Question

what's the answer for this? with explanation.​

Answer 1

Answer:

option no a

please marl as Brainlist

Answer 2

Explanation:

cystosine is a nucleotide

Cytosine is one of the four building blocks of DNA and RNA. So it's one of the four nucleotides that's present both in DNA, RNA, and each cytosine makes up part of the code. Cytosine has the unique property in that it binds in the double helix opposite a guanine, one of the other nucleotides.