Understanding Cell Membranes Quiz

What is the primary component of cell membranes?

• Proteins

• Carbohydrates

• Lipids

• Nucleic acids

Which model describes the structure of the cell membrane?

• Solid mosaic model

• Fluid mosaic model

• Rigid layer model

• Dynamic equilibrium model

What is the main function of cell membranes?

• To provide structural support to the cell

• To control the movement of substances into and out of the cell

• To facilitate cell division

• To synthesize proteins

What does selective permeability mean?

• The membrane allows all substances to pass through.

• The membrane does not allow any substances to pass through.

• The membrane allows only certain substances to pass through.

• The membrane changes its permeability based on the cell's needs.

Which processes do NOT require energy to transport substances across cell membranes?

• Active transport

• Osmosis

• Exocytosis

• Facilitated diffusion

What role do proteins play in the cell membrane?

• Provide energy for the cell

• Act as channels and carriers for substances

• Make up the majority of the cell membrane structure

• Store genetic information

What is osmosis?

• The movement of ions from high to low concentration

• The active transport of molecules against the concentration gradient

• The movement of water across a semipermeable membrane from an area of low solute concentration to an area of high solute concentration

• The process by which cells engulf substances from their external environment

What is active transport?

• Movement of substances along the concentration gradient without energy

• Movement of water molecules through a semipermeable membrane

• Movement of substances against the concentration gradient with the use of energy

• The process of releasing substances outside the cell without energy

What is exocytosis?

• The process of taking in large molecules by the cell

• The release of substances from the cell into the extracellular space

• The movement of water molecules from high to low concentration

• The active transport of ions across the cell membrane

Which of the following is NOT a function of cell membrane proteins?

• Enzymatic activity

• Cell-cell recognition

• Energy storage

• Signal transduction