Biomolecules Test - 8

When the polypeptide chains run parallel and are held together by hydrogen and disulphide bonds, then fibre– like structure is formed. Such proteins called fibrous proteins are generally insoluble in water. A common example is keratin (present in hair, wool, silk).

DNA fingerprinting is now used

1. in forensic laboratories for identification of criminals.
2. to determine paternity of an individual.
3. to identify the dead bodies in any accident by comparing the DNA’s of parents or children.
4. to identify racial groups to rewrite biological evolution.

Globular proteins are formed when the chains of polypeptides coil around to give a spherical shape. These are usually soluble in water. For example albumin and insulin.

Globular proteins are formed when the chains of polypeptides coil around to give a spherical shape. These are usually soluble in water. When the polypeptide chains run parallel and are held together by hydrogen and disulphide bonds, then fibre– like structure is formed. Such proteins called fibrous proteins are generally insoluble in water. Myosin (present in muscles), is a fibrous protein and not a globular protein.

Amino acids contain amino (–NH₂) and carboxyl (–COOH) functional groups.

B group vitamins and vitamin C are soluble in water so they are grouped together as water soluble vitamins, these must be supplied regularly in diet because they are readily excreted in urine and cannot be stored (except vitamin B₁₂) in our body.

B group vitamins and vitamin C are soluble in water so they are grouped together as water soluble vitamins. These must be supplied regularly in diet because they are readily excreted in urine and cannot be stored (except vitamin B₁₂) in our body.

Vitamins which are soluble in fat and oils but insoluble in water are kept in fat soluble vitamins. These are vitamins A, D, E and K. They are stored in liver and adipose (fat storing)  tissues. All these are insoluble in water.

Vitamins which are soluble in fat and oils but insoluble in water are kept in fat soluble vitamins. These are vitamins A, D, E and K. These are generally stored in liver and adipose (fat storing) tissues.