Question

passive transport occurs when molecules cross the cell membrane without using cellular energy. molecules cross the cell membrane by three main types of passive transport: simple diffusion, facilitated diffusion, and osmosis. select the true statements. as molecules move randomly, they collide with each other and spread out down their concentration gradients. simple diffusion is a type of passive transport, while facilitated diffusion is a type of active transport. cellular energy is not required to move molecules from areas of higher concentration to areas of lower concentration. large, nonpolar molecules are able to cross the cell membrane by osmosis.

Explanation:

1. Molecules spread down gradients via random motion.
2. Both simple and facilitated diffusion are passive.
3. Passive transport doesn't need cellular energy.
4. Osmosis is for water, not large non - polar.

Answer:

As molecules move randomly, they collide with each other and spread out down their concentration gradients.
Cellular energy is not required to move molecules from areas of higher concentration to areas of lower concentration.