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Multiple Choice
Which is the subunit of DNA, and what is its primary function?
A
Amino acid; catalyzes biochemical reactions
B
Nucleotide; stores genetic information
C
Fatty acid; forms cell membranes
D
Monosaccharide; provides energy
Verified step by step guidance
1
Identify the subunit of DNA: DNA is composed of repeating units called nucleotides.
Understand the structure of a nucleotide: Each nucleotide consists of three components - a phosphate group, a sugar molecule (deoxyribose in DNA), and a nitrogenous base (adenine, thymine, cytosine, or guanine).
Recognize the primary function of nucleotides in DNA: Nucleotides are responsible for storing and transmitting genetic information.
Differentiate between the options provided: Amino acids are the building blocks of proteins and are involved in catalyzing biochemical reactions. Fatty acids are components of lipids and are involved in forming cell membranes. Monosaccharides are simple sugars that provide energy.
Conclude that the correct subunit of DNA is the nucleotide, which primarily functions to store genetic information.