Multiple Choice
Proteins are polymers constructed from which type of monomers?
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3. Amino Acids
Amino Acid Groups
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All of the following are components that make up a standard amino acid except:
A
A carboxyl group (\(-COOH\))
B
A phosphate group (\(-PO_4^{3-}\))
C
An amino group (\(-NH_2\))
D
A side chain (R group)
Verified step by step guidance1
Understand the structure of a standard amino acid: A standard amino acid consists of a central carbon atom (the alpha carbon) bonded to four groups: a carboxyl group (
), an amino group (
), a hydrogen atom, and a variable side chain (R group).
Review the options provided in the question: The options include a carboxyl group (
), an amino group (
), a side chain (R group), and a phosphate group (
).
Identify the components that are part of a standard amino acid: The carboxyl group (
), amino group (
), and side chain (R group) are all standard components of an amino acid.
Recognize that the phosphate group (
) is not a component of a standard amino acid. Phosphate groups are typically found in nucleotides and other biomolecules, not amino acids.
Conclude that the correct answer is the phosphate group (
), as it is not part of the standard structure of an amino acid.
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