An operon is a unit made up of a set of genes that control other genes that are responsible for protein synthesis. All the genes in an operon are either expressed together or not expressed at all. The operon is made up of an operator, promoter, regulator, and structural genes.

TRUEMAN'S ELEMENTARY Biology VOL. II For XII Class of 10+2>Chapter 6 - Molecular Basis of Inheritance>TEST QUESTIONS>Q 14

HARD

12th CBSE

IMPORTANT

Earn 100

Explain the role of lactose as an inducer in Lac Operon.

Important Questions on Molecular Basis of Inheritance

EASY

12th CBSE

IMPORTANT

TRUEMAN'S ELEMENTARY Biology VOL. II For XII Class of 10+2>Chapter 6 - Molecular Basis of Inheritance>TEST QUESTIONS>Q 16

What is an operon?

HARD

12th CBSE

IMPORTANT

TRUEMAN'S ELEMENTARY Biology VOL. II For XII Class of 10+2>Chapter 6 - Molecular Basis of Inheritance>TEST QUESTIONS>Q 17

The absence of lactose in the culture medium affects the expression of a lac operon in E.coli. Why and how? Explain.

HARD

12th CBSE

IMPORTANT

TRUEMAN'S ELEMENTARY Biology VOL. II For XII Class of 10+2>Chapter 6 - Molecular Basis of Inheritance>TEST QUESTIONS>Q 17

Write two ways in which gene expression is regulated in eukaryotes.

HARD

12th CBSE

IMPORTANT

TRUEMAN'S ELEMENTARY Biology VOL. II For XII Class of 10+2>Chapter 6 - Molecular Basis of Inheritance>TEST QUESTIONS>Q 18

State the "Central Dogma" as proposed by Francis Crick. Is there any exception to it? Support your answer with a reason and an example.

HARD

12th CBSE

IMPORTANT

TRUEMAN'S ELEMENTARY Biology VOL. II For XII Class of 10+2>Chapter 6 - Molecular Basis of Inheritance>TEST QUESTIONS>Q 18

Explain how the biochemical characterisation of 'transforming principle' was determined which was not defined from Griffiths experiments.

HARD

12th CBSE

IMPORTANT

TRUEMAN'S ELEMENTARY Biology VOL. II For XII Class of 10+2>Chapter 6 - Molecular Basis of Inheritance>TEST QUESTIONS>Q 1

In a maternity clinic, for some reasons, two newborns got mixed up. How will it be possible to find out the identity of the neonates as to their real parents?

HARD

12th CBSE

IMPORTANT

TRUEMAN'S ELEMENTARY Biology VOL. II For XII Class of 10+2>Chapter 6 - Molecular Basis of Inheritance>TEST QUESTIONS>Q 2

Griffith factor was found to be DNA/gene by Avery et al. What values are depicted by the two discoveries?

HARD

12th CBSE

IMPORTANT

TRUEMAN'S ELEMENTARY Biology VOL. II For XII Class of 10+2>Chapter 6 - Molecular Basis of Inheritance>TEST QUESTIONS>Q (1)

The number of triplet codons having all the three bases same in 64 triplet codons is