Biomolecules

| 135

NH2

N

N

H

N

N

Adenine

O

N

N

H

HN

Guanine

H N

2

Purine

Pyrimidine

NH2

N

H

N

Cytosine

O

O

N

H

HN

Uracil

O

O

N

H

HN

Thymine

O

CH3

ÑÜÇLËØSÏDË

Nitrogenous base attached to a sugar

Nitrogen base

+

Sugar

=

Nucleoside

Adenine

+

Sugar

=

Adenosine

Guanine

+

Sugar

=

Guanosine

Cytosine

+

Sugar

=

Cytidine

Thymine

+

Sugar

=

Thymidine

Uracil

+

Sugar

=

Uridine

OH

OH

HOCH2

Adenine

O

Adenosine

OH

OH

HOCH2

Uracil

O

Uridine

ÑÜÇLËØTÏDË

Nitrogenous base attached to a sugar which is esterified to a phosphate

group.