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Biology National 5 Unit 1 > Transport across cell membrane > Flashcards

Flashcards in Transport across cell membrane Deck (11)
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1

What can cross the cell membrane and how fast

small molecules can pass fast
medium can pass slowly

2

What is the cell membrane made of

phospholipids and proteins

3

What do the proteins do

Channel Proteins to carry molecules
Receptors for hormones

4

What can you describe the cell membrane as

Fluid Mosaic Model

5

What is diffusion

The movement of molecules down a concentration gradient from a high concentration to low concentration down a concentration gradient through a selectively permeable membrane

6

When does diffusion stop

When concentration is equal but then molecules will continue to move equally in both directions

7

What is osmosis?

Diffusion of water molecules

8

What are examples of passive transport

Diffusion and osmosis

9

Describe a turgid plant cell

Full vacuole and cytoplasm and cell membrane push up against the cell wall

10

Describe a plasmolysed plant cell

Small vacuole and cytoplasm and the cell membrane pulls away from the cell wall

11

What is Active transport

When molecules or ions move from a lower concentration to a higher concentration which require energy and also requires transport protein