Molecular Basis of Inheritance MCQ Questions for Class 12 Biology Chapter 6 with Answers

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NCERT MCQ Chapters for Class 12 Biology


Q1. At time of organogenesis genes regulate the process at different levels and at different time due to

(A) Promoter
(B) Exon
(C) Intron
(D) Regulator


(B) Exon


Q2. The human chromosome with the highest and least number of genes in them are respectively

(A) chromosome 21 and Y
(B) chromosome 1 and X
(C) chromosome 1 and Y
(D) chromosome X and Y.


(C) chromosome 1 and Y


Q3. Amino acid acceptor end of tRNA lies at

(A) 5’ end
(B) 3’ end
(C) T VC loop
(D) DHUloop.


(B) 3’ end


Q4. The portion of DNA which contains information for an entire polypeptide is called

(A) Operon
(B) Recon
(C) Muton
(D) Cistron


(D) Cistron


Q5. One turn of the helix in p-from DNA is approximately:

(A) 20 Å
(B) 2 nm
(C) 20 nm
(D) 34 nm


(D) 34 nm


Q6. In the lac operon of E.coli, the i gene codes for

(A) inducer
(B) repressor
(C) lactase
(D) β-galactosidase


(B) repressor


Q7. Which of the following steps in transcription is catalysed by RNA polymerase?

(A) Initiation
(B) Elongation
(C) Termination
(D) All of the above.


(B) Elongation


Q8. The net electric charge on DNA and histones is :

(A) both positive
(B) both negative
(C) negative and positive, respectively
(D) zero


(C) negative and positive, respectively


Q9. The net electric charge on DNA and histone, is

(A) positive, negative
(B) negative, positive
(C) negative, negative
(D) positive, positive.


(B) negative, positive


Q10. During splicing axon attached and inducer enzyme for reaction:

(A) RNA Ligase
(B) RNA Catalase
(C) RNA permease
(D) RNA poloymerase


(B) RNA Catalase


Q11. The strand of DNA that forms mRNA is called?

(A) Lagging strand
(B) Coding strand
(C) Antisense strand
(D) Template strand


(D) Template strand


Q12. The first genetic material could be

(A) protein
(B) cabohydrates
(C) DNA
(D) RNA.


(D) RNA.


Q13. In some viruses, DNA is synthesised by using RNA as template. Such a DNA is called

(A) A – DNA
(B) B – DNA
(C) cDNA
(D) rDNA.


(C) cDNA


Q14. Which of the following important biochemical reactions in living systems is catalyzed by a ribozyme?

(A) Formation of peptide bond
(B) Repair of DNA
(C) Electron transfer chain
(D) Organization of MTOC during cell division


(A) Formation of peptide bond


Q15. A ribotide is made up of:

(A) Ribose + Phosphate + Uracil
(B) Deoxribose + Uracil + Phosphate
(C) Thymine + Ribose + Phosphate
(D) Deoxyribpse + Phosphate + Adenine


(A) Ribose + Phosphate + Uracil


Q16. Eukaryotic RNA polymerase III catalyses the synthesis of

(A) mRNA
(B) rRNA
(C) hnRNA
(D) tRNA


(D) tRNA


Q17. Who amongst the following scientists had no contribution in the development of the double helix model for the structure of DNA?

(A) Rosalind Franklin
(B) Maurice Wilkins
(C) Erwin Chargaff
(D) Meselson and Stahl.


(D) Meselson and Stahl.


Q18. The fact that a purine base always paired through hydrogen bonds with a pyrimidine base leads to, in the DNA double helix :

(A) the antiparallel nature
(B) the semiconservative nature
(C) uniform width throughout DNA
(D) uniform length in all DNA.


(C) uniform width throughout DN


Q19. In E.coli, the lac operon gets switched on when

(A) lactose is present and it binds to the », repressor.
(B) repressor binds to operator.
(C) RNA polymerase binds to the operator.
(D) lactose is present and it binds to RNA polymerase.


(A) lactose is present and it binds to the », repressor.


Q20. In DNA helix:

(A) Quadrate structure
(B) Polarity
(C) Antiparallel Polarity
(D) Disuiphide bond


(C) Antiparallel Polarity


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