Biology Test

Question	Answer
The cell membrane allows which tiny molecules to move freely through it.	Water, oxygen and carbon dioxide.
Starch is a ... and is ... to pass through.	Starch is a large molecule and is unable to pass through.
The cell membrane is said to be...	...selectively permeable.
Diffusion is a ..., it ... require energy.	Diffusion is a passive process, it does not require energy.
What is the definition of diffusion?	Diffusion is the movement of molecules from a region of high concentration to low concentration. in living cells this would take place across a selectively permeable membrane until the concentrations are equal.
In diffusion, molecules always move along a concentration gradient from ... to ... concentration.	In diffusion, molecules always move along a concentration gradient from high to low concentration.
Diffusion is the means by which useful substances such as ..., enter a cell and waste materials such as ..., leave a cell.	Diffusion is the means by which useful substances such as oxygen, enter a cell and waste materials such as carbon dioxide, leave a cell.

Resource summary

	Created by Grace Daniels over 8 years ago