Transport Processes Across Cell Membrane

Which of the following are the three transport processes that living organisms use for exchange across the cell membrane?

• Diffusion, filtration, and active transport

• Diffusion, osmosis, and active transport

• Osmosis, active transport, and endocytosis

• Diffusion, osmosis, and passive transport

What is diffusion?

• The process by which particles are heated in a solution

• The movement of particles from an area of lower concentration to an area of higher concentration

• The spreading out of particles of any substance in solution, or particles of a gas, resulting in a net movement from an area of higher concentration to an area of lower concentration

• The active transport of particles against a concentration gradient

Which of the following statements is true about the nature of particles in a solution or gas in relation to diffusion?

• Particles in a solution or a gas are stationary and do not move

• Particles move from regions of lower concentration to regions of higher concentration

• Particles in a solution or a gas are always moving about randomly

• Particles only move when an external force is applied

What tends to happen if there are more particles in one area compared to another?

• Particles remain static until energy is added to the system

• There is no net movement of particles between the regions

• There is a net movement of particles from the region of lower concentration to the region of higher concentration

• There is a net movement of particles from this region of higher concentration to a region where there are fewer particles

How does temperature affect the rate of diffusion?

• Lower temperatures increase the rate of diffusion due to decreased kinetic energy

• Temperature has no effect on the rate of diffusion

• Higher temperatures decrease the rate of diffusion due to increased kinetic energy

• Higher temperatures increase the rate of diffusion due to increased kinetic energy

Which of the following is one of the simplest examples of diffusion?

• Sugar dissolving in water

• Perfume particles spreading through the air until evenly spread

• Water evaporating into the atmosphere

• A balloon inflating when air is pumped into it

What is the primary function of the cell membrane in living organisms?

• To produce energy for the cell

• To separate the inside of the cell from its outside environment

• To synthesize proteins

• To store genetic information

Which of the following substances is able to diffuse across the cell membrane during gas exchange?

• Starch

• Proteins

• Oxygen

• DNA

Why is the cell membrane described as being 'partially permeable'?

• Because it allows all substances to enter or leave the cell

• Because it does not allow any substances to enter or leave the cell

• Because it allows only certain substances to enter or leave the cell while others cannot

• Because it is fully permeable to gases only

Which statement correctly describes the diagram shown?

• Glucose is unable to cross the cell membrane, while starch can.

• A higher concentration of glucose is shown inside the cell than outside in the extracellular fluid.

• The lipid bilayer allows starch to pass through but not glucose.

• Glucose can cross the cell membrane from a higher to a lower concentration.