Multiple Choice
Which of the following amino acids contains a sulfur atom in its side chain?
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3. Amino Acids
Amino Acid Groups
Multiple Choice
In proteins, each amino acid differs from another primarily in which structural component?
A
The side chain (R group) attached to the carbon
B
The carboxyl group, which changes between and
C
The amino group, which varies among amino acids as vs.
D
The backbone atoms , which are unique for each amino acid
Verified step by step guidance1
Recall the general structure of an amino acid, which consists of a central alpha carbon (\(C_{\alpha}\)) bonded to four groups: an amino group (\(-NH_2\)), a carboxyl group (\(-COOH\)), a hydrogen atom, and a variable side chain (R group).
Understand that the amino group (\(-NH_2\)) and carboxyl group (\(-COOH\)) are consistent functional groups present in all standard amino acids, contributing to the backbone structure of proteins.
Recognize that the backbone atoms, specifically the sequence \(N - C_{\alpha} - C\), form the repeating structure of the protein chain and are the same for all amino acids.
Identify that the side chain (R group) attached to the \(C_{\alpha}\) carbon is the component that varies among different amino acids, giving each amino acid its unique chemical properties and identity.
Conclude that the primary difference between amino acids lies in their side chains (R groups), which influence the amino acid's size, polarity, charge, and reactivity within proteins.
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