2 Cell Membranes Flashcards Preview

MCD Introduction To Cells > 2 Cell Membranes > Flashcards

Flashcards in 2 Cell Membranes Deck (7)
Loading flashcards...
1
Q

Why do hydrophobic tails face inwards?

A

Minimise contact with water

2
Q

What is the most basic class of phospholipid and its structure?

A

Phosphatidylcholines

CHOLINE
PHOSPHATE
GLYCEROL

TAILS

3
Q

Define symporters and give and example.

A

Sugars eg glucose and aa can be dragged into cell (against their own conc gradient) with Na+ as it moves down its concentration gradient

Called cotransport

4
Q

Define antiporters and give an example.

A

Molecules move (against their own conc gradient) in opposite direction to Na+ eg. H+

5
Q

Protein functions on membrane

A
Signalling 
Receptors 
Transporters
Adhesion 
E- carrier
6
Q

What does Na K pump do?

A

3Na out and 2K in (Na move in naturally)

Negative intracellular potential

7
Q

How can external chemical signals be sensed in the interior of a cell?

A

Primary messenger eg hormone is detected by receptor which causes production of secondary messenger within cell