Cell Membrane Structure and Function

What is the primary component of cell membranes?

• Carbohydrates

• Phospholipids

• Proteins

• Nucleic Acids

What does the fluid mosaic model describe?

• Structure of cell membranes

• Function of ribosomes

• Function of enzymes

• Structure of DNA

Which part of the phospholipid is hydrophilic?

• Cholesterol

• Fatty acid tail

• Glycerol

• Phosphate group

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

• Enzymatic proteins

• Structural proteins

• Transport proteins

• Receptor proteins

What is the process called when water moves across a selectively permeable membrane?

• Active transport

• Diffusion

• Osmosis

• Facilitated diffusion

Which of the following is a characteristic of the fluid mosaic model?

• Membrane is impermeable

• Phospholipids can move laterally

• Proteins are fixed in place

• Membrane is rigid

What is the role of cholesterol in the cell membrane?

• Decreases fluidity

• Increases permeability

• Acts as a receptor

• Increases strength and flexibility

What type of transport requires energy?

• Osmosis

• Active transport

• Simple diffusion

• Facilitated diffusion

What is the main function of carrier proteins?

• To provide structural support

• To act as enzymes

• To facilitate cell recognition

• To transport specific molecules across the membrane

What happens to a cell in a hypertonic solution?

• It shrinks

• It swells

• It remains the same

• It bursts