Chapter 2.3: Cell Transport

Question 1

Semipermeable

Answer 1

Allows certain ions and molecules to pass through but restrict the movement of others.

Question 2

Passive vs Active

Answer 2

Passive: does not use energy
Active: uses the cell’s energy in the form of adenosine triphosphate (ATP)

Question 3

Simple diffusion

Answer 3

Movement of a substance from a higher concentration to a lower concentration of that substance.
* Small and/or non-polar molecules can move directly across the membrane e.g., O2, CO2.
* Passive

Question 4

Concentration gradient

Question 5

Facilitated diffusion

Answer 5

• Large and/or polar molecules need to pass through channel proteins, e.g., water, or carrier-mediated proteins e.g., glucose.
• Protein channels provide a pathway for hydrophilic particles
• Passive

Question 6

Osmosis

Answer 6

• Movement of a solvent (water - universal solvent) across a selectively permeable membrane from an area of lower concentration of solute (ions) to an area of higher concentration of solute.
  From higher concentration of water to lower
• Passive