Proteins are found to have two different types of secondary structures via -helix and -pleated sheet structure. The -helix structure of a protein is stabilized by-
1. Peptide bonds
2. Van der waals forces
3. Hydrogen bonds
4. Dipole-dipole interactions
Each polypeptide in a protein has amino acids linked with each other in a specific sequence. This sequence of amino acids is said to be:
1. Primary structure of proteins
2. Secondary structure of proteins
3. Tertiary structure of proteins
4. Quaternary structure of proteins
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)
Given below are two statements:
Assertion (A): | All naturally occurring α -amino acids except glycine are optically active. |
Reason (R): | Most naturally occurring amino acids have L-configuration. |
1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
3. | (A) is True but (R) is False. |
4. | (A) is False but (R) is True. |
Given below are two statements:
Assertion (A): | Glycine must be taken through diet. |
Reason (R): | It is an essential amino acid. |
1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
3. | (A) is True but (R) is False. |
4. | Both (A) and (R) are False. |
Given below are two statements:
Assertion (A): | In presence of an enzyme, the substrate molecule can be attacked by the reagent effectively. |
Reason (R): | Active sites of enzymes hold the substrate molecule in a suitable position. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are FALSE. |
3. | (A) is true but (R) is false. |
4. | (A) is false but (R) is true. |