Multiple Choice
Which functional group can always be found in a carbohydrate molecule?
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1. Introduction to Biochemistry
Functional Groups
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Which of the following functional groups is present in all amino acids?
A
Aldehyde group (\(-CHO\))
B
Phosphate group (\(-PO_4^{2-}\))
C
Amino group (\(-NH_2\))
D
Sulfhydryl group (\(-SH\))
Verified step by step guidance1
Step 1: Understand the structure of amino acids. Amino acids are the building blocks of proteins and have a general structure consisting of a central carbon atom (called the alpha carbon) bonded to four groups: an amino group (
), a carboxyl group (
), a hydrogen atom, and a variable side chain (R group).
Step 2: Analyze the functional groups listed in the problem. The aldehyde group (
), phosphate group (
), and sulfhydryl group (
) are not universally present in all amino acids.
Step 3: Identify the functional group that is common to all amino acids. The amino group (
) is a defining feature of amino acids and is present in every amino acid structure.
Step 4: Recall that the amino group (
) is responsible for the 'amino' part of the name 'amino acid,' while the carboxyl group (
) contributes the 'acid' part.
Step 5: Conclude that the correct answer is the amino group (
), as it is universally present in all amino acids and is essential to their structure.
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