Physical and Chemical Properties of Proteins

Which of the following proteins is an example of a fibrillar protein?

• Myosin

• Ribonuclease

• Insulin

• Pepsin

What is denaturation in proteins?

• Formation of aggregates

• Loss of biological activity

• Increase in solubility

• Change in color

Which property of proteins is influenced by pH?

• Molecular weight

• Taste

• Solubility

• Color

Which test can be used to identify proteins?

• Litmus test

• Benedict's test

• Biuret test

• Iodine test

What happens to proteins at their isoelectric point?

• They change color

• They become more soluble

• They lose their shape

• They precipitate from solution

Which amino acids are found on the surface of soluble globular proteins?

• Hydrophilic amino acids

• Hydrophobic amino acids

• Non-polar amino acids

• Charged amino acids

What is the result of the Biuret test?

• Yellow color development

• Red color development

• Green color development

• Blue color development

Which reaction involves the NH2 group of proteins?

• Formation of Schiff's bases

• Esterification

• Hydrolysis with HCl

• Salt formation with mineral acids

What is the effect of denaturation on proteins?

• Reduces molecular weight

• Causes loss of structure

• Enhances biological activity

• Increases solubility