Glossary 3.2

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The glossary provides definitions and explanations of key terms and concepts essential to understand the topic in the lesson. Be sure to familiarize yourself with each term before attempting the lesson glossary quiz.

Browse the glossary using this index

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P

Plasmid

a small circular section of DNA found in the cytosol of bacteria; replicates independently of the chromosomal DNA

Purine

a class of nitrongenous bases with a double-ring structure; adenine and guanine are purines

Pyrimidine

a class of nitrogenous bases with a single-ring structure; thymine and cytosine are pyrimidines