Define simple protein, conjugated protein and the globular protein

• Simple protein refers to protein that consists of only amino acids and does not contain any other substances. Example: collagen.
• Conjugated protein is a protein that contains non-protein materials called prosthetic groups. Example: haemoglobin.
• The globular protein is a polypeptide chain with tertiary or quaternary structures.  It is tightly coiled and folded into a spherical shape. Examples: enzymes, antibodies and some hormones.