Molecular Basis Of Inheritance — DPP 9

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 is incorrect for t-RNA
  1. A t-RNA has an anticodon loop that has bases complementary to the codon of m-RNA
  2. B t-RNA are specific for each amino acid
  3. C Three t-RNA are present for stop codon
  4. D In actual structure, the t-RNA is a compact molecule which looks like inverted L.
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Correct answer: C

2
Choose the incorrect one:
  1. A Nucleosomes in chromatin are seen as "beads on string structure"
  2. B Nucleosome in a histone octamer
  3. C Nucleosome is present in both prokaryotic & eukaryotic DNA
  4. D A typical nucleosome contains 200 bp. of DNA helix
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Correct answer: C

3
Match the column:
Molecular Basis Of Inheritance – NEET-13386
  1. A a → iv, b → ii, c → iii, d → i
  2. B a → iii, b→i, c→iv, d→ii
  3. C a→i, b→ii, c→iii, d→iv
  4. D a→iii, b→iv, c→i, d→ii
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Correct answer: B

4
Read the following sentence
(a) The technique of DNA finger printing was initially developed by Alec Jeffreys.
(b) Hybridisation using labelled VNTR probe is one of the step utilize in DNA finger printing
(c) $99.9%$ of base sequence among human is the same. Pick up wrong statements-
  1. A 'a' only
  2. B 'b' only
  3. C 'c' only
  4. D None
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Correct answer: D

5
Match the column:
Molecular Basis Of Inheritance – NEET-13369
  1. A a → iii, b→i, c→iv, d → ii
  2. B a → iv, b → ii, c → iii, d → i
  3. C a → i, b → ii, c → iii, d → iv
  4. D a → iii, b→iv, c→i, d → ii
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Correct answer: A

6
Chargaff's rules are applicable to
  1. A Single stranded RNA
  2. B Single stranded DNA and RNA
  3. C Single stranded DNA
  4. D Double stranded DNA.
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Correct answer: D

7
Which of the following is exclusive property of transcription found in RNA-polymerase
  1. A Initiation
  2. B Elongation
  3. C Termination
  4. D Processing
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Correct answer: B

8
t-RNA has the function of
  1. A Transcription
  2. B Adapter for attaching amino acids over mRNA template
  3. C Transferring information to mRNA
  4. D Carry genetic code to cytoplasm.
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Correct answer: B

9
In the experiments on the chemistry of DNA Chargaff estimated the base composition of human sperms and found that adenine constituted $31 \%$ and guanine $19 \%$. The quantity of cytosine in DNA of a human somatic cell is likely to be
  1. A $19 \%$
  2. B $38 \%$
  3. C $31 \%$
  4. D $62 \%$
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Correct answer: A

10
Hargobind Khorana was awarded Nobel Prize for
  1. A Deciphering genetic code
  2. B Artificial gene synthesis
  3. C Nucleotide sequence of t RNA
  4. D Discovery of transposons.
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Correct answer: B

11
According to Operon concept a regulator gene forms
  1. A A general inhibitor
  2. B A small peptide
  3. C A repressor
  4. D An inducer
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Correct answer: C

12
DNA replication is
  1. A Semiconservative and semi discontinous
  2. B Semiconservative and discontinous
  3. C Conservative
  4. D Conservative and discontinous
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Correct answer: A

13
The sequence of events mentioned below are symbolised by alphabets. Choose the correct answer where the alphabets are matched with the processes
Molecular Basis Of Inheritance – NEET-13368
  1. A $\mathrm{a}=$ Reverse transcription, $\mathrm{b}=$ Replication, $\mathrm{c}=$ Transcription, $\mathrm{d}=$ Translation
  2. B $\mathrm{a}=$ Replication, $\mathrm{b}=$ Transformation, $\mathrm{c}=$ Transcription, $\mathrm{d}=$ Translation
  3. C $\mathrm{a}=$ Reverse transcription, $\mathrm{b}=$ Transformation $\mathrm{c}=$ Transcription, $\mathrm{d}=$ Translation
  4. D $\mathrm{a}=$ Replication, $\mathrm{b}=$ Transduction $. \mathrm{c}=$ Translation, $\mathrm{d}=$ Transcription.
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Correct answer: A

14
Which of the following is/are the level of regulating of gene expression in eukaryotes
(a) Translational level
(b) Transport of mRNA from nucleus to the cytoplasm
(c) Processing level
(d) Transcriptional level
  1. A a, b only
  2. B d, c, b only
  3. C d, c, a only
  4. D d, c, b, a all
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Correct answer: D

15
The amino acid valine is recognised by the triplets GUU, GUC, GUA and GUG and this character of the code is referred to as
  1. A Degeneracy
  2. B Universality
  3. C Non-ambiguity
  4. D Commalessness
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Correct answer: A

16
Choose the correct option w.r.t. the chemical nature of apo-repressor and co-repressor respectively in trp-operon?
  1. A Protein, Amino acid
  2. B Amino acid, Protein
  3. C Lipoidal, Sugary
  4. D Sugary, Lipoidal
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Correct answer: A

17
Number of Nucleosomes found in helical coil of 30 nm chromatin fibre is
  1. A 6
  2. B 10
  3. C 12
  4. D 15
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Correct answer: A

18
All the termination codons of universal genetic codes begin with a nucleotide, that is
  1. A Adenine
  2. B Cytosine
  3. C Uracil
  4. D Thymine
Show answer & explanation

Correct answer: C

UAA, UAG, UGA are stop codons (Terminator codon). All stop codons of universal genetic codes begin with uracil.
19
The amino acids with a single code are
  1. A Phenylalanine and glycine
  2. B Methionine and Tryptophan
  3. C Glutamic acid and Arginine
  4. D Proline and Glycine
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Correct answer: B

20
Mark the odd one w.r.t. Chargaff's rule.
  1. A $\mathrm { A } + \mathrm { G } = \mathrm { T } + \mathrm { C }$
  2. B $\mathrm { A } + \mathrm { T } / \mathrm { C } + \mathrm { G } = 0.92$ for E.coli
  3. C Purine guanine is equimolar to pyrimidine cytosine
  4. D Applicable for both single as well as double stranded DNA
Show answer & explanation

Correct answer: D

Chargaff's rule is applicable only for ds DNA.

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