Made up of:-
- Organic base (adenine, thymine, cytosine or guanine)
- Molecule of deoxyribose
- Phosphate group
A nucleotide containig th base cytosine always paired with one containing guanine. This is the base-pairing rule.
Adenine and thymine are said to be complementary bases, as are cytosine and guanine.
2 strands are said to be anti-parallel. The start or top of one strand is paired with the end or bottom of the other.
Covalent bonds holding the nucleotides together in each strand are stronger than the hydrogen bonds holding the 2 strands together. Strong covalent bonds ensure that the structure of each strand is stable.
Comments
No comments have yet been made