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Home/NEET/biology/molecular basis of inheritance
Curated PYQ Collection

Top 50 Most Repeated MOLECULAR BASIS OF INHERITANCE PYQs | NEET

A curated collection of the most important questions from MOLECULAR BASIS OF INHERITANCE, fully solved with step-by-step concepts to prepare for NEET.

Question #1

Practice Question

A.Coding strand
B.Anticoding strand
C.Sense strand
D.Template strand

Concept Applied

Template strand is complementary; mRNA is synthesized 5'→3' using it....

Read Full Step-by-Step Solution →

Question #2

Practice Question

A.Template strand
B.Coding strand
C.Sense strand
D.Leading strand

Concept Applied

RNA polymerase uses the template (antisense) strand to synthesize mRNA....

Read Full Step-by-Step Solution →

Question #3

Practice Question

A.The code is degenerate and non‑overlapping.
B.The code is overlapping, so a single nucleotide can belong to more than one codon.
C.The code is ambiguous; a codon can code for more than one amino acid.
D.The code is non‑degenerate; each codon specifies a unique amino acid.

Concept Applied

The genetic code is degenerate because several codons can code for the same amino acid, and it is non‑overlapping because each nucleotide is part of o...

Read Full Step-by-Step Solution →

Question #4

Practice Question

A.One codon codes for multiple amino acids
B.Multiple codons code for one amino acid
C.Codons do not overlap
D.Each codon is unique

Concept Applied

Degeneracy: more than one codon specifies the same amino acid (e.g., UCU, UCC → Serine)....

Read Full Step-by-Step Solution →

Question #5

Practice Question

A.Degeneracy
B.Ambiguity
C.Universality
D.Non-overlapping

Concept Applied

Degeneracy means multiple codons code for the same amino acid....

Read Full Step-by-Step Solution →

Question #6

Practice Question

A.Bound to operator
B.Not synthesized
C.Bound to inducer
D.Free in cytoplasm

Concept Applied

Without lactose, repressor remains active and binds operator, blocking transcription....

Read Full Step-by-Step Solution →

Question #7

Practice Question

A.It acts as a corepressor, enabling the repressor to bind the operator.
B.It acts as an inducer by binding to the repressor, preventing it from binding to the operator.
C.It directly binds to the promoter region to enhance transcription.
D.It degrades the mRNA of the operon, reducing protein synthesis.

Concept Applied

Allolactose binds to the lac repressor, causing a conformational change that reduces the repressor's affinity for the operator. This lifts repression ...

Read Full Step-by-Step Solution →

Question #8

Practice Question

A.Coding strand
B.Anticoding strand
C.Sense strand
D.Template strand

Concept Applied

Template strand is complementary; mRNA is synthesized 5'→3' using it....

Read Full Step-by-Step Solution →

Question #9

Practice Question

A.Template strand
B.Coding strand
C.Sense strand
D.Leading strand

Concept Applied

RNA polymerase uses the template (antisense) strand to synthesize mRNA....

Read Full Step-by-Step Solution →

Question #10

Practice Question

A.The code is degenerate and non‑overlapping.
B.The code is overlapping, so a single nucleotide can belong to more than one codon.
C.The code is ambiguous; a codon can code for more than one amino acid.
D.The code is non‑degenerate; each codon specifies a unique amino acid.

Concept Applied

The genetic code is degenerate because several codons can code for the same amino acid, and it is non‑overlapping because each nucleotide is part of o...

Read Full Step-by-Step Solution →

Question #11

Practice Question

A.One codon codes for multiple amino acids
B.Multiple codons code for one amino acid
C.Codons do not overlap
D.Each codon is unique

Concept Applied

Degeneracy: more than one codon specifies the same amino acid (e.g., UCU, UCC → Serine)....

Read Full Step-by-Step Solution →

Question #12

Practice Question

A.Degeneracy
B.Ambiguity
C.Universality
D.Non-overlapping

Concept Applied

Degeneracy means multiple codons code for the same amino acid....

Read Full Step-by-Step Solution →

Question #13

Practice Question

A.Bound to operator
B.Not synthesized
C.Bound to inducer
D.Free in cytoplasm

Concept Applied

Without lactose, repressor remains active and binds operator, blocking transcription....

Read Full Step-by-Step Solution →

Question #14

Practice Question

A.It acts as a corepressor, enabling the repressor to bind the operator.
B.It acts as an inducer by binding to the repressor, preventing it from binding to the operator.
C.It directly binds to the promoter region to enhance transcription.
D.It degrades the mRNA of the operon, reducing protein synthesis.

Concept Applied

Allolactose binds to the lac repressor, causing a conformational change that reduces the repressor's affinity for the operator. This lifts repression ...

Read Full Step-by-Step Solution →

Question #15

Practice Question

A.Coding strand
B.Anticoding strand
C.Sense strand
D.Template strand

Concept Applied

Template strand is complementary; mRNA is synthesized 5'→3' using it....

Read Full Step-by-Step Solution →

Question #16

Practice Question

A.Template strand
B.Coding strand
C.Sense strand
D.Leading strand

Concept Applied

RNA polymerase uses the template (antisense) strand to synthesize mRNA....

Read Full Step-by-Step Solution →

Question #17

Practice Question

A.The code is degenerate and non‑overlapping.
B.The code is overlapping, so a single nucleotide can belong to more than one codon.
C.The code is ambiguous; a codon can code for more than one amino acid.
D.The code is non‑degenerate; each codon specifies a unique amino acid.

Concept Applied

The genetic code is degenerate because several codons can code for the same amino acid, and it is non‑overlapping because each nucleotide is part of o...

Read Full Step-by-Step Solution →

Question #18

Practice Question

A.One codon codes for multiple amino acids
B.Multiple codons code for one amino acid
C.Codons do not overlap
D.Each codon is unique

Concept Applied

Degeneracy: more than one codon specifies the same amino acid (e.g., UCU, UCC → Serine)....

Read Full Step-by-Step Solution →

Question #19

Practice Question

A.Degeneracy
B.Ambiguity
C.Universality
D.Non-overlapping

Concept Applied

Degeneracy means multiple codons code for the same amino acid....

Read Full Step-by-Step Solution →

Question #20

Practice Question

A.Bound to operator
B.Not synthesized
C.Bound to inducer
D.Free in cytoplasm

Concept Applied

Without lactose, repressor remains active and binds operator, blocking transcription....

Read Full Step-by-Step Solution →

Question #21

Practice Question

A.It acts as a corepressor, enabling the repressor to bind the operator.
B.It acts as an inducer by binding to the repressor, preventing it from binding to the operator.
C.It directly binds to the promoter region to enhance transcription.
D.It degrades the mRNA of the operon, reducing protein synthesis.

Concept Applied

Allolactose binds to the lac repressor, causing a conformational change that reduces the repressor's affinity for the operator. This lifts repression ...

Read Full Step-by-Step Solution →

Question #22

Practice Question

A.Coding strand
B.Anticoding strand
C.Sense strand
D.Template strand

Concept Applied

Template strand is complementary; mRNA is synthesized 5'→3' using it....

Read Full Step-by-Step Solution →

Question #23

Practice Question

A.Template strand
B.Coding strand
C.Sense strand
D.Leading strand

Concept Applied

RNA polymerase uses the template (antisense) strand to synthesize mRNA....

Read Full Step-by-Step Solution →

Question #24

Practice Question

A.The code is degenerate and non‑overlapping.
B.The code is overlapping, so a single nucleotide can belong to more than one codon.
C.The code is ambiguous; a codon can code for more than one amino acid.
D.The code is non‑degenerate; each codon specifies a unique amino acid.

Concept Applied

The genetic code is degenerate because several codons can code for the same amino acid, and it is non‑overlapping because each nucleotide is part of o...

Read Full Step-by-Step Solution →

Question #25

Practice Question

A.One codon codes for multiple amino acids
B.Multiple codons code for one amino acid
C.Codons do not overlap
D.Each codon is unique

Concept Applied

Degeneracy: more than one codon specifies the same amino acid (e.g., UCU, UCC → Serine)....

Read Full Step-by-Step Solution →

Question #26

Practice Question

A.Degeneracy
B.Ambiguity
C.Universality
D.Non-overlapping

Concept Applied

Degeneracy means multiple codons code for the same amino acid....

Read Full Step-by-Step Solution →

Question #27

Practice Question

A.Bound to operator
B.Not synthesized
C.Bound to inducer
D.Free in cytoplasm

Concept Applied

Without lactose, repressor remains active and binds operator, blocking transcription....

Read Full Step-by-Step Solution →

Question #28

Practice Question

A.It acts as a corepressor, enabling the repressor to bind the operator.
B.It acts as an inducer by binding to the repressor, preventing it from binding to the operator.
C.It directly binds to the promoter region to enhance transcription.
D.It degrades the mRNA of the operon, reducing protein synthesis.

Concept Applied

Allolactose binds to the lac repressor, causing a conformational change that reduces the repressor's affinity for the operator. This lifts repression ...

Read Full Step-by-Step Solution →

Question #29

Practice Question

A.Coding strand
B.Anticoding strand
C.Sense strand
D.Template strand

Concept Applied

Template strand is complementary; mRNA is synthesized 5'→3' using it....

Read Full Step-by-Step Solution →

Question #30

Practice Question

A.Template strand
B.Coding strand
C.Sense strand
D.Leading strand

Concept Applied

RNA polymerase uses the template (antisense) strand to synthesize mRNA....

Read Full Step-by-Step Solution →

Question #31

Practice Question

A.The code is degenerate and non‑overlapping.
B.The code is overlapping, so a single nucleotide can belong to more than one codon.
C.The code is ambiguous; a codon can code for more than one amino acid.
D.The code is non‑degenerate; each codon specifies a unique amino acid.

Concept Applied

The genetic code is degenerate because several codons can code for the same amino acid, and it is non‑overlapping because each nucleotide is part of o...

Read Full Step-by-Step Solution →

Question #32

Practice Question

A.One codon codes for multiple amino acids
B.Multiple codons code for one amino acid
C.Codons do not overlap
D.Each codon is unique

Concept Applied

Degeneracy: more than one codon specifies the same amino acid (e.g., UCU, UCC → Serine)....

Read Full Step-by-Step Solution →

Question #33

Practice Question

A.Degeneracy
B.Ambiguity
C.Universality
D.Non-overlapping

Concept Applied

Degeneracy means multiple codons code for the same amino acid....

Read Full Step-by-Step Solution →

Question #34

Practice Question

A.Bound to operator
B.Not synthesized
C.Bound to inducer
D.Free in cytoplasm

Concept Applied

Without lactose, repressor remains active and binds operator, blocking transcription....

Read Full Step-by-Step Solution →

Question #35

Practice Question

A.It acts as a corepressor, enabling the repressor to bind the operator.
B.It acts as an inducer by binding to the repressor, preventing it from binding to the operator.
C.It directly binds to the promoter region to enhance transcription.
D.It degrades the mRNA of the operon, reducing protein synthesis.

Concept Applied

Allolactose binds to the lac repressor, causing a conformational change that reduces the repressor's affinity for the operator. This lifts repression ...

Read Full Step-by-Step Solution →

Question #36

Practice Question

A.Coding strand
B.Anticoding strand
C.Sense strand
D.Template strand

Concept Applied

Template strand is complementary; mRNA is synthesized 5'→3' using it....

Read Full Step-by-Step Solution →

Question #37

Practice Question

A.Template strand
B.Coding strand
C.Sense strand
D.Leading strand

Concept Applied

RNA polymerase uses the template (antisense) strand to synthesize mRNA....

Read Full Step-by-Step Solution →

Question #38

Practice Question

A.The code is degenerate and non‑overlapping.
B.The code is overlapping, so a single nucleotide can belong to more than one codon.
C.The code is ambiguous; a codon can code for more than one amino acid.
D.The code is non‑degenerate; each codon specifies a unique amino acid.

Concept Applied

The genetic code is degenerate because several codons can code for the same amino acid, and it is non‑overlapping because each nucleotide is part of o...

Read Full Step-by-Step Solution →

Question #39

Practice Question

A.One codon codes for multiple amino acids
B.Multiple codons code for one amino acid
C.Codons do not overlap
D.Each codon is unique

Concept Applied

Degeneracy: more than one codon specifies the same amino acid (e.g., UCU, UCC → Serine)....

Read Full Step-by-Step Solution →

Question #40

Practice Question

A.Degeneracy
B.Ambiguity
C.Universality
D.Non-overlapping

Concept Applied

Degeneracy means multiple codons code for the same amino acid....

Read Full Step-by-Step Solution →

Question #41

Practice Question

A.Bound to operator
B.Not synthesized
C.Bound to inducer
D.Free in cytoplasm

Concept Applied

Without lactose, repressor remains active and binds operator, blocking transcription....

Read Full Step-by-Step Solution →

Question #42

Practice Question

A.It acts as a corepressor, enabling the repressor to bind the operator.
B.It acts as an inducer by binding to the repressor, preventing it from binding to the operator.
C.It directly binds to the promoter region to enhance transcription.
D.It degrades the mRNA of the operon, reducing protein synthesis.

Concept Applied

Allolactose binds to the lac repressor, causing a conformational change that reduces the repressor's affinity for the operator. This lifts repression ...

Read Full Step-by-Step Solution →
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