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

Molecular Basis of Inheritance Class 12 Biology MCQs Questions with Answers

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 Quiz

Class 12 Biology Chapter 6 MCQ Online Test

You can refer to NCERT Solutions for Class 12 Biology Chapter 6 Molecular Basis of Inheritance to revise the concepts in the syllabus effectively and improve your chances of securing high marks in your board exams.

Molecular Basis of Inheritance Class 12 Biology MCQ online test

Q1.	In a DNA strand the nucleotides are linked together by
	A.glycosidic bonds
	B.phosphodiester bonds
	C.peptide bonds
	D.hydorgen bonds.

Ans: phosphodiester bonds

Q2.	The net electric charge on DNA and histones is
	A.both positive
	B.both negative
	C.negative and positive, respectively
	D.zero.

Ans: negative and positive, respectively

Q3.	Which of the following statements is the most appropriate for sickle cell anaemia ?
	A.It cannot be treated with iron supplements.
	B.It is a molecular disease.
	C.It conferes resistance to acquiring malaria.
	D.All of the above.

Ans: All of the above.

Q4.	The first genetic material could be
	A.protein
	B.cabohydrates
	C.DNA
	D.RNA.

Ans: RNA.

Q5.	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.

Ans: chromosome 1 and Y

Q6.	Who amongst the following scientist had no contribution in the development of the double helix model for the structure of DN A ?
	A.Rosalind Franklin
	B.Maurice Wilkins
	C.Erwin Chargaff
	D.Meselson and Stahl

Ans: Maurice Wilkins

Q7.	Which of the following steps in transcription is catalysed by RNA polymerase ?
	A.Initiation
	B.Elongation
	C.Termination
	D.All of the above

Ans: All of the above

Q8.	Control of gene expression takes place at the level of
	A.DNA-replication
	B.transcription
	C.translation
	D.none of the above.

Ans: transcription

Q9.	Which was the last human chromosome to be completely sequenced ?
	A.Chromosome 1
	B.Chromosome 11
	C.Chromosome 21
	D.Chromosome X

Ans: Chromosome 1

Q10.	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.

Ans: cDNA

Q11.	If the sequence of initrogen bases of the coding strand of DNA in a transcription unit is: 5’ – ATGAATG – 3’, the sequence of bases in its RNA transcript would be
	A.5’ – AUG A AUG – 3’
	B.5’ – UACUU AC – 3’
	C.5’ – CAUUCAU – 3’
	D.5’ – GUAAGUA – 3’.

Ans: 5’ – GUAAGUA – 3’.

Q12.	The RNA polymerase holocnzyme transcribes
	A.the promoter, structural gene and the terminator region.
	B.the promoter and the terminator region
	C.the structural gene and the terminator region
	D.the structural gene only.

Ans: the promoter and the terminator region

Q13.	If the base sequence of a codon in mRNA is 5’ – AUG – 3′ the sequence of tRNA pairing with it must be
	A.5’ – UAC – 3’
	B.5’ – CAU – 3’
	C.5’-AUG – 3’
	D.5’ – GUA – 3’

Ans: 5’ – CAU – 3’

Q14.	The amino acid attaches to the tRNA at its
	A.5’- end
	B.3’ – end
	C.anticodon site
	D.DHUloop.

Ans: 3’ – end

Q15.	To initiate translation, the wiRNA first bind to
	A.the smaller ribosomal sub-unit
	B.the larger ribosomal sub-unit
	C.the whole ribosome
	D.no such specificity exists.

Ans: the smaller ribosomal sub-unit

Q16.	In E. colt, 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.

Ans: lactose is present and it binds to the repressor

Q17.	In DNA strand, the nucleotides are linked together by
	A.glycosidic bonds
	B.phosphodiester bonds
	C.peptide bonds
	D.hydrogen bonds.

Ans: phosphodiester bonds

Q18.	If a double stranded DNA has 20% of cytosine, what will be the percentage of adenine in it ?
	A.20%
	B.40%
	C.30%
	D.60%

Ans: 30%

Q19.	If the sequence of bases in one strand of DNA is ATGCATGCA, what would be the sequence of bases on complementary strand ?
	A.ATGCATGCA
	B.AUGCAUGCA
	C.TACTACGT
	D.UACGUACGU

Ans: TACTACGT

Q20.	How far is each base pair from the next one in DNA double helix model ?
	A.2 nm
	B.3.4 nm
	C.34 nm
	D.0.34 nm

Ans: 0.34 nm

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