Multiple Choice
Which of the following molecules is the pentose sugar found in RNA?
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1. Introduction to Biochemistry
Nucleic Acids
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In nucleic acids, what is the monomer called if it lacks a phosphate group?
A
Nucleoside
B
Nucleotide
C
Polynucleotide
D
Amino acid
Verified step by step guidance1
Understand the structure of nucleic acids: Nucleic acids are polymers made up of monomers called nucleotides. Each nucleotide consists of three components: a phosphate group, a sugar (ribose or deoxyribose), and a nitrogenous base.
Identify the difference between a nucleotide and a nucleoside: A nucleotide contains all three components (phosphate group, sugar, and nitrogenous base), while a nucleoside lacks the phosphate group and consists only of the sugar and nitrogenous base.
Eliminate incorrect options: Polynucleotide refers to a chain of nucleotides, not a single monomer. Amino acid is a building block of proteins, not nucleic acids.
Focus on the correct terminology: Since the monomer lacks a phosphate group, it is called a nucleoside, not a nucleotide.
Conclude the reasoning: The correct answer is 'Nucleoside' because it matches the description of a nucleic acid monomer that lacks a phosphate group.
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