Multiple Choice
In DNA, which nitrogenous base always pairs with adenine (A) according to complementary base-pairing rules?
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7. DNA and Chromosome Structure
DNA Structure
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In DNA structure, what is the backbone of a DNA strand primarily made of?
A
Alternating deoxyribose sugars and nitrogenous bases
B
Alternating phosphate groups and hydrogen bonds
C
Alternating deoxyribose sugars and phosphate groups (a sugar-phosphate backbone)
D
Alternating nitrogenous bases and phosphate groups
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