define fibrous and globular protein with examples?

Fibrous Protein: 

• This has Little or no tertiary structure.

• These are Long parallel polypeptide chains.

• In these cross linkages are present at intervals forming long fibres or sheets.

• It is usually insoluble.

• Many have structural roles.

• E.g. keratin in hair and the outer layer of skin, collagen (a connective tissue).

Globular Protein: 

• This protein has complex tertiary and sometimes quaternary structures.

• It is Folded into spherical (globular) shapes.

• It is usually soluble as hydrophobic side chains in centre of structure.

• Roles in metabolic reactions.

• E.g. enzymes, haemoglobin in blood.