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Flashcards in The Cell Surface Deck (12):

Why are proteins and lipids on cell surface attached to sugars

To protect, lubricate and recognise cells


What does amphipathic mean

Both hydrophobic and hydrophilic


What determines the fluidity of membrane

Fatty acid chains


What does cholesterol do

Add rigidity in membrane. This makes membrane less permeable


What is a transmembrane protein

Protein that goes from one side of membrane to another


What determines transport across membranes

Electrochemical gradient = charges and concentration


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


Explain symport

Binding of one molecule dependent on binding of another
Cooperative binding


Explain antiporter

One molecule go one way and another the other way


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


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


What is one function of Active transport

Maintain Na+ electrochemical gradient