MCQs on Plasma Membrane

The plasma membrane is primarily composed of:

• Proteins and carbohydrates

• Lipids and proteins

• DNA and proteins

• Nucleotides and carbohydrates

The lipid bilayer of the plasma membrane is formed by:

• Cholesterol molecules

• Phospholipids

• Glycolipids

• Proteins

Which part of a phospholipid is hydrophilic?

• Fatty acid tail

• Glycerol backbone

• Phosphate head

• Entire molecule

What is the role of cholesterol in the plasma membrane?

• Provides energy

• Increases fluidity and stability

• Forms a channel for ion transport

• Produces ATP

The plasma membrane is selectively permeable, meaning it:

• Allows all substances to pass through

• Blocks all substances from passing through

• Regulates the movement of substances into and out of the cell

• Is impermeable to water

The primary function of membrane proteins is to:

• Store genetic material

• Transport molecules and act as receptors

• Produce energy

• Break down waste

Which of the following is a function of glycoproteins in the plasma membrane?

• Structural support

• Cell recognition and signaling

• Transport of ions

• Lipid synthesis

Diffusion across the plasma membrane requires:

• Energy from ATP

• Membrane proteins but no energy

• Endocytosis

• None of these

Which type of transport requires energy?

• Simple diffusion

• Facilitated diffusion

• Active transport

• Osmosis

Endocytosis is a process where the plasma membrane:

• Pumps ions across the membrane

• Engulfs substances into vesicles

• Expels waste materials

• Transports oxygen directly