Cell Transport

What process occurs when WATER diffuses across a membrane?

• endocytosis
• mitosis
• osmosis
• nuclear fission 

When particles move from areas of high concentration to areas less concentrated, this has taken place.

• diffusion
• mitosis
• endocytosis
• photosynthesis

Why is diffusion and osmosis important to cells?

• It allows them to take in materials without using energy.
• It allows them to reproduce.
• It allows them to absorb sunlight.
• It allows cells to use all energy.

What does selectively-permeable mean?

• The cell controls what passes in and out of the cell
• Nothing gets through
• The cell lets only large substances through

What is diffusion?

• when molecules move 
• when molecules move from a high concentration to a low.
• no movement 
• molecules move everywhere

During osmosis

• water moves from high to low concentration
• large or oddly shaped molecules move across a cell membrane
• water moves when energy is used
• proteins are built

Movement of particles from high to low concentration. 

• Passive Transport
• Active Transport

Osmosis is a form of ______________. 

• Passive Transport
• Active Transport

ATP is a form of energy.

• Passive Transport
• Active Transport

This cell organelle helps organisms maintain homeostasis by controlling what substances may enter or leave cells.

• vacuole
• nucleus
• cell membrane
• cell wall