Exercise: Amino Acids

Amino acid is a compound that consists of at least one group of

• amino and one amide group

• hydroxyl and one amine group

• amino and one hydroxyl group

• amino and one carboxyl group

The general structural formula of an amino acid is

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Amino acids all have the same general structure except for the:

• Amino Group
• Carboxyl Group
• 'R' Group
• Carbonyl Group

Amino acid having both positive and negative charge is called.....

Which of the following statement is true about aminoethanoic acid?

• It exhibits optical isomerism.

• It exists in the anionic form in acidic solution.

• It forms zwitterions in aqueous solution

• It is soluble in non-polar solvents.

What species is produced when 2-aminopropanoic acid (pI = 6) is dissolved in a solution with pH = 2?

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Identify the peptide bond for the following polypeptide.

• A

• B

• C

• D

Consider the following amino acid:

Which of the following statement(s) is(are) true about the amino acid?

• It is in anionic form in neutral solution

• It is in cationic form in acidic solution.

• It exists in zwitterionic form in solution with pH 9.74

Bacteria requires p-aminobenzoic acid (PABA) in order to biosynthesise folic acid, an essential growth factor. PABA

• exists as a pair of optical isomers

• reacts with aqueous NaOH to form a salt

• reacts with hydrochloric acid to form a salt