Active And Co Transport Flashcards
What is active transport
Movement of a substance from an area of low concentration to high concentration using atp and carrier proteins
What are the 5 steps of active transport of a single molecule
- binds
- hydrolysed
- opens
- released
- shape
- molecule binds to carrier protein receptor site
- atp binds to protein and is hydrolysed to adp and a phosphate which provides energy
- protein changes shape and opens to the other side of the membrane
- molecule can then be released
- when phosphate molecule is released from protein it goes back to its original shape
What is co transport
The transport of one substance coupled with the transport of another substance across a plasma membrane in same direction thru same protein
Example of co transport of glucose
Glucose from small intestine-> epithelial cells-> blood
De3scribe the co transport of glucose
-Na ions are actively transported out of the epithelial cells into blood by na/k pump
- creating a conc gradient
- the conc gradient causes na ions to diffuse down the conc gradient through na glucose co transporter protein
- high conc of glucsoe inside cell
- so glucose diffuses into blood down conc gradient
3 factors that affect the rate of active transport
Speed of carrier proteins
Number of carrier protein
Rate of respiration
How does the speed of carrier proteins affect rate of transport
The faster they work, the faster the rate of active transport
How do the number of carrier proteins affect rate of active transport
More proteins the higher rate
How does more respiration lead to a higher rate of resporuation
More respiration means more atp to provide energy for active transport to occur
What if facilitated diffusion
Protein carrier molecules to allow the passive movement of substances across a plasma membrane
