Question

In a sample of DNA with 1600 bases, number of Adenine is 200. Any idea what would be number of Cytosine?

Answer 1

DNA is a double helix with paired bases. Adenine, Thymine, Cytosine and Guanine are four nitrogenous bases of DNA.

Adenine always pairs with thymine, hence number of thymine in the sample will be same as adenine, i.e. 200.

Then total number of cytosine and guanine would be
`1600 - 400` i.e. `1200`.

Cytosine always pairs with guanine, hence these are also present in equal number in the sample, i.e. cytosine 600 and guanine 600.