Multiple Choice
In the structure of DNA, which nitrogenous base forms complementary hydrogen bonds with thymine?
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7. DNA and Chromosome Structure
DNA Structure
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Which of the following lists correctly identifies the four nitrogenous bases found in DNA?
A
Adenine, Thymine, Guanine, Lysine
B
Adenine, Thymine, Guanine, Cytosine
C
Adenine, Uracil, Guanine, Cytosine
D
Adenine, Thymine, Guanine, Uracil
Verified step by step guidance1
Step 1: Understand that DNA is composed of four nitrogenous bases which pair specifically to form the rungs of the DNA double helix.
Step 2: Recall the four nitrogenous bases found in DNA: Adenine (A), Thymine (T), Guanine (G), and Cytosine (C).
Step 3: Recognize that Uracil (U) is found in RNA, not DNA, so any list containing Uracil is incorrect for DNA bases.
Step 4: Identify that Lysine is an amino acid, not a nitrogenous base, so any list containing Lysine is incorrect.
Step 5: Conclude that the correct list of DNA nitrogenous bases is Adenine, Thymine, Guanine, and Cytosine.
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