Science: Lesson 3
If the concentration of water in the air surrounding a plant is less than the concentration of water inside the plants vacuoles, water will diffuse into the _______ until the concentrations of water are equal.
Air
_____________ proteins allow ions to pass through the cell membrane.
Channel
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 cells ___________ to move substances through a cell membrane.
Energy
Passive transport is the movement of substances through a cell membrane without using the cells ____________.
Energy
A cells vesicles release their contents outside the cell during _____________
Exocytosis
As a cell ___________, it's 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 and lower
Carrier proteins carry ___________________ through the cell membrane.
Large molecules
Active transport moves substances from areas of __________ concentration to areas of ___________ concentration.
Lower and higher
A cell membrane is ______________, which means that it allows only certain substances to enter or leave a cell.
Semipermeable
Facilitated diffusion allows molecules to pass through a cell membrane using _____________ proteins.
Transport
For a cell to survive, it's surface area must be large compared to its _____________
Volume
Osmosis is the diffusion of __________ molecules only through a membrane.
Water