Quaternary Structure of Proteins CHEM 108

Two or more polypeptides attached together and work as one unit

• Primary

• Secondary

• Tertiary

• Quaternary

The difference between tertiary and quartenary structure is:

• Tertiary structure has double bond whereas quartenary structure does not have double bond

• Tertiary structure consists of one polypeptide chain whereas quartenary structure consists of more than one polypeptide chains

• Tertiary structure is fibrous whereas quartenary structure is globular

• Tertiary structure is water-soluble whereas quartenary structure is lipid soluble

Haemoglobin is a quartenary protein because;

• It has more than one peptide bonds

• Its shape is globular

• It consists of more than one polypeptide chains

• It has iron in each heme group

Two or more polypeptides attached together and work as one unit

• Primary

• Secondary

• Tertiary

• Quaternary

How many structures or stages are there in proteins?

• 1
• 2
• 3
• 4

• Primary Structure

• Secondary Structure

• Tertiary structure

• Quaternary Structure

Hemoglobin : carries ... throughout bloodstream

• O2

• CO2

• H2O

• CO

Haemoglobin is a quartenary protein because;

• It has more than one peptide bonds

• Its shape is globular

• It consists of more than one polypeptide chains

• It has iron in each heme group

Proteins that are roughly spherical

• globular proteins

• fibrous proteins

• enzymatic proteins

• storage proteins

• motor proteins

Choose the diagram that represents a quaternary protein structure?

• 
• 
• 
•