2.3 Transport through Membranes Flashcards Preview

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Flashcards in 2.3 Transport through Membranes Deck (19):
1

What is osmosis?

Water moves from an area of high water potential to lower water potential down at the water potential gradient passively

2

What is facilitated diffusion?

A substance made from an area of high concentration to an area of low concentration down a concentration gradient passively through specialise channels and pores

3

What is a protein carrier

Are poor that opens in a protein
ATP energy is used and forms ADP and P this reopens when ADP and P are trying to create ATP

4

What is the protein channel?

Paul is allowed charged particles to pass through and this does not require ATP

5

What is active transport?

The movement of a substance from an area of low concentration to an area of high concentration against a concentration gradient using ATP energy and protein carriers

6

What is an example of co transport?

NHS is pumped out of the cell which requires ATP
Sodium diffusers out of the cell by facilitated diffusion
Sodium and glucose combine and enter the cell at protein channels

7

What is simple diffusion?

A substance which moves from on area of high concentration to an area of low concentration down a concentration gradient passively

8

What is hypertonic?

Lower conc than cell cytoplasm so water leaves cell and shrivels and shrinks

9

Why Isotonic?

Same conc as cell cytoplasm, no water movement

10

What is Hypotonic?

Higher conc than cell cytoplasm, water enters cell. Cells stretch and burst

11

What factors affect the rate of uptake?

Conc gradient- the greater the difference, the faster the movement
Thickness- the thinner the pathway, the quicker the movement
Surface area- the larger the exchange area, the faster the movement

12

Glycoprotein

Protein with carbohydrate
Cell recognition

13

Glycolipid

Lipid with carbohydrate
Cell recognition

14

Cholesterol

Reduces fluidity to add structure

15

channel protein

substance transport

16

extrinsic

not fully embedded in membrane

17

intrinsic

fully embedded in membrane

18

cytosolic

cell signal recognition

19

specialised membraness

may have more proteins to aid transport or reduces the rate i.e.) surface area is increased by microvilli