Methionine, serine, tyrosine and glycine are different amino acids found in proteins of living cells. What distinguishes these amino acids?
A
Location of their -COOH group
B
Location of their 
group
group C
The composition of their side chain' or R-group
D
Location of -H graph
Text Solution
Verified by ExpertsThe correct answer is:
C
All standard 
-amino acids have the same amino ( 
) and carboxyl 
groups attached to the 
carbon. What makes each amino acid different is its R-group, which determines properties like size, charge, polarity, and hydrophobicity (e.g., glycine 
, serine 
, tyrosine 
phenolic ring).
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