Proteins are found to have two different types of secondary structures via $\mathrm{\alpha }$-helix and $\mathrm{\beta }$-pleated sheet structure. The $\mathrm{\alpha }$-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:

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: 

Given below are two statements: 

Given below are two statements: