Which of the following bases is a purine?

Unlock all questions

This demo includes only 20 questions. Upgrade to access hundreds of questions, flashcards, exam simulations, and disable ads.

Full question bankExam simulationsFlashcards
From $25.99Unlock all

Study for the Biochemistry Module 6 Exam. Study with flashcards and multiple choice questions; each question includes hints and explanations. Gear up to ace your test!

Multiple Choice

Which of the following bases is a purine?

Explanation:
Purines are the two-ring nucleobases. Among the bases, adenine and guanine are purines, while cytosine, thymine, and uracil are pyrimidines (which have a single ring). Since guanine has the two-ring structure, it is the purine in this set. In DNA, purines pair with pyrimidines (guanine pairs with cytosine via three hydrogen bonds; adenine with thymine via two), helping maintain the uniform width of the helix. In RNA, thymine is replaced by uracil, but both thymine and uracil are pyrimidines.

Purines are the two-ring nucleobases. Among the bases, adenine and guanine are purines, while cytosine, thymine, and uracil are pyrimidines (which have a single ring). Since guanine has the two-ring structure, it is the purine in this set. In DNA, purines pair with pyrimidines (guanine pairs with cytosine via three hydrogen bonds; adenine with thymine via two), helping maintain the uniform width of the helix. In RNA, thymine is replaced by uracil, but both thymine and uracil are pyrimidines.

More Multiple Choice Questions
Subscribe

Get the latest from Passetra

You can unsubscribe at any time. Read our privacy policy