Amino acids exhibit amphoteric behavior as:
1. They can act both as an acid and as a base.
2. They can act only as an acid but not as a base.
3. They can act only as a base but not an acid.
4. None of the above.
A linkage present in proteins and peptides is:
1. | 2. | ||
3. | 4. |
α-helix structure of proteins is stabilized by :
1. | H-bonds formed between the −SH and C=O group. |
2. | H-bonds formed between the −NH and C=O group. |
3. | Ionic bonds formed between the −SH and C=O group. |
4. | Ionic bonds formed between the −NH and C=O group. |
An insoluble biomolecule in water is-
1. | -keratin | 2. | Haemoglobin |
3. | Ribonuclease | 4. | Adenine |
The denaturation of proteins indicates:
1. | The primary structure of a protein is destroyed and the enzyme loses it's activity. |
2. | The primary structure of a protein is destroyed and the enzyme enhances it's activity. |
3. | The secondary and tertiary structures of a protein are destroyed and the enzyme loses it's activity. |
4. | The secondary and tertiary structures of a protein are destroyed and the enzyme enhances it's activity. |
One of the essential α-amino acids is:
1. | Lysine | 2. | Glycine |
3. | Serine | 4. | Proline |
1. | Aniline | 2. | Acetanilide |
3. | Benzoic acid | 4. | Glycine |
Examples of globular proteins are:
(a) | Insulin | (b) | Keratin |
(c) | Albumin | (d) | Myosin |
Choose the correct option :
1. (a) and (b)
2. (b) and (c)
3. (c) and (d)
4. (a) and (c)