DNA
DOUBLE HELIX · BASE PAIRS
prostudypk.com
The Code of Life
A
Adenine
T
Thymine
G
Guanine
C
Cytosine
A=T · G≡C
4 bases
A · T · G · C
A–T
2 hydrogen bonds
G–C
3 hydrogen bonds
1. What is DNA?
Deoxyribonucleic Acid
In the nucleus · genetic information
2. Pairing Rule
A always pairs with T, G always with C
One strand ATGC → the other TACG
3. Remember
Watson & Crick (1953)
Gene = a section of DNA
MATRIC BIOLOGY · INHERITANCE · PUNJAB BOARDS
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