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What are the general possibilities for the chemical types of R groups available for proteins?

What are the general possibilities for the chemical types of R groups available for proteins?

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There are 20 natural amino acids found in the cells. Each amino acid contains an alpha amino group and an alpha carboxyl group. All amino acids vary in their R-group. R group can be as simple as H as in the case of Glycine or it can be as complex as indole ring as in the case of tryptophan.

Polar amino acids contain a polar R-group: Ex: Ser

Acidic amino acids contain -COOH group. Ex: Asp and Glu

Basic amino acids contain amino group. Ex: Lys

Non-polar amino acids contain a hydrophobic side chain. Ex: Val, Leu and Ile.

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