Multiple Choice
In nucleic acid synthesis, which enzyme catalyzes the formation of phosphodiester bonds that covalently link nucleotides together in a growing DNA strand?
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1. Introduction to Biochemistry
Nucleic Acids
Multiple Choice
In the context of nucleic acids, what type of organic molecule is ATP (adenosine triphosphate)?
A
A polypeptide
B
A triglyceride
C
A polysaccharide
D
A nucleotide
Verified step by step guidance1
Recall the main classes of biological macromolecules: polypeptides (proteins), triglycerides (fats), polysaccharides (carbohydrates), and nucleotides (the building blocks of nucleic acids).
Understand that ATP (adenosine triphosphate) consists of a nitrogenous base (adenine), a sugar (ribose), and three phosphate groups, which matches the structure of a nucleotide.
Recognize that nucleotides are the monomer units of nucleic acids like DNA and RNA, and ATP is a nucleotide involved in energy transfer within cells.
Eliminate other options: polypeptides are made of amino acids, triglycerides are composed of glycerol and fatty acids, and polysaccharides are long chains of sugars, none of which fit ATP's structure.
Conclude that ATP is classified as a nucleotide because of its molecular components and biological role.
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