NCERT Solutions for Class 12 Biology Chapter 11 Biotechnology: Principles and Processes
Important Board Questions
Biotechnology: Principles and Processes
NCERT Books for Session 2022-2023
CBSE Board and UP Board
Question : 12
Discuss with your teacher and find out how to distinguish between (a) Plasmid DNA and Chromosomal DNA (b) RNA and DNA (c) Exonuclease and Endonuclease
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(a) Plasmid DNA and Chromosomal DNA
Plasmid DNA:- Plasmid DNA is an extra-chromosomal DNA molecule in bacteria that is capable of replicating, independent of chromosomal DNA.
Chromosomal DNA:- Chromosomal DNA is the entire DNA of an organism present inside chromosomes.
(b) RNA and DNA
RNA:-
1. RNA is a single stranded molecule.
2. It contains ribose sugar.
3. The pyrimidines in RNA are adenine and uracil.
4. RNA cannot replicate itself.
5. It is a component of the ribosomes.
DNA:-
1. DNA is a double stranded molecule.
2. It contains deoxyribose sugar.
3. The pyrimidines in DNA are adenine and thymine.
4. DNA molecules have the ability to replicate.
5. It is a component of the chromosomes.
(c) Exonuclease and Endonuclease:-
Exonuclease:- It is a type of restriction enzyme that removes the nucleotide from 5’or 3′ ends of the DNA molecule.
Endonuclease:- It is a type of restriction enzyme that makes a cut within the DNA at a specific site to generate sticky ends.
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