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kykrilka [37]
3 years ago
6

The presence of what group differentiates most amino acids from each other?

Biology
1 answer:
Karolina [17]3 years ago
6 0
 <span>Amino acids are the basic structural unit of all proteins. A 'free' amino acid (a single amino acid) always has: 
an amino group -NH2, 
a carboxyl group -COOH 
a hydrogen -H 
a chemical group or side chain -"R". 
Since the amino acids (except glycine) have 4 different groups attached to the a-carbon, they are optically active stereoisomers (recall 23.101 Organic Chemistry) although only L-isomers are found in proteins. 
At a neutral pH, both the amino and the carboxyl groups are ionised, giving what is termed the zwitterionic</span>
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