factors effecting membrane transport

Question 1

what are some factors affecting membrane transport

Answer 1

• concentration gradient
• temperature
• size and shape of cells
• surface area to volume ratio

Question 2

describe the effect concentration gradient has on transport

Answer 2

The higher the concentration the more frequent the collision meaning the faster the rate of diffusion.

Question 3

what is Vmax and how does that correspond to the effective concentration gradient has on transport

Answer 3

Vmax is a point that is reached where the proteins will be transporting at a maximum rate which means the rate will stop increasing

Question 4

why does Vmax occur

Answer 4

because the proteins become saturated

Question 5

describe the ffect temperature has on transport

Answer 5

Increasing the temperature means the molecules are moving faster and colliding more. This means the rate of diffusion will increase

Question 6

describe the effect size and shape of cells have on transport

Answer 6

The higher the SA the greater opportunity for the cell to cross the membrane. However, as the SA increases so does the volume. If the volume is too big then substances must travel further to reach organelles, slowing down transport

Question 7

describe the effect SA to Vol ratio have on transport

Answer 7

When the SA:VOL is high the cell can receive and dispose of material efficiently.

When the SA:VOL is low the cell cannot efficiently receive and dispose of material efficiently

Question 8

what effect do physical factors have on transport

Answer 8

Smaller molecules are able to diffuse through the plasma membrane. Larger molecules transport via transport proteins or bulk transport to cross the membrane

Question 9

what effect do chemical factors have on transport

Answer 9

Uncharged molecules are able to pass through the membrane. Charged molecules cannot, as they are hydrophilic and are repelled by the hydrophobic interior. Charged molecules use transport proteins to cross the membrane