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In a certain DNA molecule, the composition is 30% thymine (T) and 20% cytosine (C). If the total number of base pairs is 500, how many thymine bases are present?

Question

In a certain DNA molecule, the composition is 30% thymine (T) and 20% cytosine (C). If the total number of base pairs is 500, how many thymine bases are present?

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Solution

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  1. We know that in a DNA molecule, thymine (T) always pairs with adenine (A), and cytosine (C) always pairs with guanine (G). This is known as base pairing.

  2. Given that the composition of thymine (T) is 30%, it means that adenine (A) is also 30% because of the base pairing rule.

  3. The total percentage of thymine (T) and adenine (A) is therefore 30% + 30% = 60%.

  4. If the total number of base pairs is 500, then the number of thymine (T) bases is 30% of 500.

  5. To calculate this, you multiply 500 by 30% (or 0.30 in decimal form).

  6. So, the number of thymine (T) bases is 500 * 0.30 = 150.

Therefore, there are 150 thymine bases present in the DNA molecule.

This problem has been solved

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