Amino Acids

Q.

Which of the following is not an aromatic amino acid?

1. Tyrosine

2. Phenylalanine

3. Tryptophan

4. Glycine

Q.

Which of these statement is NOT true about amino acids?

1. They contain separate parts with a positive and negative charges

2. They become zwitter-ionic when dissolved in water

3. They can be a zwitter-ion even in solid state

4. There is no internal transfer of charge in amino acids

Q. All statements about amino acids are true except

1. they are also called substituted methanes
2. alanine is the simplest amino acid
3. they can be basic, acidic or neutral in nature
4. condensation of alpha-amino acids form proteins

Q.

Based on the functional nature of carbon, an amino acid has a central carbon atom with 4 units called __

1. carboxyl group, amine group, R group and H atom.

2. sugar group, carboxyl group, sulfur group and H atom.

3. lipid group, amine group, R group and H atom.

4. nitrogen group, carbon group, sulfur group and H atom.

Q. Amino acids have substituent groups occupying the four valency positions of the central carbon atom. The substituents are

1. two carboxyl groups, two amino groups
2. hydrogen, carboxyl group, amino group and a variable R group
3. hydrogen, carboxyl group, amino group
4. two hydrogen, carboxyl group and amino group

Q. Which of the following statements are true
A. Water solubility of an amino acid is maximum at a pH when concentrations of anions and cations are equal.
B. Amino acids can be detected by ninhydrin test
C. On reacting with nitrous acid amino acids release $N_2$

1. All
2. B and C
3. A and B
4. only A

Q. Which one is imino acid?

1. Pepsin
2. Proline
3. Cysteine
4. Renin

Q.

Which of these groups vary from amino acid to another?

1. Amino group

2. Carboxylic group

3. R group

4. Alpha carbon