Multiple Choice
In the context of DNA structure, RNA and DNA are examples of which type of biomolecule?
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7. DNA and Chromosome Structure
DNA Structure
Multiple Choice
In DNA structure, the backbone of DNA is primarily made up of which components?
A
Alternating nitrogenous bases and phosphate groups
B
Alternating ribose sugars and phosphate groups
C
Alternating amino acids and deoxyribose sugars
D
Alternating deoxyribose sugars and phosphate groups
Verified step by step guidance1
Recall the basic structure of DNA, which consists of a sugar-phosphate backbone and nitrogenous bases attached to the sugars.
Identify the sugar present in DNA, which is deoxyribose, a five-carbon sugar lacking one oxygen atom compared to ribose found in RNA.
Understand that the backbone of DNA is formed by alternating units of deoxyribose sugars and phosphate groups linked by phosphodiester bonds.
Recognize that nitrogenous bases (adenine, thymine, cytosine, guanine) are attached to the deoxyribose sugars but are not part of the backbone itself.
Conclude that the correct components forming the DNA backbone are alternating deoxyribose sugars and phosphate groups.
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