Molecular Basis of Inheritance Class 12 MCQ Online Test With Answers Questions

Check the below NCERT MCQ Questions for Class 12 Biology Chapter 6 Molecular Basis of Inheritance with Answers Pdf free download. MCQ Questions for Class 12 Biology with Answers were prepared based on the latest exam pattern. We have provided Molecular Basis of Inheritance Class 12 Biology MCQs Questions with Answers to help students understand the concept very well.

Class 12 Biology Chapter 6 MCQ With Answers

Biology Class 12 Chapter 6 MCQs On Molecular Basis of Inheritance

Molecular Basis Of Inheritance MCQ Question 1.
Represser Lac-Operon protein attached to:
(a) Operator
(b) Inducer
(c) Regulator
(d) β-Glacto sidase

Answer

Answer: (b) Inducer

Class 12 Biology Chapter 6 MCQ Question 2.
Following is important in Ïranscription:
(a) DNA Methylase
(b) CAAT Box
(c) Promotar
(d) DNA Polymerase

Answer

Answer: (a) DNA Methylase

Molecular Basis Of Inheritance Class 12 MCQ Question 3.
Anticodon found in:
(a) On DNA
(b) On t-RNA
(c) On r-RNA
(d) On m-RNA

Answer

Answer: (b) On t-RNA

MCQ Of Chapter 6 Biology Class 12 Question 4.
In DNA helix:
(a) Quadrate structure
(b) Polarity
(c) Antiparallel Polarity
(d) Disuiphide bond

Answer

Answer: (c) Antiparallel Polarity

Chapter 6 Biology Class 12 MCQs Question 5.
During splicing axon attached and inducer enzyme for reaction:
(a) RNA Ligase
(b) RNA Catalase
(c) RNA permease
(d) RNA poloymerase

Answer

Answer: (b) RNA Catalase

Ch 6 Bio Class 12 MCQ Question 6.
During DNA synthesis formed segment is:
(a) Polymerase fragment
(b) RNA fragment
(c) Okazaki fragment
(d) RNA Primer

Answer

Answer: (c) Okazaki fragment

MCQ On Molecular Basis Of Inheritance Question 7.
In a give DNA segment ATC ACC AGG ACC CCA ACA, the first base gets mutated. The effect of this on coding by the DNA segment will result in :
(a) One amino acid less in protein
(b) No change in the sequence
(c) Complete change in the type and sequence of amino acid
(d) Change in first amino acid only

Answer

Answer: (b) No change in the sequence

MCQ Questions For Class 12 Biology Chapter 6 Question 8.
DNA fragments are joined in a correct sequence by :
(a) DNA ligase
(b) RNA polymerase
(c) Helicase
(d) DNA polymerase

Answer

Answer: (b) RNA polymerase

MCQ Chapter 6 Biology Class 12 Question 9.
The ratio constant for a species is :
(a) T+C/G + A
(b) A+C/T + G
(c) G + G/A + T
(d) A + C/C + T

Answer

Answer: (b) A+C/T + G

MCQ Of Molecular Basis Of Inheritance Question 10.
DNA repairing is done by:
(a) By DNA polymerase I
(b) By DNA Polymerase II
(c) Both (a) and (b)
(d) By Ligase

Answer

Answer: (b) By DNA Polymerase II

Molecular Basis Of Inheritance MCQ Class 12 Question 11.
A ribotide is made up of:
(a) Ribose + Phosphate + Uracil
(b) Deoxribose + Uracil + Phosphate
(c) Thymine + Ribose + Phosphate
(d) Deoxyribpse + Phosphate + Adenine

Answer

Answer: (a) Ribose + Phosphate + Uracil

Biology Class 12 Chapter 6 MCQ Question 12.
the enzyme involved in transcription is:
(a) DNA Polymerase I
(b) DNA Polymerase II
(c) RNA Polymerase
(d) DNA Polymerase

Answer

Answer: (d) DNA Polymerase

MCQ On Molecular Basis Of Inheritance Class 12 Question 13.
Antiparallel strands of a DNA molecule means that:
(a) One strand turns clockwise
(b) One strand turns anticlockwise
(c) The phosphate groups at the start of two DNA strands are in opposite position
(d) The phosphate groups at the start of two DNA strands, at their ends, share the same position

Answer

Answer: (c) The phosphate groups at the start of two DNA strands are in opposite position

Class 12 Bio Chapter 6 MCQ Question 14.
Which one is mainly transcribed:
(a) Only RNA sequence
(b) Middle repetitive DNA sequence
(c) Highly repetitive DNA sequence
(d) Single copy of DNA sequence

Answer

Answer: (c) Highly repetitive DNA sequence

MCQs Of Biology Class 12 Chapter 6 Question 15.
Amino acid sequence, in protein synthesis is decided by the sequence of?
(a) c-DNA
(b) r-RNA
(c) f-RNA
(d) m-RNA

Answer

Answer: (b) r-RNA

Question 16.
DNA multiplication is also called:
(a) Replication
(b) Transduction
(c) Translation
(d) Transcription

Answer

Answer: (b) Transduction

Question 17.
During Protein synthesis, atone point the process comes to a halt. Select the group of the three codons from the following, from which any one of the three could bring about this halt:
(a) UUC, UUA, UAC
(b) UAG, UGA, UAA
(c) UUE, UCA, UCG
(d) UUU, UCC, UAU

Answer

Answer: (b) UAG, UGA, UAA

Question 18.
One turn of the helix in p-from DNA is approximately:
(a) 20 Å
(b) 2 nm
(c) 20 nm
(d) 34 nm

Answer

Answer: (d) 34 nm

Question 19.
Which is not component of lac operon:
(a) Primer gene
(b) Promoter gene
(c) constructive gene
(d) Regulator gene

Answer

Answer: (c) constructive gene

Question 20.
Okazaki fregments is:
(a) RNA primer
(b) small segments of DNA on leading stand
(c) Small segments of DNA on lagging stand
(d) None of these

Answer

Answer: (c) Small segments of DNA on lagging stand

Question 21.
Transposons occur in:
(a) In Eukaryotes
(b) In Prokaryotes
(c) In both (a) and (b)
(d) None of these

Answer

Answer: (c) In both (a) and (b)

Question 22.
One of these is not prepared directly from DNA
(a) m-RNA
(b) f-RNA
(c) r-RNA
(d) Protein

Answer

Answer: (d) Protein

Question 23.
Coiling of DNA duplex is:
(a) Left-handed
(b) Right-handed
(c) Parallel
(d) All of these

Answer

Answer: (c) Parallel

Question 24.
DNA double helix model was given by:
(a) Knoll and Ruska
(b) Khorana
(c) Watson and Crick
(d) Priestley

Answer

Answer: (c) Watson and Crick

Question 25.
Inprokaryotic translation, GTP molecule required in at:
(a) Formation of formyl-met-f-RNA
(b) Joining of 30S sub-unit of ribosome with n-RNA
(c) Joining of 30S m-RNA on Formyl-met-f-RNA
(d) Joining of 50S subunit of ribosome with initiation complex

Answer

Answer: (b) Joining of 30S sub-unit of ribosome with n-RNA

Question 26.
DNA transcription, if nucleotide sequence of DNA strand, that is being coded in ATACG, then the nucleotide sequence in m-RNA would be:
(a) UATGC
(b) TATGC
(c) TCTGG
(d) UAUGC

Answer

Answer: (b) TATGC

Question 27.
In a m-RNA, how many nucleotide sequence code for amino acid:
(a) One
(b) Two
(c) Three
(d) Four

Answer

Answer: (a) One

Question 28.
RNA from which has clover leaf model:
(a) f-RNA
(b) r-RNA
(c) hn-RNA
(d) m-RNA

Answer

Answer: (a) f-RNA

Question 29.
Nitrogenous bases present in DNA:
(a) Adenine, guanine, cytosine, thymine
(b) Adenine, guanine, cytosine, uracil
(c) Adenine, thymine, uracil
(d) Guanine, uracil

Answer

Answer: (a) Adenine, guanine, cytosine, thymine

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