Multiple Choice
Which of the following amino acids contains a positively charged (basic) side chain at physiological pH?
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3. Amino Acids
Amino Acid Groups
Multiple Choice
In the general structure of an amino acid, which component varies among different amino acids and makes each one unique?
A
The side chain (R group) attached to the carbon
B
The carboxyl group ()
C
The hydrogen atom attached to the carbon
D
The amino group (-)
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 different groups: an amino group (\(NH_2\)), a carboxyl group (\(COOH\)), a hydrogen atom (\(H\)), and a variable side chain (R group).
Understand that the amino group (\(NH_2\)), carboxyl group (\(COOH\)), and hydrogen atom (\(H\)) are common to all amino acids and do not vary between them.
Identify that the side chain, often represented as the R group, is the component attached to the \(C_{\alpha}\) carbon that differs among amino acids.
Recognize that this variation in the side chain (R group) is what gives each amino acid its unique chemical properties and identity.
Conclude that the side chain (R group) attached to the \(C_{\alpha}\) carbon is the component that varies among different amino acids and makes each one unique.
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