Multiple Choice
The nucleotides in the backbone of the DNA strand are held together by what type of bond?
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7. DNA and Chromosome Structure
DNA Structure
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Which components make up the backbone of a DNA molecule?
A
Alternating phosphate groups and deoxyribose sugars
B
Phosphate groups and ribose sugars
C
Deoxyribose sugars and nitrogenous bases
D
Nitrogenous bases and phosphate groups
Verified step by step guidance1
Recall the structure of a DNA molecule, which consists of a sugar-phosphate backbone and nitrogenous bases attached to the sugars.
Identify the sugar present in DNA, which is deoxyribose, distinguishing it from RNA that contains ribose sugar.
Understand that the backbone is formed by alternating units of phosphate groups and deoxyribose sugars linked together by phosphodiester bonds.
Recognize that nitrogenous bases (adenine, thymine, cytosine, guanine) are attached to the deoxyribose sugars but do not form part of the backbone itself.
Conclude that the correct components making up the DNA backbone are the alternating phosphate groups and deoxyribose sugars.
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