How many different nitrogenous bases are listed in the material?

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Multiple Choice

How many different nitrogenous bases are listed in the material?

Explanation:
Counting the distinct nitrogenous bases mentioned requires looking at both DNA and RNA. DNA uses adenine, thymine, cytosine, and guanine. RNA uses adenine, uracil, cytosine, and guanine. Since thymine and uracil are different bases, listing both DNA and RNA bases gives five unique bases: adenine, thymine, cytosine, guanine, and uracil. If only DNA were considered, there would be four. The material’s inclusion of uracil (from RNA) alongside the DNA bases is why five is the correct count.

Counting the distinct nitrogenous bases mentioned requires looking at both DNA and RNA. DNA uses adenine, thymine, cytosine, and guanine. RNA uses adenine, uracil, cytosine, and guanine. Since thymine and uracil are different bases, listing both DNA and RNA bases gives five unique bases: adenine, thymine, cytosine, guanine, and uracil. If only DNA were considered, there would be four. The material’s inclusion of uracil (from RNA) alongside the DNA bases is why five is the correct count.

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