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

Find here the NCERT chapter-wise Multiple Choice Questions from Class 12 Biology book Chapter 6 Molecular Basis of Inheritance with Answers Pdf free download. This may assist you to understand and check your knowledge about the chapters. Students also can take a free test of the Multiple Choice Questions of Molecular Basis of Inheritance. Each question has four options followed by the right answer. These MCQ Questions are selected supported by the newest exam pattern as announced by CBSE.

NCERT MCQ Chapters for Class 12 Biology

Q1. The human chromosome with the highest and least number of genes in them are respectively

(i) chromosome 21 and Y
(ii) chromosome 1 and X
(iii) chromosome 1 and Y
(iv) chromosome X and Y.

(iii) chromosome 1 and Y

Q2. The portion of DNA which contains information for an entire polypeptide is called

(i) Operon
(ii) Recon
(iii) Muton
(iv) Cistron

(iv) Cistron

Q3. In the lac operon of E.coli, the i gene codes for

(i) inducer
(ii) repressor
(iii) lactase
(iv) β-galactosidase

(ii) repressor

Q4. The net electric charge on DNA and histones is :

(i) both positive
(ii) both negative
(iii) negative and positive, respectively
(iv) zero

(iii) negative and positive, respectively

Q5. During splicing axon attached and inducer enzyme for reaction:

(i) RNA Ligase
(ii) RNA Catalase
(iii) RNA permease
(iv) RNA poloymerase

(ii) RNA Catalase

Q6. The first genetic material could be

(i) protein
(ii) cabohydrates
(iii) DNA
(iv) RNA.

(iv) RNA.

Q7. Which of the following important biochemical reactions in living systems is catalyzed by a ribozyme?

(i) Formation of peptide bond
(ii) Repair of DNA
(iii) Electron transfer chain
(iv) Organization of MTOC during cell division

(i) Formation of peptide bond

Q8. Eukaryotic RNA polymerase III catalyses the synthesis of

(i) mRNA
(ii) rRNA
(iii) hnRNA
(iv) tRNA

(iv) tRNA

Q9. The fact that a purine base always paired through hydrogen bonds with a pyrimidine base leads to, in the DNA double helix :

(i) the antiparallel nature
(ii) the semiconservative nature
(iii) uniform width throughout DNA
(iv) uniform length in all DNA.

(iii) uniform width throughout DNA

Q10. In DNA helix:

(i) Quadrate structure
(ii) Polarity
(iii) Antiparallel Polarity
(iv) Disuiphide bond

(iii) Antiparallel Polarity

Q11. The net electric charge on DNA and histones is

(i) both positive
(ii) both negative
(iii) negative and positive, respectively
(iv) zero.

(iii) negative and positive, respectively

Q12. Signaling between cells usually results in the activation of protein

(i) Kinases
(ii) Nucleases
(iii) Lipases
(iv) Proteases

(i) Kinases

Q13. Operon model for regulation of transcription was proposed by

(а) Meselson and Stahl
(ii) Jacob and Monod
(iii) Watson and Crick
(iv) Hershey and Chase

(ii) Jacob and Monod

Q14. Both deoxyribose and ribose belong to a class of sugars called :

(i) trioses
(ii) hexoses
(iii) pentoses
(iv) polysaccharides.

(iii) pentoses

Q15. Following is important in Ïranscription:

(i) DNA Methylase
(ii) CAAT Box
(iii) Promotar
(iv) DNA Polymerase

(i) DNA Methylase

Q16. In a DNA strand the nucleotides are linked together by

(i) glycosidic bonds
(ii) phosphodiester bonds
(iii) peptide bonds
(iv) hydorgen bonds.

(ii) phosphodiester bonds

Q17. In Hershey and Chase experiments, radioactive 32P was used to culture bacteriophages which resulted in radioactive

(i) Protein capsule of bacteriophage
(ii) Viral DNA
(iii) Bacterial capsule
(iv) Viral proteins

(ii) Viral DNA

Q18. The DNA site where DNA-dependent RNA- polymerase binds for transcription, is called

(i) operator
(ii) promotor
(iii) regulator
(iv) receptor

(ii) promotor

Q19. Who proved semiconservative mode of DNA replication for the first time in E. coli with the help of N15 heavy nitrogen isotope?

(i) Watson and Crick
(ii) Kornberg and Ochova
(iii) Messelson and Stahl
(iv) Luria and Delbruck

(iii) Messelson and Stahl

Q20. During DNA synthesis formed segment is:

(i) Polymerase fragment
(ii) RNA fragment
(iii) Okazaki fragment
(iv) RNA Primer

(iii) Okazaki fragment

Q21. Which of the following steps in transcription is catalysed by RNA polymerase ?

(i) Initiation
(ii) Elongation
(iii) Termination
(iv) All of the above

(iv) All of the above

Q22. Genetic information is carried out by long chain molecule made up of

(i) Nucleotides
(ii) Enzymes
(iii) Histone proteins
(iv) Amino acids

(i) Nucleotides

Q23. Discontinuous synthesis of DNA occurs in one strand, because

(i) DNA molecule being synthesised is very long.
(ii) DNA dependent DNA polymearse catalyses polymerisation only in one direction (5′ → 3′).
(iii) it is a more efficient process.
(iv) DNA ligase has to have a role.

(ii) DNA dependent DNA polymearse catalyses polymerisation only in one direction (5′ → 3′).

Q24. The first genetic material could be :

(i) protein
(ii) carbohydrates
(iii) DNA
(iv) RNA.

(iv) RNA.

Q25. DNA fragments are joined in a correct sequence by :

(i) DNA ligase
(ii) RNA polymerase
(iii) Helicase
(iv) DNA polymerase

(ii) RNA polymerase

Q26. Control of gene expression takes place at the level of

(i) DNA-replication
(ii) transcription
(iii) translation
(iv) none of the above.

(ii) transcription

Q27. The chromosomes in which centromere is situated close to one end are:

(i) Acrocentric
(ii) Telocentric
(iii) Sub-metacentric
(iv) Metacentric

(i) Acrocentric

Q28. In E.coli, the lac operon gets switched on when

(i) lactose is present and it binds to the », repressor.
(ii) repressor binds to operator.
(iii) RNA polymerase binds to the operator.
(iv) lactose is present and it binds to RNA polymerase.

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

Q29. Who amongst the following scientists had no contribution in the development of the double helix model for the structure of DNA?

(i) Rosalind Franklin
(ii) Maurice Wilkins
(iii) Erwin Chargaff
(iv) Meselson and Stahl.

(iv) Meselson and Stahl.

Q30. A ribotide is made up of:

(i) Ribose + Phosphate + Uracil
(ii) Deoxribose + Uracil + Phosphate
(iii) Thymine + Ribose + Phosphate
(iv) Deoxyribpse + Phosphate + Adenine

(i) Ribose + Phosphate + Uracil

Q31. In some viruses, DNA is synthesised by using RNA as template. Such a DNA is called

(i) A – DNA
(ii) B – DNA
(iii) cDNA
(iv) rDNA.

(iii) cDNA

Q32. The strand of DNA that forms mRNA is called?

(i) Lagging strand
(ii) Coding strand
(iii) Antisense strand
(iv) Template strand

(iv) Template strand

Q33. The net electric charge on DNA and histone, is

(i) positive, negative
(ii) negative, positive
(iii) negative, negative
(iv) positive, positive.

(ii) negative, positive

Q34. Which of the following steps in transcription is catalysed by RNA polymerase?

(i) Initiation
(ii) Elongation
(iii) Termination
(iv) All of the above.

(ii) Elongation

Q35. One turn of the helix in p-from DNA is approximately:

(i) 20 Å
(ii) 2 nm
(iii) 20 nm
(iv) 34 nm

(iv) 34 nm

Q36. Amino acid acceptor end of tRNA lies at

(i) 5’ end
(ii) 3’ end
(iii) T VC loop
(iv) DHUloop.

(ii) 3’ end

Q37. At time of organogenesis genes regulate the process at different levels and at different time due to

(i) Promoter
(ii) Exon
(iii) Intron
(iv) Regulator

(ii) Exon

I Think the given NCERT MCQ Questions for class 12 Biology book Chapter 6 Molecular Basis of Inheritance with Answers Pdf free download will assist you. If you’ve got any queries regarding CBSE Class 12 Biology Molecular Basis of Inheritance MCQs Multiple Choice Questions with Answers, drop a comment below and that we will come back to you soon.

Biology MCQs for Class 12 with Answers PDF

Lesson 1. Reproduction in Organisms Class 12 MCQ Questions
Lesson 2. Sexual Reproduction in Flowering Plants Class 12 MCQ Questions
Lesson 3. Human Reproduction Class 12 MCQ Questions
Lesson 4. Reproductive Health Class 12 MCQ Questions
Lesson 5. Principles of Inheritance and Variation Class 12 MCQ Questions
Lesson 6. Molecular Basis of Inheritance Class 12 MCQ Questions
Lesson 7. Evolution Class 12 MCQ Questions
Lesson 8. Human Health and Disease Class 12 MCQ Questions
Lesson 9. Strategies for Enhancement in Food Production Class 12 MCQ Questions
Lesson 10. Microbes in Human Welfare Class 12 MCQ Questions
Lesson 11. Biotechnology: Principles and Processes Class 12 MCQ Questions
Lesson 12. Biotechnology and its Applications Class 12 MCQ Questions
Lesson 13. Organisms and Populations Class 12 MCQ Questions
Lesson 14. Ecosystem Class 12 MCQ Questions
Lesson 15. Biodiversity and Conservation Class 12 MCQ Questions
Lesson 16. Environmental Issues Class 12 MCQ Questions

Leave a Comment