Textbook Question
Circle and name the functional groups in this organic molecule. What type of compound is this?
For which class of macromolecules is it a monomer?
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4. Biomolecules
Functional Groups
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Which of the following functional groups is present in all amino acids?
A
—SH
B
—COH
C
—OH
D
—NH2
Verified step by step guidance1
Understand that amino acids are the building blocks of proteins and have a general structure consisting of a central carbon atom (alpha carbon) bonded to four different groups.
Identify the four groups attached to the central carbon in an amino acid: an amino group (—NH2), a carboxyl group (—COOH), a hydrogen atom, and a variable R group (side chain).
Recognize that the amino group (—NH2) is a defining feature of amino acids, as it is present in all amino acids and contributes to their basic properties.
Consider the other options: —SH (sulfhydryl group), —COH (aldehyde group), and —OH (hydroxyl group). These groups are not present in all amino acids, although they may appear in specific side chains of certain amino acids.
Conclude that the amino group (—NH2) is the functional group present in all amino acids, distinguishing them from other organic molecules.
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