Cell Transport Review

What is the definition of OSMOSIS?

• Diffusion of water through a selectively permeable membrane

• Molecular structure that surrounds the cell and controls what enters and leaves the cell

• Movement of molecules across the cell membrane against the concentration gradient

• Movement of molecules across the cell membrane from an area of high concentration to low concentration

What is the definition of ACTIVE TRANSPORT?

• Movement of molecules across the cell membrane against the concentration gradient

• Diffusion of water through a selectively permeable membrane

• Molecular structure that surrounds the cell and controls what enters and leaves the cell

• Movement of molecules across the cell membrane from an area of high concentration to low concentration

Identify the following structure

• Phospholipid

• Cell

• Cell membrane

• Protein

Why would the cell need energy to move molecules across the membrane?

• the molecule is going against the concentration gradient

• the molecule is to large to pass through the membrane

• the lipid membrane requires energy anytime something is moving across the membrane

In passive diffusion, substances always move...

• from an area of higher concentration to an area of lower concentration

• from an area with more of the molecules to an area with fewer of the molecules

• from an area of lower concentration to an area of higher concentration

• from an area with fewer of the molecules to an area with more of the molecules

What does “high concentration area” mean?

• Spread out
• Tightly packed together
• Uncrowded
• Spacious

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

• diffusion
• mitosis
• endocytosis
• photosynthesis

What process occurs when WATER diffuses across a membrane?

• endocytosis
• mitosis
• osmosis
• nuclear fission 

Which is a picture of a phospholipid bilayer?

• 
• 
• 

Which of the types of transport are passive?

• A only.

• A and B only.

• B and C only.

• C only.