If a strand of DNA has 45% A, what percent will be C?

Explanation:

There is a method to calculating base percentages known as Chargaff's Rule. It states:

We know the DNA has 45% Adenine or A.

Adenine always pairs equally with Thymine. In other words, the percentage of adenine equals the percentage of thymine (45% Thymine or T).

Subtract 90% from both sides.

Cytosine(C) and Guanine(G) pair equally and their percentages will be equal. We can divide 10% by 2.

The percentage of Cytosine or C is 5 percent.

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explanation:

the relative atomic mass of an element is the mass of one atom of that element, relative to 1/12th of the mass of a  1212c atom. to convert to an absolute mass in kg, it is necessary to multiply by  1.661×10−271.661×10−27.

the relative atomic mass is roughly equal to the number of neutrons, plus the number of protons, in the nucleus of the atom.

for elements with more than one stable isotope (different types of nucleus with different numbers of neutrons but the same number of protons), the quoted mass is usually the average mass, weighted by the relative abundance of the different isotopes.