Multiple Choice
Which of the following is a functional group commonly found in organic molecules?
2. Molecular Representations
Functional Groups
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Which of the following functional groups is present in all amino acids?
A
Aldehyde group
B
Hydroxyl group
C
Ketone group
D
Carboxyl group
Verified step by step guidance1
Understand the structure of amino acids: Amino acids are organic compounds that contain both an amino group (\(\text{-NH}_2\)) and a carboxyl group (\(\text{-COOH}\)).
Identify the functional groups listed in the problem: Aldehyde group (\(\text{-CHO}\)), Hydroxyl group (\(\text{-OH}\)), Ketone group (\(\text{C=O}\)), and Carboxyl group (\(\text{-COOH}\)).
Recall that the carboxyl group (\(\text{-COOH}\)) is a defining feature of amino acids, as it is present in all amino acids along with the amino group.
Compare the functional groups: The aldehyde, hydroxyl, and ketone groups are not present in all amino acids, whereas the carboxyl group is universally present.
Conclude that the carboxyl group is the correct answer, as it is the functional group present in all amino acids.
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