# How many adenine and thymine are in each DNA molecule?

## How many adenine and thymine are in each DNA molecule?

There are four nitrogenous bases in DNA, two purines (adenine and guanine) and two pyrimidines (cytosine and thymine). A DNA molecule is composed of two strands. Each strand is composed of nucleotides bonded together covalently between the phosphate group of one and the deoxyribose sugar of the next.

## How do you calculate the percentage of adenine in DNA?

According to Chargaff rule,

1. Here adenine residues =120, cytosine residues = 120.
2. there fore total number of nucleotides = [A] + [T]+ [C]+[G] =120 X 4 = 480.
3. In humans, there is approximately 30\% adenine.
4. According to Chargaff’s rule, [A]+[G]=[C]+[T]
5. Here [A]=30\% therefore \% of [T] is also 30\%.
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How many adenine does DNA have?

Since there are 100 nucleotides in this strand and 25 adenine bases, then that must mean that there are also 25 thymine bases.

How many of each base is found in the complete double-stranded molecule?

According to Watson-Crick base-pairing, which forms the basis for the helical configuration of double-stranded DNA, DNA contains four bases: the two purines adenine (A) and guanine (G) and the two pyrimidines cytosine (C) and thymine (T).

### What is the percentage of guanine in a DNA sample?

In the question, the DNA sample referred is a single stranded DNA. 4. In DNA, guanine is 10\%. If guanine=10\% as guanine will always pair with cytosine, i.e.cytosine is also 10\% then adenine and thymine accounts 80\% as adenine will always pair with thymine.

### What is the percentage of adenine and cytosine in DNA?

A segment of DNA has 120 adenine and 120 cytosine bases. The total number of nucleotides present in the segment is 2. In humans, there is approximately 30\% adenine. What is the percentage of other nitrogenous bases?

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