Molecular Basis Of Inheritance — DPP 1

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
Which of the following nitrogenous bases are common for both RNA and DNA?
  1. A C, G, A
  2. B G, A, U
  3. C T, A, C
  4. D U, A, C
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Correct answer: A

$\mathrm{Pu} \longrightarrow \mathrm{A}, \mathrm{G} \quad \mathrm{Py} \longrightarrow \mathrm{C}$ are common nitrogenous bases for both RNA and DNA.
2
Which of the following structures are present in core particle of nucleosome?
  1. A Octamer of histone proteins
  2. B 200 bp of DNA
  3. C Non-histone proteins
  4. D Linker DNA
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Correct answer: A

Molecular Basis Of Inheritance – NEET-9933
3
Haploid content of human DNA contains
  1. A $4.6 \times 10^{6} \mathrm{bp}$
  2. B $3.3 \times 10^{8} \mathrm{bp}$
  3. C $6.6 \times 10^{9} \mathrm{bp}$
  4. D $3.3 \times 10^{9} b p$
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Correct answer: D

$3.3 \times 10^{9} \longrightarrow$ Human genome
4
Cytidine is a
  1. A Nucleoside
  2. B Nitrogen base
  3. C Nucleotide
  4. D Common dinucleotide in DNA and RNA
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Correct answer: A

Molecular Basis Of Inheritance – NEET-9931
5
In lac operon, the regulator gene codes for
  1. A Aporepressor
  2. B Corepressor
  3. C Inactive repressor
  4. D Active repressor
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Correct answer: D

6
Unwinding of DNA creates tension which is released by enzyme
  1. A Helicase
  2. B Topoisomerase
  3. C Primase
  4. D Ligase
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Correct answer: B

Topoisomerase remove twisting stress
7
In bacteria, catalytic RNA is found in
  1. A 60 S subunit of ribosome
  2. B 50 S subunit of ribosome
  3. C 30 S subunit of ribosome
  4. D 40 S subunit of ribosome
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Correct answer: B

8
Packaging of DNA helix
  1. A Involves polyamines in eukaryotes
  2. B Occurs with the help of NHC proteins only
  3. C Requires acidic proteins that help in coiling of DNA in prokaryotes
  4. D Is more complex in eukaryotes than prokaryotes
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Correct answer: D

Nucleosome model
9
In eukaryotes, RNA polymerase III catalyses the synthesis of
  1. A 5 S rRNA, tRNA & SnRNA
  2. B mRNA, HnRNA & SnRNA
  3. C 28 S rRNA, 18 S rRNA & 5 S rRNA
  4. D All types of rRNA & tRNA
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Correct answer: A

5S rRNA, tRNA and SnRNA
10
Find out the incorrect match.
  1. A UUU - Phenylalanine
  2. B UAG - Sense condon
  3. C GUG - Valine
  4. D UGG - Tryptophan
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Correct answer: B

UAG → Nonsense codon on stop codon
11
Length of DNA in E. coli is
  1. A 2.2 m
  2. B 1.36 mm
  3. C 1.36 m
  4. D 3.4 m
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Correct answer: B

$4.6 \times 10^{6} \times 0.34 \mathrm{~mm}=1.36 \mathrm{~mm}$
12
When a mature mRNA was hybridised to its gene certain loops were observed. These loops represent
  1. A Introns in DNA
  2. B Introns in rRNA
  3. C Exons in tRNA
  4. D Exons in DNA
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Correct answer: A

Intron → Intervening sequence
13
Sugars are attached to the pyrimidines by the formation of
  1. A Hydrogen bond
  2. B N-glycosidic bond
  3. C Phosphoester bond
  4. D O-glycosidic bond
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Correct answer: B

14
Which of the following processes is related to reverse transcription?
  1. A DNA dependent DNA synthesis
  2. B RNA dependent DNA synthesis
  3. C DNA dependent RNA synthesis
  4. D RNA dependent polypeptide synthesis
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Correct answer: B

Molecular Basis Of Inheritance – NEET-9932
15
Out of the two strands of DNA one is carrying genetic information for transcription and it is called
  1. A Coding strand
  2. B Non template strand
  3. C Sense strand
  4. D Template strand
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Correct answer: D

Antisense or template strand
16
Poly A tail is present in
  1. A mRNA of bacteria
  2. B tRNA of eukaryotes
  3. C Promotor of bacteria
  4. D mRNA of eukaryotes
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Correct answer: D

mRNA of eukaryotes carry poly A tail during post-transcriptional change.
17
One codon codes for only one amino acid, hence the code is
  1. A Ambiguous and non-specific
  2. B Unambiguous and specific
  3. C Ambiguous and specific
  4. D Unambiguous and non-specific
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Correct answer: B

Unambiguous → Like AUG → Methionine
18
In lac operon, the lac mRNA
  1. A Has several initiation and termination codons
  2. B Forms four different enzymes
  3. C Is not transcribed in the presence of lactose
  4. D Is involved in an anabolic reaction
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Correct answer: A

In lac operon model there are 4 different mRNA so it have several initiation and termination codon.
19
During DNA replication which of the following does not act as substrates?
  1. A dATP
  2. B dCTP
  3. C dUTP
  4. D dGTP
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Correct answer: C

dUTP ⟶ Does not exist in DNA
20
Adjacent nucleotides in a polynucleotide chain are joined by
  1. A N-glycosidic bond
  2. B Phosphodiester bond
  3. C O-glycosidic bond
  4. D Hydrogen bond
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Correct answer: B

Molecular Basis Of Inheritance – NEET-9928

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