Question

A segment of DNA contains 1400 nucleotides, of which 400 are adenine bases. The number of cytosine bases on this segment of DNA are
(A) 400.
(B) 300.
(C) 200.
(D) 500​

Answer 1

Answer:

B

Explanation:

• Total nucleotide is 1400
• given Adenine is 400
• we know that A=T [T= 400]
• G=C
• And ask to find cystosine

we know that

purine = pyrimidine[A+G=T+C]

A+T =400+400=800

1400-800=600

=600/2

=300

So cystosine is 300