Cell Membrane Revision PT1

What is the primary function of the cell membrane?

• To produce energy for the cell

• To regulate the movement of materials in and out of the cell

• To synthesize proteins

• To store genetic information

Which of the following molecules is hydrophobic and found embedded in the lipid bilayer of the cell membrane?

• Phospholipids

• Cholesterol

• Glycoproteins

• Carbohydrate chains

What is the term used to describe the movement of water molecules across a selectively permeable membrane?

• Diffusion

• Osmosis

• Active transport

• Endocytosis

Which of the following is NOT a type of membrane protein?

• Integral proteins

• Peripheral proteins

• Glycocalyx

• Lipid-bound proteins

What is the main function of glycoproteins in the cell membrane?

• To transport ions across the membrane

• To provide cell-cell recognition and protection

• To synthesize ATP

• To store genetic information

Which of the following best describes the Fluid Mosaic Model of the cell membrane?

• The membrane is rigid and immobile, with proteins fixed in place

• The membrane is fluid, with molecules that can move within their layers, and proteins are scattered like a mosaic

• The membrane is composed entirely of carbohydrates and lipids

• The membrane is impermeable to all substances

How does cholesterol affect the cell membrane?

• It makes the membrane more rigid and less flexible

• It increases the permeability of the membrane to hydrophilic substances

• It maintains fluidity and flexibility by preventing the hydrophobic tails from solidifying

• It breaks down the lipid bilayer

What is the role of carrier proteins in the cell membrane?

• They provide channels for ions to pass through

• They bind to specific substrates and change shape to transport them across the membrane

• They act as receptors for hormones and neurotransmitters

• They provide structural support to the membrane

In osmosis, water molecules move from:

• A region of low water potential to a region of high water potential

• A region of high water potential to a region of low water potential

• A region of high solute concentration to a region of low solute concentration

• A region of low solute concentration to a region of high solute concentration

What happens to a cell placed in a hypertonic solution?

• The cell will swell and may burst

• The cell will shrink due to water loss

• The cell will remain unchanged

• The cell will gain water and become turgid