted in radioactive
 
 
 
 

Question 7 of 20

8. Which of the following is a structural subunit of DNA?
 
 
 
 

Question 8 of 20

9. Which of the following are the functions of RNA?
 
 
 
 

Question 9 of 20

10. While analysing the DNA of an organism, a total number of 5386 nucleotides were found out of which the proportion of different bases were Adenine = 29%, Guanine = 17%, Cytosine = 32% and Thymine = 17%. Considering the Chargaff’s rule, it can be concluded that
 
 
 
 

Question 10 of 20

11. Nitrogenous bases present in DNA:
 
 
 
 

Question 11 of 20

12. Beadle and Tatum showed that each kind of mutant bread mould they studied lacked a specific enzyme. Their experiments demonstrated that
 
 
 
 

Question 12 of 20

13. A typical nucleosome contains
 
 
 
 

Question 13 of 20

14. DNA nucleotides are attached by
 
 
 
 

Question 14 of 20

15. In the DNA molecule,
 
 
 
 

Question 15 of 20

16. Retroviruses have genetic material
 
 
 
 

Question 16 of 20

17. If the percentage of cytosine is 18%, then the percentage of adenine will be
 
 
 
 

Question 17 of 20

18. Uracil is present in RNA at the place of
 
 
 
 

Question 18 of 20

19. The genetic material of a viroid is
 
 
 
 

Question 19 of 20

20. The net electric charge on DNA and histones is
 
 
 
 

Question 20 of 20