Osmosis, Diffusion, and Active Transport

Oxygen molecules move from the air sacs in the lungs across the cell membranes into the blood. Is this diffusion, osmosis or active transport?

• diffusion

• osmosis

• active transport

Solutes move against the concentration gradient

• Passive Transport

• Active Transport

Which of the following is a sample of active transport?

• movement of oxygen from alveoli into red blood cell

• movement of water across cell membrane

• plant root absorbing mineral ions from the soil

• uptake of water by the root hair of the plant

Which one is the definition of Diffusion ?

• movement of particles through the cell membrane from a region of lower concentration to a region of higher concentration using energy in the form of ATP.

• passage of water molecules from a region of their higher concentration to a region of their lower concentration through a partially permeable membrane

• net movement of molecule from a region of higher concentration to region of lower concentration. Molecule down a concentration gradient

• net movement of molecule from a region of lower concentration to region of higher concentration. Molecule down a concentration gradient

Tags

NGSS.HS-LS2-3

Where is there a low concentration of dye?

• at the bottom of cup

• in the color

• at the top of cup 

• no concenteraion gradient

What is diffusion?

• when molecules move 

• when molecules move from a high concentration to a low.

• no movement 

• molecules move everywhere

The cell membrane is semi-permable, which means what?

• certain things can pass through

• the concentration levels are different

• it is permanent

• things are stuck

• It drives a big truck

In passive transport, molecules move from an area of __________ concentration to an area of __________ concentraiton

• high, low

• low, high

• water, salt

• active, passive

Howdoes a substance (like potassium and sodium) go from a low concentration outside the cell into a high concentration cell?

• passive transport

• active transport

• osmosis

• diffusion

A student noticed that placing wilted lettuce in a bowl of cool water caused the lettuce to become more crisp and firm. What is the best explanation for his observation?

• Water moved into the lettuce cells by active transport.

• Water moved into the lettuce cells by osmosis.

• Salt moved into the lettuce cells by diffusion.

• Water moved out of the lettuce cells by osmosis.

Tags

NGSS.MS-LS1-5