Molecular Basis Of Inheritance — DPP 10

20 NEET questions from Molecular Basis Of Inheritance, with answers and explanations. Attempt it as a timed test to get scoring, accuracy breakdown and mistake tracking.

Attempt this test free 20 questions · 30 minutes · +80 marks
1
Teminious central dogma of protein synthesis is
  1. A DNA → DNA → mRNA → protein
  2. B mRNA → gRNA → DNA → Protein
  3. C gRNA → DNA → mRNA → Protein
  4. D DNA → gRNA → mRNA → Protein
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Correct answer: C

2
Length of DNA with 23 base pairs is
  1. A $78.4 \AA$
  2. B $78.2 \AA$
  3. C $78 \AA$
  4. D $74 \cdot 8 \AA$
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Correct answer: B

3
Intron is part of DNA which
  1. A Codes for protein synthesis
  2. B Helps in joining pieces of DNA
  3. C Does not code for protein synthesis
  4. D Initiates transcription.
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Correct answer: C

4
Okazaki fragments are
  1. A RNA primers
  2. B Short DNA fragments on leading strand
  3. C Short DNA fragements on lagging strand
  4. D DNA fragements from dimerisation
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Correct answer: C

5
Repressor binds to operator of lac operon
  1. A Lactose is unable to remove the repressor
  2. B RNA polymerase is activated
  3. C Galactosidase does not act on lactose
  4. D Structural genes z, y and a fail to transcribe.
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Correct answer: D

6
Unwinding due to release of coiling tension ahead of moving replication fork is due to
  1. A Gyrase
  2. B Unwindase
  3. C Topoisomerase
  4. D All the above
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Correct answer: C

7
Which is true according to Chargaff's rule
  1. A $A+G=T+C$
  2. B $A=C$
  3. C $G=T$
  4. D $\frac{\mathrm{A}+\mathrm{T}}{\mathrm{C}+\mathrm{G}}=1$
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Correct answer: A

8
DNA element with ability to change its position is
  1. A Cistron
  2. B Transposon
  3. C Intron
  4. D Recon.
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Correct answer: B

9
Codon AUG specifies
  1. A Methionine
  2. B Valine
  3. C Tyrosine
  4. D Phenylalanine
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Correct answer: A

10
Continuously functional genes which are regulated on the tissue level are
  1. A House keeping genes
  2. B Luxury genes
  3. C Mild genes
  4. D Gene battery.
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Correct answer: A

11
Sigma factor is component of
  1. A RNA polymerase
  2. B Dissociation factor
  3. C DNA ligase
  4. D DNA polymerase
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Correct answer: A

12
The m-RNA, AUGCAGGAUCGU recognises four amino acid and this character of the code referred to as
  1. A Degeneracy
  2. B Universality
  3. C Non-amibiguity
  4. D Commalessness
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Correct answer: C

13
According to the lac-operon concept, which functional unit of the bacterial genetic material is responsible for suppressing the activity of the operator gene in the absence of lactose?
  1. A Structural gene
  2. B Regulator gene
  3. C Repressor protein
  4. D Promoter gene.
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Correct answer: B

14
Which one codes for an amino acid
  1. A Cistron
  2. B Exon
  3. C Intron
  4. D Codon
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Correct answer: D

15
Mode of DNA replication in Escherichia coli is
  1. A Conservative and unidirectional
  2. B Semiconservative and unidirectional
  3. C Conservative and bidirectional
  4. D Semiconservative and bidirectional.
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Correct answer: D

16
Termination of the translation process occurs at the
  1. A 5' end of the DNA template
  2. B 3' end of the mRNA
  3. C 3' end of t-RNA
  4. D 5' end of mRNA
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Correct answer: B

17
Hn-RNA is
  1. A Heteronuclear RNA
  2. B Homonuclear RNA
  3. C Heterogeneous RNA
  4. D Useful RNA.
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Correct answer: C

18
cDNA is formed by
  1. A DNA dependent DNA polymerase
  2. B RNA dependent DNA polymerase
  3. C DNA dependent RNA polymerase
  4. D DNA ligase
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Correct answer: B

19
Identify the triplet codons which code for amino acids serine and proline.
(a) UCC
(b) CCA
(c) GGG
(d) AAG
The correct answer is
  1. A a and c
  2. B b and d
  3. C c and d
  4. D a and b
Show answer

Correct answer: D

20
Portion of gene which is transcribed but not translated is
  1. A Exon
  2. B Intron
  3. C Cistron
  4. D Codon
Show answer

Correct answer: B

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