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Flashcards in The Cell Surface Deck (12):
1

Why are proteins and lipids on cell surface attached to sugars

To protect, lubricate and recognise cells

2

What does amphipathic mean

Both hydrophobic and hydrophilic

3

What determines the fluidity of membrane

Fatty acid chains

4

What does cholesterol do

Add rigidity in membrane. This makes membrane less permeable

5

What is a transmembrane protein

Protein that goes from one side of membrane to another

6

What determines transport across membranes

Electrochemical gradient = charges and concentration

7

What are the 3 main ways of Active Transport

Coupled Transporters - couple transport of one solute with gradient to one against the gradient
ATP Driven Pump - Couple transport of 1 solute against its gradient to hydrolysis of ATP
Light driven pumps - Coupe transport of 1 solute against its gradient to light input

8

Explain symport

Binding of one molecule dependent on binding of another
Cooperative binding

9

Explain antiporter

One molecule go one way and another the other way

10

What are intracellular signal transduction liquid

Rapidly generated by enzyme in response to specific signal
Bind to conserved regions in protein to induce conformational change

11

How does Active Transport work

ATP hydrolysis = phosphorylases catalytic sub unit so conformational change. Allow solute to travel
K+ hen bind to other side and causes dephosphorylation via ATPase
Conformational change to normal

12

What is one function of Active transport

Maintain Na+ electrochemical gradient