Multiple Choice
Which nitrogenous base is found in DNA but not in RNA?
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7. DNA and Chromosome Structure
DNA Structure
Multiple Choice
Which feature pertains to DNA but not to RNA under typical cellular conditions?
A
Uses uracil as a nitrogenous base instead of thymine
B
Is usually single-stranded rather than double-stranded
C
Functions primarily as a messenger molecule that carries coding information from the nucleus to ribosomes
D
Contains the sugar deoxyribose (lacks a -hydroxyl group on the pentose)
Verified step by step guidance1
Identify the key structural differences between DNA and RNA, focusing on their sugar components and nitrogenous bases.
Recall that DNA contains the sugar deoxyribose, which lacks an oxygen atom on the 2' carbon of the sugar ring, whereas RNA contains ribose, which has a hydroxyl group (-OH) at this position.
Understand that DNA typically uses thymine as a nitrogenous base, while RNA uses uracil instead of thymine.
Note that DNA is usually double-stranded, forming a double helix, whereas RNA is usually single-stranded.
Recognize that RNA often functions as a messenger molecule (mRNA) carrying coding information from the nucleus to ribosomes, a role not typical for DNA.
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