Question

ATP is a

• A. nucleotide
• B. nucleosome
• C. purine base
• D. nucleoside

Answer 1

Answer: (A)

A nucleotide contains
(a) a $5-C$ sugar,
(b) a phosphate molecule and
(c) a nitrogenous base.
ATP is a nucleotide. It also has a $5-C$ sugar (ribose), $3$ phosphate molecules and a nitrogenous base (adenine).

Adenine + sugar (ribose) $⟶$ Adenosine
Adenosine $+1$ phosphate $⟶$ Adenosine Mono Phosphate (AMP)
AMP $+1$ phosphate $⟶$ Adenosine Di Phosphate (ADP)
ADP $+1$ phosphate $⟶$ Adenosine Tri Phosphate (ATP)