Question 1

Which nitrogenous base is a purine that pairs with cytosine and is found in both DNA and RNA?

Accepted Answer

Guanine (G)

Question 2

Which nitrogenous base is found only in RNA and pairs with adenine?

Accepted Answer

Uracil (U)

Question 3

Which of the following statements about nitrogenous bases is correct?

Accepted Answer

Uracil is a pyrimidine found only in RNA.

Question 4

If a DNA molecule contains 30% adenine, what percentage of its bases would be thymine?

Accepted Answer

$$30\%$$

Question 5

Which base pairing is unique to DNA and does not occur in RNA?

Accepted Answer

Adenine–Thymine

Question 6

Which of the following is a pyrimidine found in both DNA and RNA?

Accepted Answer

Cytosine (C)

Question 7

During transcription, which base replaces thymine in the RNA transcript?

Accepted Answer

Uracil (U)

Question 8

Which of the following correctly matches the nitrogen base with its family?

Accepted Answer

Guanine – Purine

Question 9

A mutation replaces a thymine with a uracil in a DNA molecule. What is the most likely consequence?

Accepted Answer

The DNA may be recognized as damaged, since uracil is not normally found in DNA.

Question 10

Which of the following base pairs is NOT possible in a normal DNA double helix?

Accepted Answer

Adenine–Uracil

Genetics and Molecular Biology: Structure, Function, and Mutations

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