WITH COMPLETE SOLUTIONS VERIFIED LATEST UPDATE
Functions of proteins (6 things)
1. Defence
2. Transport
3. Storage
4. Communication
5. Enzymes
6. Structure
How many amino acids are there?
20
Components of an amino acid
Amino group (-NH2)
Carboxyl group (-COOH)
R Group
Hydrogen
Carbon (called alpha carbon)
Two amino acid stereoisomers and which is used in proteins
D-amino acid
L-amino acid (used in proteins)
Alanine (3 letter code, 1 letter code, R group, R group classification)
,Ala
A
CH3
Nonpolar, aliphatic
Arginine (3 letter code, 1 letter code, R group, R group classification)
Arg
R
(CH2)3NHC(NH2)NH2+
Positively charged
Asparagine (3 letter code, 1 letter code, R group, R group classification)
Asn
N
CH2C(NH2)O
Polar, uncharged
, Aspartic acid (3 letter code, 1 letter code, R group, R group classification)
Asp
D
CH2COO-
Negatively charged
Cysteine (3 letter code, 1 letter code, R group, R group classification)
Cys
C
CH2SH
Polar, uncharged
Glutamic acid (3 letter code, 1 letter code, R group, R group classification)
Glu
E
(CH2)2COO-