Multiple Choice
Which of the following DNA molecules is the shortest in length?
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7. DNA and Chromosome Structure
DNA Structure
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Which two components make up the backbone of the DNA double helix?
A
Adenine and thymine
B
Ribose sugar and uracil
C
Guanine and cytosine
D
Deoxyribose sugar and phosphate group
Verified step by step guidance1
Recall the structure of DNA, which is composed of nucleotides linked together to form a double helix.
Understand that each nucleotide consists of three parts: a phosphate group, a sugar molecule, and a nitrogenous base.
Identify that the backbone of the DNA strand is formed by the sugar and phosphate groups linked together through phosphodiester bonds.
Recognize that the nitrogenous bases (adenine, thymine, guanine, cytosine) are attached to the sugar and pair with bases on the opposite strand, but they do not form the backbone.
Conclude that the two components making up the backbone of the DNA double helix are the deoxyribose sugar and the phosphate group.
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