Structure And Function Of Plasma Membrane

Question 1

The function of the cell membrane is…

Answer 1

The boundary that separates the living cell from the non-living surroundings

Question 2

The plasma membrane controls…

Answer 2

Which substances pass in and out of the cell
Uptake of nutrients
Secreting enzymes and glycoproteins
Cell recognition

Question 3

Fluid mosaic model meaning

Answer 3

Fluid- phospholipids can drift, not locked in place

Mosaic- proteins, cholesterol and carbohydrates are embedded into the membrane

Question 4

Protein that are on the surface of bilayer to provide structural support

Answer 4

Extrinsic

Question 5

Proteins that go through the bilayer to act as channels and carries and pumps

Answer 5

Integral

Question 6

Cholesterol function

Answer 6

Increases rigidity and stability

Question 7

Glycolipid function

Answer 7

Found on outer layer and involved in cell recognition

Question 8

What molecules can freely pass via simple diffusion?

Answer 8

Small, non-polar molecules

Lipid soluble

Question 9

What do large, charged molecules require to pass?

Answer 9

Integral proteins for facilitated diffusion and active transport

Question 10

Movement of molecules/ions from a region of high conc to a region of low conc until equally distributed?

ATP?

Answer 10

Diffusion

NO

Question 11

What does facilitated diffusion require?

Answer 11

Carrier protein that rotates and changed shape to drop molecule on other side
Concentration gradient

Question 12

The movement of molecules of H2O from a region of high water potential to a region of low water potential via a semi-permeable membrane.

Answer 12

Osmosis

Question 13

Lower water potential inside the cell so H2O moves out

Answer 13

HYPERTONIC

Question 14

Same water potential so no net movement

Answer 14

ISOTONIC

Question 15

Higher water potential outside the cell so H2O moves in

Answer 15

HYPOTONIC

Question 16

ATP is required when molecules are moved….

Answer 16

Against a concentration gradient

Question 17

Active transport requires a specific

Answer 17

Intristic protein pump

Question 18

Uses a gradient generated by primary active transport to enhance the movement of a second substance?

Answer 18

Secondary active transport

Question 19

Uniporter

Answer 19

One channel

Question 20

Symporter

Answer 20

Two channels, same direction

Question 21

Antiporter

Answer 21

Two channels, opposite directions

Question 22

Cell engulfs debris, bacteria or other sizzle objects within specialised cells

Answer 22

Phagocytosis

Question 23

Cell engulfs extracellular fluid and enters cell via a vesicles but does not mix with the cytoplasm

Answer 23

Pincytosis

Question 24

Allows cells to take up specific macromolecules called ligands. Requires specific membrane receptors

Answer 24

Receptor-mediated endocytosis

Question 25

Release of material from the call by changing the cell membrane.

Answer 25

Exocytosis