MCQ ON NATURE OF GENE : ITS EXPRESSION AND REGULATION class 12 for NEET

MCQ ON NATURE OF GENE : ITS EXPRESSION AND REGULATION class 12 for NEET | NATURE OF GENE ITS EXPRESSION AND REGULATION class 12 | MCQ NATURE OF GENE : ITS EXPRESSION AND REGULATION with Answer | Check the below NCERT MCQ question for class 12 Biology based on the with Answers.

MCQ on NATURE OF GENE: ITS EXPRESSION AND REGULATION class 12 Biology with answers were prepared based on the latest pattern.We have provided class 12 Biology MCQs question with Answers to help students understand the concept very well.

MCQ ON NATURE OF GENE :- ITS EXPRESSION AND REGULATION is useful for NEET / CSIR / UGC / CBSE / ICSE / AIIMS / EXAM / AFMC EXAM / STATE LEVEL MEDICAL EXAM/ KVS PGT BIOLOGY / NVS PGT BIOLOGY EXAM 2023-2024 ,2025

MCQ ON NATURE OF GENE : ITS EXPRESSION AND REGULATION class 12 for NEET

INTRODUCTION:-
Gregor Johann Mendel is known as father of genetics. The term genetics was coined by Bateson.
Genetics is the study of principal and mechanism of heredity and variations.

Genetics has three branches :
-transmission genetics :- classical mandelian genetics studies transmission of genesfrom generation to generation.

Molecular genetics:- study genes and their working at the molecular level.

Population genetics:- studies distribution spread and changes in gene in population.

Variations:- variations are differences found in morphological physiological cytological and behaviour traits of individuals belonging to same species, race and family.

Variation occurs due to
Crossing over, chance combination of chromosomes during meiosis and fertilization.

Johannsen defined gene to be elementary unit of inheritance that specifies the expression of a particular traits .

Characteristics of genes :-
Gene store and express coded information of hereditary nature.
Genes can undergo replication so that copies can be transmitted to daughter cells as well as offspring.

They can occasionally undergo mutation.
Genes are located over chromosome.
All the genes donot express simultaneously.
There is a system of differential expression.
It results in development and differentiation.

MCQ NATURE OF GENE :- ITS EXPRESSION AND REGULATION class 12 for NEET/KVS PGT BIOLOGY / NVS PGT BIOLOGY EXAM 2023-2024,2025

1. Common reporter gene used in plant expression vector is

(a) TAC
(b) GAT
(c) CAT
(d) TAG

Ans (c) CAT

2. Which is mostly transcribed ?

(a) single copy DNA sequence
(b) Highly repetitive DNA sequence
(c) middle repetitive DNA sequence
(d) only RNA sequence

Ans. (a) single copy DNA sequence

3. DNA element with ability to change its position is

(a) Cistron
(b) Transposon
(c) Introns
(d) Recon

Ans. (b) Transposon

4. Lactose metabolism enzyme produced in the presence of lactose only is

(a) Inducible enzyme
(b) Repressible enzyme
(c) Regulatory enzyme
(d) Constitutive enzyme

Ans.(a) Inducible enzyme

5. Process used by Meselon and Stahl for studying semiconsevative replication of DNA was

(a) Chromotography
(b) Density gradient centrifugation
(c) Buoyancy density centrifugation
(d) Centrifugation

Ans.(b) Density gradient centrifugation

6. Initial step of mRNA maturation is

(a) Endonucleolytic cleavage
(b) 5′ capping
(c) Polyadenylation
(d) Splicing

Ans.(a) Endonucleolytic cleavage

7. Sequence of structural gene of lac operon is

(a) Y, Z , A
(b) Z, Y, A
(c) A, Y, Z
(d) A, Z , Y

Ans.(b) Z, Y ,A

8. Enzyme responsible for DNA chain elongation is

(a) DNA polymerase II
(b) DNA polymerase III
(c) RNA polymerase
(d) DNA ligase

Ans.(b) DNA polymerase III

9. In DNA nitrogen bases are joined to each other by

(a) H – bonds
(b) Peptide bonds
(c) Glycosidic bonds
(d) Phosphodiester bonds

Ans. (a) H- bonds

10. AUG is

(a) ochre
(b) amber
(c) opal
(d) initiation codon

Ans. (d) initiation codon

11. DNA is acidic due to

(a) sugar
(b) purine
(c) phosphoric acid
(d) Pyrimidine

Ans.(c) phosphoric acid

12. RNA primer is used in

a) Translation
b) Replication
c) Conjugation
(d) Transformation

Ans . (b) Replication

13. Portion of DNA having information for an entire polypeptide trait is

(a) Cistron
(b) Recon
(c) Muton
(d) Operon

Ans.(a) Cistron

14. Which of the following has no tRNA ?

(a) UAU
(b) UAA
(c) UGU
(d) UGG

Ans. (b) UAA

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15.Enzyme required for joining DNA fragments is

(a) DNA polymerase
(b) Adenosine deaminases
(c) DNA ligase
(d) Topoisomerase

Ans.(c) DNA ligase

16. DNA gyrase is a type of

(a) DNA Topoisomerase
(b) DNA ligase
(c) DNA polymerase
(d) Reverse transcriptase

Ans.(a) DNA Topoisomerase