BIO A-CLASS QUIZ - F4 3.1PLASMA MEMBRANE

What is the primary structure of the plasma membrane?

• Cholesterol layer

• Protein layer

• Phospholipid bilayer

• Carbohydrate chain

Who proposed the fluid mosaic model of the plasma membrane?

• A. Einstein

• J. Watson

• S.J. Singer and G.L. Nicholson

• C. Darwin

What is one function of the plasma membrane?

• Produce hormones

• Store genetic information

• Control the movement of substances in and out of the cell

• Generate energy

What type of proteins are involved in transporting substances across the plasma membrane?

• Structural proteins

• Channel and carrier proteins

• Enzymatic proteins

• Receptor proteins

What does the hydrophilic head of a phospholipid do?

• Attracts water

• Repels water

• Forms a barrier

• Stores energy

Which of the following is NOT a component of the plasma membrane?

• Cholesterol

• Phospholipid

• Glycoprotein

• Nucleic acid

What is the role of cholesterol in the plasma membrane?

• Makes it more rigid

• Increases permeability

• Makes it stronger and more flexible

• Acts as a receptor

What is meant by selective permeability?

• Allows all substances to pass

• Allows only water to pass

• Prevents all movement

• Only allows certain molecules to pass

What is one necessity of movement of substances across a plasma membrane?

• To decrease oxygen supply

• To increase waste products

• To eliminate nutrients

• To regulate solute concentration

What type of membrane allows free movement of many solvents?

• Selective permeable membrane

• Non-permeable membrane

• Permeable membrane

• Impermeable membrane