Class 12 Biology MCQs Molecular Basis Of Inheritance for NEET

Here, you will get Class 12 Biology MCQ of Chapter 6 Molecular Basis Of Inheritance for cracking NEET/AIIMS. By solving these MCQs of Class 12 Biology Chapter 6 Molecular Basis Of Inheritance, you will get the confidence to crack NEET. Practice MCQ Questions for Class 12 Biology with Answers on a daily basis and score well in exams. 

Molecular Basis Of Inheritance Class 12 MCQs Questions with Answers

The net electric charge on DNA and histones is
(a) both positive
(b) both negative
(c) negative and positive, respectively
(d) zero

Answer: (c) negative and positive, respectively

The first genetic material could be
(a) protein
(b) cabohydrates
(c) DNA
(d) RNA

Answer: (d) RNA

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

Answer: (c) chromosome 1 and Y

Which of the following steps in transcription is catalysed by RNA polymerase ?
(a) Initiation
(b) Elongation
(c) Termination
(d) All of the above

Answer: (d) All of the above

Which was the last human chromosome to be completely sequenced ?
(a) Chromosome 1
(b) Chromosome 11
(c) Chromosome 21
(d) Chromosome X

Answer: (a) Chromosome 1

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’

Answer: (d) 5’ – GUAAGUA – 3’

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

Answer: (a) the smaller ribosomal sub-unit

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: (b) A+C/T + G

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

DNA multiplication is also called
(a) Replication
(b) Transduction
(c) Translation
(d) Transcription

Answer: (b) Transduction

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

Answer: (b) UAG, UGA, UAA

Enzyme responsible for DNA replication
(a) Polymerase
(b) Proteolytic
(c) Ligase
(d) Carboxylase

Answer: (a) Polymerase

Transcription is the formation of
(a) mRNA
(b) tRNA
(c) rRNA
(d) Protein

Answer: (a) mRNA

The element required for the activation of DNA and DNA polymerase is
(a) Ca2+
(b) Mg2+
(c) K+
(d) Cu2+

Answer: (b) Mg2+

Sickle cell anaemia is caused by change in
(a) A single base
(b) a chain of haemoglobin
(c) Frame shift mutation
(d) Whole ß chain of haemoglobin

Answer: (a) A single base

The mitochondrial DNA differs from nuclear DNA in
(а) Being linear
(b) Having A = T and C = G
(c) Being highly twisted
(d) Lacking binding of histones

Answer: (d) Lacking binding of histones

Represser Lac-Operon protein attached to
(a) Operator
(b) Inducer
(c) Regulator
(d) β-Glacto sidase

Answer: (b) Inducer

Anticodon found in
(a) On DNA
(b) On t-RNA
(c) On r-RNA
(d) On m-RNA

Answer: (b) On t-RNA

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

Answer: (d) 0.34 nm

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%

Answer: (c) 30%

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

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

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

Answer: (d) 34 nm

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: (b) r-RNA

A ribotide is made up of
(a) Ribose + Phosphate + Uracil
(b) Deoxribose + Uracil + Phosphate
(c) Thymine + Ribose + Phosphate
(d) Deoxyribpse + Phosphate + Adenine

Answer: (a) Ribose + Phosphate + Uracil

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: (b) No change in the sequence

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