Cell Membrane MCQs

Which of the following is NOT a characteristic of the cell membrane?

• Very thin

• Elastic

• Semi-permeable

• Rigid

What percentage of the cell membrane is composed of lipids?

• 42%

• 55%

• 3%

• 70%

Which component of the cell membrane helps maintain its fluidity?

• Phospholipids

• Cholesterol

• Glycoproteins

• Carbohydrates

Phospholipids in the cell membrane are arranged into:

• A single layer

• A triple layer

• A lipid bilayer

• A protein layer

Which part of the phospholipid molecule is hydrophobic?

• Head

• Tail

• Both head and tail

• Neither head nor tail

The glycocalyx is formed of:

• Phospholipids and proteins

• Glycolipids and glycoproteins

• Carbohydrates and cholesterol

• Proteins and carbohydrates

Which of the following functions is NOT associated with glycocalyx?

• Cell-cell recognition

• Tight fixation of cells

• Regulation of ion channels

• Immune function

Integral proteins:

• Span the entire thickness of the membrane

• Are located on the inner or outer surfaces of the membrane

• Are not embedded in the membrane

• Constitute 30% of total membrane proteins

Peripheral proteins:

• Span the entire membrane

• Are embedded in the membrane

• Are found on the inner or outer surfaces

• Make up 70% of membrane proteins

Which type of protein serves as carriers or channels for substances across the membrane?

• Integral proteins

• Peripheral proteins

• Glycoproteins

• Glycolipids