Transport Across Cell Membrane

Question 1

Facilitated Diffusion

Answer 1

Molecules too large to move through cell membrane through diffusion, pass through facilities diffusion, using carrier proteins.
Molecule binds to carrier protein, changes shape and moves molecule to opposite side of the membrane
Eg. glucose and amino acids

Question 2

Osmosis

Answer 2

Passive process which is the diffusion of water across a differentials permeable membrane.
Water moves in and out until homeostasis is achieved
Osmotic pressures

Question 3

Active Transport

Answer 3

Active process which transports molecules across a membrane against the concentration gradient.
Molecules can be secreted/absorbed no matter concentration

Question 4

Vesicular Transport

Answer 4

Active process in which material moves in/out cells enclosed in vesicles

Question 5

Exocytosis Vesicular Transport

Answer 5

Contents of a vesicle are pushed out through cell membrane.

Membrane around vesicle fuses to with cell membrane and contents of vesicle are pushed to exterior.

Question 6

Endocytosis Vesicular Transport

Answer 6

Cell surrounds extra cellular material with a fold of cell membrane, and the enfolding cell membrane then breaks away and material is enclosed in cell
Phagocytosis- solid material engulfed
Pinocytosis- Liquid material engulfed

Question 7

Concentration gradient

Answer 7

The difference in the number of molecules in an area

Greater the concentration gradient, faster the movement

Question 8

Diffusion

Answer 8

Passive process which molecules spread out across an area. Evenly distributed and uses a concentration gradient.