In This Post we are  providing Chapter-6 Molecular Basis of Inheritance  NCERT MCQ for Class 12 Biology which will be beneficial for students. These solutions are updated according to 2021-22 syllabus. These MCQS  can be really helpful in the preparation of Board exams and will provide you with a brief knowledge of the chapter.

NCERT MCQ ON MOLECULAR BASIS OF INHERITANCE

1. The nucleic acid synthesis takes place in
(a) 3’-5’ direction
(b) 5’-3’ direction
(c) Both ways
(d) Any direction

Answer: (b) 5’-3’ direction

2. What is the nature of the strands of the DNA duplex?
(a) Anti-parallel and complementary
(b) Identical and complementary
(c) Anti=parallel and non-complementary
(d) Dissimilar and non-complementary

Answer: (a) Anti-parallel and complementary

3. Hershey and Chase’s experiment was based on the principle
(a) Transformation
(b) Translation
(c) Transduction
(d) Transcription

Answer: (c) Transduction

4. AUG stands for
(a) Alanine
(b) Methionine
(c) N-formyl methionine
(d) Glycine

Answer: (b) Methionine

5. The reason behind the anti-parallel strand of DNA is
(a) Hydrogen bond
(b) Ionic bond
(c) Phosphodiester bond
(d) Disulphide bond

Answer: (a) Hydrogen bond

6. In a transcription unit, the promoter is located towards
(a) 5’end of the structural gene
(b) 3’end of the structural gene
(c) 5’end of the template strand
(d) 3’end of the coding strand

Answer: (a) 5’end of the structural gene

7. The primer in DNA replication is
(a) Small ribonucleotide polymer
(b) Helix destabilizing protein
(c) Small deoxyribonucleotide polymer
(d) Enzyme joining nucleotides of new strands

Answer: (a) Small ribonucleotide polymer

8. Genetic information is transferred from nucleus to cytoplasm through
(a) RNA
(b) Anticodon
(c) DNA
(d) Lysosomes

Answer: (a) RNA

9. The enzyme involved in transcription
(a) DNA Polymerase I
(b) DNA Polymerase III
(c) RNA Polymerase
(d) DNA Polymerase II

Answer: (c) RNA Polymerase

10. Non-sense codons participate in
(a) Releasing t-RNA from polynucleotide chain
(b) Formation of unspecified amino acids
(c) Terminating message of gene-controlled protein synthesis
(d) Conversion of sense DNA into non-sense DNA

Answer: (c) Terminating message of gene-controlled protein synthesis

11. The proofreading enzyme in DNA replication is
(a) Primase
(b) DNA Polymerase I
(c) Ligase
(d) DNA Polymerase II

Answer: (b) DNA Polymerase I

12. Select a ribozyme
(a) Peptidyl transferase
(b) Helicase
(c) Ribonuclease-P
(d) Both (a) and (c)

Answer: (d) Both (a) and (c)

13. Which step does not occur in translation?
(a) Replication
(b) Termination
(c) Elongation
(d) Initiation

Answer: (a) Replication

14. Select the incorrectly matched pairs
(a) Purines – Nitrogenous bases cytosine, thymine and uracil
(b) Recombinant DNA – DNA formed by joining the DNA segments from two different sources
(c) rRNA – RNA found in ribosomes
(d) ATP – The energy-carrying compound in the cell

Answer: (a) Purines – Nitrogenous bases cytosine, thymine and uracil

15. The energy source for the elongation process is
(a) Creatine-PO₄
(b) GTP
(c) ATP
(d) All of the above

Answer: (b) GTP

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