Class 12 Biology Chapter 6 MCQ. We covered all the Class 12 Biology Chapter 6 MCQ in this post for free so that you can practice well for the exam.
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MCQ on Class 12 Biology for Students
Which of the following is TRUE with respect to transcription and translation in bacteria?
(A) mRNA requires to undergo processing and maturation before becoming active.
(B) Transcription and translation take place in separate cell compartments.
(C) Translation can begin before the mRNA is fully transcribed.
(D) Transcription and translation cannot be coupled.
Option c – Translation can begin before the mRNA is fully transcribed.
Which is the predominant site for the control of gene expression in prokaryotes?
(A) Transport of mRNA from the nucleus to the cytoplasm
(B) Formation of the primary transcript
(C) Regulation of splicing
(D) Control of the rate of transcriptional initiation
Option d – Control of the rate of transcriptional initiation
…….. proposed the scheme for DNA replication.
(A) Mussels on and Stahl
(B) Watson and Crick
(C) Hershey and Chase
(D) Frederick Griffith
Option b – Watson and Crick
Negatively charged DNA is wrapped around a positively charged histone complex, forming
(A) deoxyribonucleic acid
(B) histone octamer
(C) nucleosome
(D) nucleoid
Option c – nucleosome
Read the following statements and choose the correct option. Statement I: E. coli infected with 32P labeled bacteriophages, were radioactive, indicating DNA is passed from virus to bacteria. Statement II: RNA is the genetic material of the Tobacco Mosaic Virus and QB bacteriophage.
(A) Statement I is correct and statement II is incorrect.
(B) Statement II is correct and statement I is incorrect.
(C) Both statement I and statement II are correct.
(D) Both statement I and statement II are incorrect.
Option c – Both statement I and statement II are correct.
Which of the following is NOT an essential criterion of a molecule that acts as genetic material?
(A) It should be chemically and structurally stable.
(B) It should be able to undergo replication.
(C) It should be capable of undergoing changes required for evolution.
(D) It should be composed of complementary and antiparallel strands.
Option d – It should be composed of complementary and antiparallel strands
Which of the following is NOT a region in the transcription unit of DNA?
(A) Terminator
(B) Sigma factor
(C) Promoter
(D) Structural gene
Option b – Sigma factor
During DNA replication, the discontinuously synthesized fragments are joined by
(A) Helicase
(B) Ligase
(C) Transacetylase
(D) RNA polymerase
Option b – Ligase
The unequivocal proof that DNA is genetic material came from the experiments of
(A) Friedrich Meischer
(B) Alfred Hershey and Martha Chase
(C) Frederick Griffith
(D) Oswald Avery. Colin Macleod and Maclyn McCarty
Option b – Alfred Hershey and Martha Chase
……. DNA is a small stretch of DNA repeated many times, which forms small peaks after undergoing density gradient centrifugation.
(A) Repetitive
(B) Satellite
(C) Bulk
(D) Both (B) and (C)
Option b – Satellite
Which of the following is NOT a stop codon?
(A) UAA
(B) UUA
(C) UAG
(D) UGA
Option b – UUA
Allelic sequence variation in a population with a frequency greater than 0.01 is known as
(A) DNA polymorphism
(B) VNTR
(C) repetitive DNA
(D) satellite DNA
Option a – DNA polymorphism
…….. acts as an inducer for lac operon.
(A) Glucose
(B) Lactose
(C) Galactose
(D) Fructose
Option b – Lactose
Read the following statements and choose the correct option. Statement I: Template strand of the DNA in the structural gene of a transcription unit has 5′-3′ polarity. Statement II: The template strand is used as a reference to define the transcription unit.
(A) Statement I is correct and statement II is incorrect.
(B) Statement II is correct and statement I is incorrect.
(C) Both statement I and statement II are correct.
(D) Both statement I and statement II are incorrect.
Option d – Both statement I and statement II are incorrect.
Which of the following is NOT required for the initiation of translation?
(A) Start codon
(B) p factor
(C) Initiator tRNA
(D) Both (B) and (C)
Option b – p factor
Which of the following is CORRECT with respect to the Variable Number of Tandem Repeats (VNTR)?
(A) They belong to the category of mini satellites.
(B) The copy number of the sequences varies from chromosome to chromosome in an individual.
(C) The size of VNTR varies from 0.1 to 20 kb.
(D) All of the above
Option d – All of the above
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