Movement Of Molecules Across Cell Membrane Flashcards Preview

Biology- Semester 1 > Movement Of Molecules Across Cell Membrane > Flashcards

Flashcards in Movement Of Molecules Across Cell Membrane Deck (9):
0

Concentration gradient

The difference of concentration of a substance in different locations.

1

Diffusion

The movement of molecules from an area of high concentration to an area on low concentration. Requires NO energy.(like a slide)

2

Osmosis

Diffusion of WATER through a selectively permeable membrane(a membrane that only allows some materials to pass through it). Moves from an area of high concentration to an area of low concentration. NO energy required(again like a slide). *Focus on where the water goes*

3

Isotonic

2 solutions of the same strength (amount) Think of this like goldilocks. Just the right amount of solute(what gets dissolved. Like sugar in sugar water)and solvent(what does the dissolving. Like the water in sugar water).

4

Hypertonic

High concentration, above strength(amount). (Too much solute)

5

Hypotonic

Too low concentration, below strength(amount).

6

Active transport

When molecules move across an area of low concentration to an area of high concentration. Requires energy(like climbing a slide). Needs a facilitator(transport proteins) to move the molecules.

7

Molarity

Moles per Liter of solution. The equation is moles of solute/volume of solution. To find moles of solute find molar mass of the chemical, for example O2 is 16 grams. Then you multiply this by 2 and get 32 grams, the molar mass of O2.

8

Facilitated Diffusion

Requires protein channel for molecules to cross the cell membrane. NO energy is required.