Molecular Basis Of Inheritance — DPP 12

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
Best method to determine parternity is
  1. A Protein analysis
  2. B Chromosome counting
  3. C Gene counting
  4. D DNA finger printing
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Correct answer: D

2
In dihybrid cross of pea plant, the ratio of pure heterozygous for both yellow round and green wrinkled seeded plants in $\mathrm{F}_{2}$ generation will be
  1. A $\frac{1}{16}$
  2. B $\frac{1}{4}$
  3. C $\frac{1}{8}$
  4. D $\frac{3}{16}$
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Correct answer: B

3
In the mitochondrial DNA, UGA codes for
  1. A Chain termination
  2. B Chain initiation
  3. C Tryptophan
  4. D Tyrosine
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Correct answer: C

4
Transfer RNA (tRNA)
  1. A is present in the ribosomes and provides structural integrity
  2. B usually has clover leaf-like structure
  3. C carries genetic information from DNA to ribosomes
  4. D codes for proteins
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Correct answer: B

5
According to the original model of DNA as proposed by Watson & Crick 1953, DNA is a
  1. A left handed helix
  2. B helix that makes a full turn every 70 nm .
  3. C helix where one turn of DNA contains 20 basepairs
  4. D two stranded helix where each strand has opposite polarity.
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Correct answer: D

6
If DNA codons are ATG GAA, insertion of thymine after the first codon results in,
  1. A non-sense mutation
  2. B mis-sense mutation
  3. C frameshift mutation
  4. D silent mutation
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Correct answer: C

7
The function of promoter in lac-operon is to
  1. A Bind to gyrase
  2. B Bind to RNA polymerase
  3. C Code for DNA polymerase
  4. D Process mRNA.
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Correct answer: B

8
Match the columns
Molecular Basis Of Inheritance – NEET-13365
  1. A $\mathrm{a}-2, \mathrm{~b}-3, \mathrm{c}-1, \mathrm{~d}-4$
  2. B $a-1, b-4, c-2, d-3$
  3. C $\mathrm{a}-3, \mathrm{~b}-1, \mathrm{c}-4, \mathrm{~d}-2$
  4. D $\mathrm{a}-2, \mathrm{~b}-4, \mathrm{c}-1, \mathrm{~d}-3$
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Correct answer: C

9
Watson and Crick model of DNA is
  1. A B-form DNA with a spiral length of $34 \AA$ and a diameter of $20 \AA$
  2. B A-form DNA with a spiral length of $15 \AA$ and a diameter of $20 \AA$
  3. C Z-form DNA with a spiral length of $34 \AA$ and a diameter of $20 \AA$
  4. D B-form DNA with a spiral length of $28 \AA$ and a diameter of $14 \AA$
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Correct answer: A

10
In a DNA segment having six coils, there are 22 nitrogen base pairs linked by two hydrogen bonds. How many cytosine bases are found in that segment?
  1. A 22
  2. B 38
  3. C 44
  4. D 76
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Correct answer: B

11
Smallest part of DNA that can undergo recombination is
  1. A Muton
  2. B Cistron
  3. C Replicon
  4. D Recon
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Correct answer: D

12
Which of the following has monosomic condition
  1. A Klinefelter syndrome
  2. B Down's syndrome
  3. C Turner syndrome
  4. D Cry-du-chat syndrome
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Correct answer: C

13
Synthesis of RNA molecule is terminated by
  1. A Alpha factor
  2. B Gamma factor
  3. C Delta factor
  4. D rho factor
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Correct answer: D

14
Heat killed pathogenic bacterial cells and live nonpathogenic cells are mixed and injected into mice. The result would be
  1. A Mice develop disease and die
  2. B Mice die without developing disease
  3. C Mice remain healthy
  4. D 50% mice develop disease and die
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Correct answer: A

15
Consider the following statements and state true (T) or false (F).
A : In the prokaryotes, control of the rate of transcriptional initiation is the predominant site for control of gene expression.
B: Lac i is a constitutive gene of lac operon
C : Tryptophan operon has five structural genes.
  1. A
  2. B
  3. C
  4. D
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Correct answer: D

16
Operon contains
  1. A Operator and regulator genes
  2. B Operator and structural gene
  3. C Operator and regulator genes repressor
  4. D Operator gene, regulator gene repressor, structural genes and promoter gene
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Correct answer: D

17
Transcription
  1. A Starts at initiations region and ends at stop region
  2. B Starts at operator region and ends at telomeric end
  3. C Starts at promoter region and ends are terminator region
  4. D Starts at CCA box and ends at TATA box.
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Correct answer: C

18
The bond formed between phosphate and pentose sugars of DNA is
  1. A Sulphide bond
  2. B Phosphodiester bond
  3. C Hydrogen bond
  4. D Covalent bond
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Correct answer: B

19
In a DNA, percentage of thymine is 20% what is the percentage of guanine
  1. A 20%
  2. B 40%
  3. C 30%
  4. D 60%
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Correct answer: C

20
Transcriptionally active chromatin is called as $\_\_\_\_$ (a) $\_\_\_\_$ and transcriptionally inactive chromatin is called as $\_\_\_\_$ (b) $\_\_\_\_$ . One strand of DNA, replication is continuous & it is called as $\_\_\_\_$ (c) $\_\_\_\_$ while on another strand of DNA replication is discontinuous & it is called as $\_\_\_\_$ (d) $\_\_\_\_$ . Here (a), (b), (c) & (d) respectively:
  1. A (a) Heterochromatin, (b) Euchromatin, (c) Lagging strand, (d) Leading strand
  2. B (a) Euchromatin, (b) Heterochromatin, (c) Leading strand, (d) Lagging strand
  3. C (a) Heterochromatin, (b) Euchromatin, (c) Leading strand, (d) Continuous strand
  4. D (a) Euchromatin, (b) Heterochromatin, (c) Discontinuous strand, (d) Leading strand
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Correct answer: B

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