Practice Quiz

Praxis II: Biology Content Knowledge Exam Prep

Category - Biology

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Which of the following is a correct paring of nitrogenous bases in DNA?
  1. Cytosine and uracil
  2. Adenine and guanine
  3. Thymine and cytocine
  4. Cytosine and guanine
  5. Guanine and uracil
Explanation
Answer: D, The correct pairing of nitrogenous bases in DNA is cytosine and guanine. In DNA, guanine pairs with cytosine and adenine pairs with thymine.

Key Takeaway: In DNA, one purine is paired with one pyrimidine. The purine adenine pairs with the pyridine thymine and the purine guanine pairs with the pyrimidine cytocine. Uracil is another pyrimidine, but it is only found in RNA, not DNA. In RNA, uracil replaces thymine and pairs with adenine.
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