QQuestionAnatomy and Physiology
QuestionAnatomy and Physiology
"What are the three components of a DNA nucleotide?
A. A sugar, a phosphate, and a peptide
B. A sugar, a base, and a polypeptide
C. A sugar, a phosphate, and a base
D. A phosphate, a base, and a polypeptide"
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Answer
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Step 1: Identify the components of a DNA nucleotide.
A DNA nucleotide consists of a sugar molecule, a phosphate group, and a nitrogenous base.
Step 2: Identify the correct answer based on the components.
Option A: A sugar, a phosphate, and a peptide. This is incorrect because a peptide is a compound made of amino acids, not a component of a DNA nucleotide. Option B: A sugar, a base, and a polypeptide. This is incorrect because a polypeptide is a compound made of amino acids, not a component of a DNA nucleotide. Also, the nitrogenous base is incorrectly referred to as "a base." Option C: A sugar, a phosphate, and a base. This is correct. The sugar is deoxyribose, the phosphate group forms part of the backbone of the DNA molecule, and the base is one of the four nitrogenous bases (adenine, thymine, guanine, or cytosine). Option D: A phosphate, a base, and a polypeptide. This is incorrect because a phosphate group and a base are correct, but a polypeptide is not a component of a DNA nucleotide.
Final Answer
The correct answer is option C: A sugar, a phosphate, and a base.
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