Lecture 2: Classification of Amino acids

Question 1

Classification of AA

Nonpolar Aliphatic amino acids?

Answer 1

• R groups groups are hydrophobic
• found in the interior of the protein.

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Question 2

Polar Uncharged

Answer 2

• more soluble in water
• contain functional groups that can from H bonds with water

Alcohols and Amid amino acids and sulphur containing amino acids

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Question 3

Classification of AA

Aromatic amino acids?

Answer 3

• R groups have benzene ring
• R groups are hydrophopic hence are located on the interior of a protein.
• can absorb UV light of wavelenght 250–290 nm

3

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Question 4

Classification of AA

basic amino acids/positively charged amino acids?

Answer 4

• are hydrophillic (water loving)
• consists of an extra amino group in their side chains which can ionize
• pKa value of R group of histidine is 6 which is near 7 and therefore plays a role in maintaining the physiological pH.

basic amino acids

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Question 5

classification of AA

amide amino acids

Answer 5

• are polar uncharged
• side chains can form H bonding

2

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Question 6

classification of AA

Acidic amino acids/ negatively charged

Answer 6

• are polar and negatively charged
• have an extra carboxylic group in the R group which ionizes
• are the most hydrophillic when together with positively charged AA

acidic amino acids

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Question 7

Essential and nonessential?

Answer 7

essential cannot be synthesized by the body and must be supplimented in diet