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

MCQ’s For All Chapters – Biology Class 12th

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?

Meselson and Stahl

Rosalind Franklin

Erwin Chargaff

Maurice Wilkins

Your comments:

Question 1 of 20

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

Chargaff

Griffith

Avery

Wilkins

Your comments:

Question 2 of 20

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

Hershey and Chase

Watson and Crick

Frederick Griffith

T. H. Morgan

Your comments:

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?

Nucleobases

Sugar

Phosphate

None of the above

Your comments:

Question 4 of 20

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

[A] + [T] = [G] + [C]

[A] + [C] = [G] + [T]

[A] + [G] = [T] + [C]

All of these

Your comments:

Question 5 of 20

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

Nirenberg and Matthaei

Hershey and Chase

Beadle and Tatum

Morgan and Sturtevant

Your comments:

Question 6 of 20

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

Protein capsule of bacteriophage

Viral DNA

Bacterial capsule

Viral proteins

Your comments:

Question 7 of 20

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

Nucleotides

Carbohydrate

Protein

RNA

Your comments:

Question 8 of 20

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

It is a carrier of genetic information from DNA to ribosomes synthesising polypeptides.

It carries amino acids to ribosomes.

It is a constituent component of ribosomes.

All of the above.

Your comments:

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

It is a double-stranded linear DNA.

It is single-stranded DNA.

No conclusion can be drawn.

It is a double-stranded circular DNA.

Your comments:

Question 10 of 20

11. Nitrogenous bases present in DNA:

Adenine, guanine, cytosine, thymine

Guanine, uracil

Adenine, guanine, cytosine, uracil

Adenine, thymine, uracil

Your comments:

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

Genes carry information for making proteins.

Enzymes are required to repair damage.

Cells need specific enzymes in order to function.

Genes are made up of DNA.

Your comments:

Question 12 of 20

13. A typical nucleosome contains

100 bp of DNA helix

400 bp of DNA helix

200 bp of DNA helix

300 bp of DNA helix

Your comments:

Question 13 of 20

14. DNA nucleotides are attached by

Van der Waals bond

Electrovalent bond

Hydrogen bond

Covalent bond

Your comments:

Question 14 of 20

15. In the DNA molecule,

There are two strands which run parallel in the 5'-3' direction.

The total amount of purine nucleotides and pyrimidine nucleotides is not always equal.

Proportion of adenine in relation to thymine varies with the organism.

There are two strands which run antiparallel - one in 5'-3' direction and other in 3'-5' direction.

Your comments:

Question 15 of 20

16. Retroviruses have genetic material

DNA only

Either DNA or RNA only

DNA or RNA only

RNA only

Your comments:

Question 16 of 20

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

64%

32%

23%

36%

Your comments:

Question 17 of 20

18. Uracil is present in RNA at the place of

Adenine

Thymine

Guanine

Cytosine

Your comments:

Question 18 of 20

19. The genetic material of a viroid is

Protein

DNA

Carbohydrate

RNA

Your comments:

Question 19 of 20

20. The net electric charge on DNA and histones is

Negative and positive, respectively

Both negative

Both positive

Zero

Your comments:

Question 20 of 20

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