If a DNA strand has 35 cytosines how many adenine are there?

You will not be permitted to use any study aids during an exam or quiz, so the best way to prepare is to read the material and comprehend the concepts that you have been asked to learn. By doing this, you will be able to answer a wide variety of questions.

Deoxyribonucleic acid (DNA) is a polymer of nucleotides that contains three components: a phosphate group, a nitrogen base, and a sugar with five carbons called deoxyribose. DNA is used to store genetic information in cells.

Adenine, thymine, cytosine, and guanine are the four nitrogen bases that make up DNA. The first letter of each base is commonly used to represent the corresponding nucleotide (A for adenine nucleotide, for example).

Adenine always forms a bond with thymine, and cytosine always forms a bond with guanine, forming a double helix, a two-stranded spiral in DNA.

That is all the information you can get from this. Just because there are 35 C and G, there doesn't mean that there must be an equal number of A and T. Since you have 35 C, you will also have 35 G. The number of adenine is unknown without knowing the number of thymine.

35 Adenine bases.