Lesson Outline; Chapter 2; Lesson 3;

________ proteins allow ions to pass through the cell membrane.

Channel

If the concentration of water in the air surrounding a plant is less than the concentration of water inside the plant's vacuoles, water will diffuse into the _______ until the concentrations of water are equal.

air

Usually diffusion continues through a membrane until the ________________ of a substance is the same on both sides of the membrane.

concentration

A cell uses ________________ to take in a substance by surrounding it with the cell membrane

endocytosis

Active transport uses the cell's ____________ to move substances through a cell membrane

energy

Passive transport is the movement of substances through a cell membrane without using the cell's ___________________

energy

A cell's vesicles release their contents outside the cell during _____________.

exocytosis

As a cell ___________, its volume increases faster than its surface area

grows

Diffusion is the movement of substances from an area of ___________________ concentration to an area of _______________ concentration

higher; lower

Carrier proteins carry ____________ through the cell membrane.

large molecules

Active transport moves substances from areas of _____________ concentration to areas of ____________ concentration.

lower; higher

A cell membrane is ______________, which means that it allows only certain substances to enter or leave a cell.

semepermeable

Facilitated diffusion allows molecules to pass through a cell membrane using _______ proteins

transport

For a cell to survive, its surface area must be large compared to its ______________.

volume

Osmosis is the diffusion of ______________ molecules only through a membrane.

water