Which term describes a nitrogenous base with a single ring?

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Study for the Biochemistry Module 6 Exam. Practice with multiple-choice questions and detailed explanations. Master your biochemistry knowledge with structured revisions and personalized feedback. Prepare to excel!

Multiple Choice

Which term describes a nitrogenous base with a single ring?

Explanation:
The key idea is that the number of rings in a nitrogenous base defines its class: bases with a single ring are pyrimidines, while those with two fused rings are purines. So a nitrogenous base with one ring is called a pyrimidine. Examples include cytosine, thymine, and uracil. This distinguishes the base itself from structures like nucleosides or nucleotides, which refer to the base bound to sugar (and possibly phosphate) rather than the ring count of the base.

The key idea is that the number of rings in a nitrogenous base defines its class: bases with a single ring are pyrimidines, while those with two fused rings are purines. So a nitrogenous base with one ring is called a pyrimidine. Examples include cytosine, thymine, and uracil. This distinguishes the base itself from structures like nucleosides or nucleotides, which refer to the base bound to sugar (and possibly phosphate) rather than the ring count of the base.

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