Multiple Choice
In double-stranded DNA, adenine (A) forms complementary base pairs with which nitrogenous base?
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7. DNA and Chromosome Structure
DNA Structure
Multiple Choice
DNA and RNA both contain a ___-carbon sugar.
A
4
B
6
C
5
D
3
Verified step by step guidance1
Recall the structure of nucleotides, which are the building blocks of both DNA and RNA. Each nucleotide consists of a nitrogenous base, a phosphate group, and a sugar molecule.
Identify the type of sugar present in DNA and RNA. DNA contains deoxyribose sugar, while RNA contains ribose sugar.
Understand that both deoxyribose and ribose are pentose sugars, meaning they have five carbon atoms in their sugar ring.
Recognize that the carbon atoms in these sugars are numbered from 1' to 5', which is important for understanding nucleotide structure and bonding.
Conclude that since both DNA and RNA contain a sugar with five carbon atoms, the correct answer to the question is 5.
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