Molecular Basis Of Inheritance MCQ

Genes are the unit of heredity. They are present on the chromosomes that make up the DNA. DNA contains all the genetic information that is passed on from one generation to another. This forms the molecular basis of inheritance. Given below are Molecular Basis of Inheritance MCQ to analyse your understanding on the topic. The answers are also provided for your reference.

MCQs on Molecular Basis of Inheritance

1. The nucleic acid synthesis takes place in

  1. 3’-5’ direction
  2. 5’-3’ direction
  3. Both ways
  4. Any direction

2. What is the nature of the strands of the DNA duplex?

  1. Anti-parallel and complementary
  2. Identical and complementary
  3. Anti=parallel and non-complementary
  4. Dissimilar and non-complementary

Also read: DNA structure

3. Hershey and Chase’s experiment was based on the principle

  1. Transformation
  2. Translation
  3. Transduction
  4. Transcription

Also read: Hershey and Chase Experiment

4. AUG stands for

  1. Alanine
  2. Methionine
  3. N-formyl methionine
  4. Glycine

5. The reason behind the anti-parallel strand of DNA is

  1. Hydrogen bond
  2. Ionic bond
  3. Phosphodiester bond
  4. Disulphide bond

6. In a transcription unit, the promoter is located towards

  1. 5’end of the structural gene
  2. 3’end of the structural gene
  3. 5’end of the template strand
  4. 3’end of the template strand

Also read: Transcription

7. The primer in DNA replication is

  1. Small ribonucleotide polymer
  2. Helix destabilizing protein
  3. Small deoxyribonucleotide polymer
  4. Enzyme joining nucleotides of new strands

8. Genetic information is transferred from nucleus to cytoplasm through

  1. RNA
  2. Anticodon
  3. DNA
  4. Lysosomes

Also read: RNA

9. The enzyme involved in transcription

  1. DNA Polymerase I
  2. DNA Polymerase III
  3. RNA Polymerase
  4. DNA Polymerase II

10. Non-sense codons participate in

  1. Releasing t-RNA from polynucleotide chain
  2. Formation of unspecified amino acids
  3. Terminating message of gene-controlled protein synthesis
  4. Conversion of sense DNA into non-sense DNA

11. The proofreading enzyme in DNA replication is

  1. Primase
  2. DNA Polymerase I
  3. Ligase
  4. DNA Polymerase II

Also read: DNA Replication

12. Select a ribozyme

  1. Peptidyl transferase
  2. Helicase
  3. Ribonuclease-P
  4. Both (a) and (c)

13. Which step does not occur in translation?

  1. Replication
  2. Termination
  3. Elongation
  4. Initiation

Also read: Protein Synthesis

14. Select the incorrectly matched pairs

  1. Purines – Nitrogenous bases cytosine, thymine and uracil
  2. Recombinant DNA – DNA formed by joining the DNA segments from two different sources
  3. r-RNA – RNA found in ribosomes
  4. ATP – The energy carrying compound in the cell

15. The energy source for the elongation process is

  1. Creatine-PO4
  2. GTP
  3. ATP
  4. All of the above

16. The anticodon of initiation codon for protein synthesis is

  1. UUU
  2. AUG
  3. UAC
  4. CAU

Also read: Genetic Code

17. In lac-operon, which protein is not regulated by the repressor?

  1. Galactosidase
  2. Lactose Permease
  3. Tryptophan
  4. Transacetylase

Also read: Lac-operon

18. Which enzyme is not produced during lactose catabolism by E.coli?

  1. -galactosidase
  2. Lactose Permease
  3. Thiogalactoside transacetylase
  4. Lactose dehydrogenase

19. The eukaryotic replication of DNA is

  1. Bidirectional with many origins
  2. Unidirectional with many origins
  3. Bidirectional with single origin
  4. Unidirectional with single origin

20. The amino acid coded by 3 codons is

  1. Proline
  2. Isoleucine
  3. Tryptophan
  4. Serine

Also read: Amino acids

Answer Keys

1-2 2-1 3-3 4-2 5-3 6-4 7-1 8-1 9-3 10-3
11-2 12-4 13-1 14-1 15-2 16-3 17-3 18-4 19-1 20-2

For more Molecular Basis Of Inheritance MCQs or other related topics, explore BYJU’S Biology.

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