Multiple Choice
Which of the following statements about the DNA in one of your brain cells is true?
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7. DNA and Chromosome Structure
DNA as the Genetic Material
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Which of the following components is NOT a part of the DNA molecule?
A
Adenine base
B
Deoxyribose sugar
C
Phosphate group
D
Uracil base
Verified step by step guidance1
Recall the basic structure of a DNA molecule, which consists of three main components: a nitrogenous base, a sugar, and a phosphate group.
Identify the nitrogenous bases found in DNA: adenine (A), thymine (T), cytosine (C), and guanine (G). These bases pair specifically (A with T, C with G).
Recognize that the sugar in DNA is deoxyribose, a five-carbon sugar that lacks one oxygen atom compared to ribose found in RNA.
Understand that the phosphate group links the sugar molecules together, forming the sugar-phosphate backbone of the DNA strand.
Note that uracil (U) is a nitrogenous base found in RNA, replacing thymine, and is therefore NOT a component of DNA.
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