Molecular Basis Of Inheritance — DPP 11

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 mutation forms the genetic basis of proof that codon is a triplet and it is read in a contiguous manner
  1. A Chromosomal structural mutations
  2. B Chromosomal numerical mutations
  3. C Substitutional mutation
  4. D Frame shift insertion or deletion mutation
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Correct answer: D

2
In DNA replication, the leading strand is the one which replicates in
  1. A $5^{\prime} \longrightarrow 3$ ' direction continuously
  2. B 3' $\longrightarrow 5^{\prime}$ direction continuously
  3. C 5' ⟶ 3' direction discontinuously
  4. D $3^{\prime} \longrightarrow 5^{\prime}$ direction discontinuously.
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Correct answer: A

3
The strand of DNA which is synthesized continuously during replication is called
  1. A leading strand
  2. B lagging strand
  3. C sense strand
  4. D antisense strand
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Correct answer: A

4
Find the correct match
  1. A UUA - Valine
  2. B AUG - Cysteine
  3. C AAA - Lysine
  4. D CCC- Alanine
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Correct answer: C

5
There are 64 codons in genetic code dictionary because
  1. A There are 64 types of tRNA found in the cell
  2. B There are 44 meaningless and 20 codons for amino acids
  3. C There are 64 amino acids to be coded
  4. D Genetic code is triplet
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Correct answer: D

6
What is correct
  1. A mRNA is polycistronic in eukaryotes and moncistronic in prokaryotes
  2. B mRNA is polycistronic in both eukaryotes and prokaryotes
  3. C mRNA is monocistronic in both eukaryotes and prokaryotes
  4. D mRNA is polycistronic in prokaryotes and monocistronic in eukaryotes
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Correct answer: D

7
Radioactive $\left( { } ^ { 35 } \mathrm {~S} \right)$ was detected in?
  1. A Supernatant
  2. B Sediment
  3. C Both 1 and 2
  4. D None of these
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Correct answer: A

8
According to Mendel, ............... segregate and ......... assort independently.
  1. A alleles of a gene; alleles of different genes
  2. B alleles of different genes; alleles of a gene
  3. C dominanat traits; recessive traits
  4. D recessive traits; recessive traits
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Correct answer: A

9
At the end of the process of DNA replication the newly formed lagging strand is also continuous due to the
  1. A Okazaki fragements
  2. B Semiconservative method of replication
  3. C DNA ligases
  4. D Double-stranded nature of DNA
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Correct answer: C

10
The sequences of four DNA molecules are given below:
i. TATATATATATATA
ATATATATATATAT
ii. TTTCCCGGGAAA
AAAGGGCCCTTT
iii. TTGCGTTGCCC
AACGCAACGGG
iv. GCCGGATCCGGC
CGGCCTAGGCCG
Which one of these DNA moelcules will have the highest melting temperature ( $\mathrm { T } _ { \mathrm { m } }$ )?
  1. A i
  2. B ii
  3. C iii
  4. D iv
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Correct answer: D

11
DNA replication requires
  1. A DNA polymerase
  2. B DNA ligase
  3. C RNA polymerase
  4. D All the above
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Correct answer: D

12
The RNA primer is used in
  1. A Translation
  2. B Replication
  3. C Conjugation
  4. D Transformation
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Correct answer: B

13
Complete turns in 45000 bp DNA would
  1. A 45
  2. B 450
  3. C 4500
  4. D 45, 000.
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Correct answer: C

14
The basis of DNA finger-printing is
  1. A The double helix
  2. B Error in base sequence
  3. C Polymorphism in sequence
  4. D DNA replication
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Correct answer: C

15
During elongation occuring in translation, the enzyme which catalyses the synthesis of peptide bond is
  1. A Peptidyl transferase
  2. B Peptidyl synthetase
  3. C Protease
  4. D Amino acyl synthetase
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Correct answer: A

16
In ATG ACC AGG ACC CCA ACA sequence, the first base gets mutated. It will affect
  1. A Change in types and sequence of amino acids
  2. B Change in first amino acid only
  3. C No change
  4. D One amino acid less
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Correct answer: B

17
Length of mRNA that carries information for complete polypeptide synthesis is
  1. A Muton
  2. B Codon
  3. C Operon
  4. D Cistron.
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Correct answer: D

18
Select the correct statement(s) about lac operon.
a. Glucose or galactose act as inducer for the expression of lac operon
b. In the presence of lactose the repressor protein binds with the lactose molecules
c. It is an example of repressible operon system
d. Its regulation by repressor protein is called positive regulation.
  1. A a and b
  2. B b and c
  3. C Only b
  4. D Only d
Show answer & explanation

Correct answer: C

Lactose acts as an inducer. Regulation of lac operon by repressor protein is negative regulation. When lactose is absent repressor binds to the operator and in the presence of lactose repressor binds to lactose. Lac operon is inducible operon system.
19
In Rous sarcoma virus, the flow of information is
  1. A DNA → RNA → Proteins
  2. B DNA → Proteins → RNA
  3. C RNA → DNA → RNA → proteins
  4. D RNA → DNA → proteins
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Correct answer: C

20
Majority of unusual bases are found in $\mathrm { tRNA } , \mathrm { T } \Psi \mathrm { C }$ loop is
  1. A First loop from $5 ^ { \prime }$-end of tRNA
  2. B AA - tRNA synthetase binding loop
  3. C Ribosomal binding loop
  4. D Nodoc site
Show answer & explanation

Correct answer: C

$\mathrm { T } \psi \mathrm { C } \rightarrow$ Ribosomal binding loop

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