Active Transport Flashcards
How are root hair cells adapted for active transport ?
They are adapters to take up water and ions the plant needs from the soil due to the high jon concentration in the cell which differs to the soil which has a low ion concentration.
What is the definition of active transport ?
The movement of molecules for a region of low to high concentration using ATP.
What are the main differences between active transport and diffusion / facilitated diffusion.
Active transport uses energy from ATP and the molecules are moved against the concentration gradient.
Write the stages in direct active transport.
- Molecules/ ions bind to receptions on the channel or carrier protein.
- Inside the cell, ATP binds to the protein causing it to split into ADP and a phosphate molecule.
- The protein changes shape and opens to the other side of the membrane.
- The molecule/ ion is released to the other side of the membrane. The phosphate is released and the protein reverts to its original shape.
What type of molecules are transported by active transport.
Large polar molecules which are charged.
How does Cyanide (Poison) affect respiration ?
Cynaide will inhibit respiration as enzymes are denatured and mitochondria are disrupted. In the mitochondria, ATP is produced. With the production of ATP being restricted, active uptake will be unable to occur as ATP is required to move sodium ions against the concentration gradient.
