3.1 Types of Transport

Students are observing particles moving with the concentration gradient in a lab investigation. Which type of transport are they observing?

• using pumps to move things quickly

• passive transport

• osmosis

• endocytosis

This picture shows molecules of red dye that have moved. What is this type of movement called?

• Osmosis; the water molecules are moving from high concentration to low

• Diffusion; the dye molecules are moving from low to high concentration

• Diffusion; the dye molecules are moving from high to low concentration.

• Facilitated diffusion; because the molecules are moving through a protein channel.

The cell membrane is responsible for allowing molecules to diffuse into or out of the cell. What type of movement is diffusion?

• Passive transport

• Active transport

The cell membrane is responsible for allowing molecules to diffuse through a protein channel, from high concentration to low concentration. What type of transport is this?

• Passive Transport

• Active transport

The cell membrane needs to use energy to move molecules quickly out of the cell through a pump. What type of transport is this?

• Passive transport

• Active transport

Passive transport is when molecules move ________ the concentration gradient.

• against

• up

• down

• with

Active transport is when molecules move ________ the concentration gradient.

• against

• up

• down

• with

This picture is a representation of what type of transport?

• Osmosis because it is diffusing through a protein from an area of high concentration to low concentration.

• Facilitated diffusion because it is diffusing through a protein from an area of high concentration to low concentration.

• Facilitated diffusion because it is diffusing through a protein from an area of low concentration to high concentration.

• Simple diffusion because it is diffusing through a protein from an area of high concentration to low concentration.

This picture describes the movement of molecules across the cell membrane. Choose 2 answers that correctly describes the movement of the molecules.

• Molecules are moving up the concentration gradient.

• Molecules are moving from an area of low concentration to area of high concentration .

• Molecules are moving down the concentration gradient.

• Molecules are moving from an area of high concentration to area of low concentration.

Osmosis is the movement of _____ across a membrane.

• food
• energy
• oxygen
• water