Multiple Choice
Which sugar is found in RNA?
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1. Introduction to Biochemistry
Nucleic Acids
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Which of the following polymers contains repeating units known as nucleotides?
A
Starch
B
Cellulose
C
Collagen
D
DNA
Verified step by step guidance1
Step 1: Understand the structure of nucleotides. Nucleotides are the building blocks of nucleic acids, consisting of three components: a phosphate group, a sugar (either ribose or deoxyribose), and a nitrogenous base (adenine, thymine, cytosine, guanine, or uracil).
Step 2: Identify the type of polymer that is composed of nucleotides. Nucleotides are the repeating units in nucleic acids, such as DNA and RNA. These polymers store genetic information and are involved in protein synthesis.
Step 3: Examine the given options. Starch and cellulose are polysaccharides made of repeating glucose units, and collagen is a protein composed of amino acids. None of these are composed of nucleotides.
Step 4: Recognize that DNA is a nucleic acid polymer composed of repeating nucleotide units. DNA's structure includes a sugar-phosphate backbone and nitrogenous bases that pair to form the double helix.
Step 5: Conclude that the correct answer is DNA, as it is the only polymer in the list that contains nucleotides as its repeating units.
