Cell Membrane and Cell Transport

What is diffusion?

• particles (like oxygen or sugar) move from high concentration to low concentration

• particles move randomly in all directions regardless of concentration

• particles are forced from low concentration to high concentration

• particles remain stationary in a fixed position

What is osmosis?

• The process of water moving across a membrane from an area of high water concentration to low water concentration

• The movement of solutes from an area of low concentration to high concentration

• The diffusion of gases across a membrane

• The absorption of nutrients by cells from the bloodstream

Why do scientists say cell membranes are "selectively permeable"?

• a cell membrane allows only certain molecules to pass through its spaces

• a cell membrane allows all molecules to pass freely

• a cell membrane prevents any molecules from entering

• a cell membrane only allows large molecules to pass through

What is passive transport?

• processes that allow molecules to move into or out of a cell through membrane openings, without using energy

• the active movement of molecules against their concentration gradient using energy

• the process of engulfing large particles into the cell

• the movement of water across a selectively permeable membrane

When you place a gummy bear in plain water, water moves into the gummy bear through its surface. The gummy bear swells up. Is this osmosis or diffusion?

• Osmosis

• Diffusion

• Evaporation

• Filtration

Which direction does water move during osmosis?

• from a region of lower water concentration to one of higher concentration.

• from a region of higher water concentration to one of lower concentration.

• in a random direction without a specific pattern.

• only when there is an external force applied.

What is the role of the cell membrane?

• regulate the movement of substances in and out of the cell

• provide structural support to the cell

• store genetic information

• produce energy for the cell

When students move from a crowded classroom to an empty hallway. Is this an example of osmosis or diffusion?

• Osmosis

• Diffusion

• Evaporation

• Condensation

When someone sprays perfume in one corner of a room, the scent starts out strong there. The perfume smell spread through the air until the scent is evenly distributed. Is this an example of osmosis or diffusion?

• Osmosis

• Diffusion

• Evaporation

• Condensation

What is equilibrium?

• when the particles are evenly distributed, and there's no overall movement in any direction

• when particles are constantly moving in one direction

• when there is a high concentration of particles in one area

• when particles are randomly distributed with no pattern