Diffusion & Cell Membrane

How do molecules move during diffusion?

• From high concentration to low concentration

• From low concentration to high concentration

Which type of diffusion uses a protein to help molecules get across?

• Simple diffusion

• Facilitated diffusion

Phospholipids have a -

• nonpolar head and a nonpolar tail.

• polar head and a polar tail.

• nonpolar head and a polar tail.

• polar head and a nonpolar tail.

Tags

NGSS.MS-PS1-1

The process by which living things try to keep their internal conditions relatively stable (or balanced) is called - 

• homeostasis.

• metabolism

• osmosis.

• diffusion.

The _______ regulates what enters and leaves a cell.  

• cell Membrane

• nucleus

• cell wall

• cytoplasm

Tags

NGSS.MS-LS1-2

What is equilibrium?

• a large  amount of substance on  side of the cell and a small amount on the other side
• a small  amount of substance on  side of the cell and a large amount on the otherside
• equal amount of substance on either side of the membrane  
• no particles on either side of the a cell membrane

Passive Transport is the movement of particles across the membrane from an area of [ ___ ] concentration to an area of [ ___ ] concentration.

• high to low

• low to high

• low to low

• high to high

An example of facilitated diffusion is

• CO₂ and O₂ exchange in the lungs

• Glucose transport

• Na⁺ / K⁺ Pumps

What does facilitated diffusion use to get particles from one side of the membrane to the other?

• a membrane-spanning protein

• a surface protein

• a phospholipid

• a carbohydrate

What is the gradual change in the amount of solutes in a solution over time?

• concentration gradient

• concentration

• [high] --> [low]