HARD
12th CBSE
IMPORTANT
Earn 100

Explain how a polycistronic structural gene is regulated by a common promoter and a combination of regulatory genes in a lac operon.

Important Questions on Molecular Basis of Inheritance

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
MEDIUM
12th CBSE
IMPORTANT
TRUEMAN'S ELEMENTARY Biology VOL. II For XII Class of 10+2>Chapter 6 - Molecular Basis of Inheritance>TEST QUESTIONS>Q (3)
Whose experiments cracked DNA and discovered triplet nature of genetic code?