Transport in cells

Diffusion is the movement of particles from

• an area of equilibrium to an area of high concentration.

• an area of low concentration to an area of high concentration.

• an area of high concentration to an area of low concentration.

• all of the answers describe what occurs in diffusion.

Osmosis is the movement of ________ across a semi-permeable membrane.

• food

• energy (ATP)

• oxygen

• water

A high/steep concentration gradient means

• diffusion will occur at a decreased rate

• diffusion will occur at an increased rate

• diffusion will occur at a constant rate

• concentration gradient does not affect the rate of diffusion

Which is true about active transport?

• Substances move from a high to low concentration

• Substances move down the concentration gradient

• Energy is required

• No energy is required

Which is an example of osmosis?

• water moving into the root cells of a plant

• carbon dioxide moving into the leaf of a plant cell

• oxygen moving into the bloodstream from the lungs

• potassium ions moving in and out of an animal cell

When red blood cells are placed in distilled water, the cells swell as water molecules enter them. By what process do water molecules move into the cells?

• Diffusion

• Active Transport

• Osmosis

This cell organelle helps organisms maintain homeostasis by controlling what substances enter and leave the cell.

• cell membrane

• nucleus

• vacuole

• cell wall

In a nerve cell, ATP energy is used to pump sodium (Na) out of the cell and potassium (K) into the cell. This is an example of...

• Diffusion

• Active Transport

• Osmosis

When the concentration of particles inside of a cell is the same as the concentration of particles outside of the cell.

• concentration gradient

• equilibrium

• passive transport

• active transport

A cell moves particles using energy against the concentration gradient by

• active transport

• passive transport

• diffusion

• osmosis