Membrane Proteins Quiz

What percentage of human proteins are membrane proteins?

• Two-thirds

• One-fourth

• One-third

• One-half

Which type of membrane protein is permanently part of the membrane?

• Integral

• Peripheral

• Extrinsic

• Lipid-anchored

Which type of protein modification involves the addition of fatty acids?

• Lipidation

• Phosphorylation

• Acetylation

• Glycosylation

What is the main reason phospholipids form bilayers in water?

• Covalent bonding

• Electrostatic interactions

• Hydrophobic effect

• Ionic bonding

What is the main characteristic of amphipathic molecules?

• Both hydrophilic and hydrophobic

• Neither hydrophilic nor hydrophobic

• Only hydrophilic

• Only hydrophobic

Which type of transmembrane protein is found only in the outer membranes of certain organelles?

• Helix bundle

• Beta-barrel

• Alpha helical

• Lipid-anchored

What is the primary function of transmembrane proteins in transport?

• Energy storage

• Facilitating substance passage

• Protein synthesis

• Cell division

What is the role of a hydropathy plot in studying transmembrane proteins?

• Identifying protein function

• Measuring protein activity

• Determining protein mass

• Predicting protein structure

What is the function of glycosylation in transmembrane proteins?

• Energy production

• Signal transduction

• Cell surface protection

• Protein synthesis

What is the significance of the cell coat formed by carbohydrates?

• Cell recognition

• Protein synthesis

• Signal transduction

• Energy production