Multiple Choice
How many hydrogen bonds are formed between adenine and thymine in the double DNA helix?
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7. DNA and Chromosome Structure
DNA Structure
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
Which components form the backbone of a DNA molecule?
A
Amino acids and ribose sugars
B
Alternating deoxyribose sugars and phosphate groups
C
Nitrogenous bases only
D
Phosphate groups and uracil
Verified step by step guidance1
Recall the basic structure of a DNA molecule, which consists of a sugar-phosphate backbone and nitrogenous bases attached to the sugars.
Identify the sugar involved in DNA, which is deoxyribose, a five-carbon sugar lacking one oxygen atom compared to ribose found in RNA.
Understand that the backbone 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 do not form the backbone itself.
Conclude that the correct components forming the DNA backbone are alternating deoxyribose sugars and phosphate groups.
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