front 1 Describe two variables that affect the rate of diffusion? | back 1 size of material and concentration of gradient. |
front 2 Why do you think the Urea was not able to diffuse through the 20MWCO membrane? | back 2 because urea was too big to pass through the 20 MWCO membrane. |
front 3 Describe the result of the attempt to diffuse glucose and albumin through the 200 MWCO membrane? | back 3 the glucose diffused through the 200MWCO membrane, while there was no diffusion of albumin. |
front 4 Put the following in order from the smallest to largest molecular weight: glucose, sodium chloride, albumin, urea. | back 4 sodium chloride, urea, glucose, albumin. |
front 5 Explain one way in which facilitated diffusion is the same as simple diffusion and one way in which it differs. | back 5 both are passive diffusion that are from high concentration gradient to a low concentration gradient. facilitated differs from simple because it requires a carrier protein to diffuse. |
front 6 The larger value obtained when more glucose carriers were present corresponds to an increase in the rate of glucose transport. Explain why the rate increased. | back 6 the rate increased because there is more room and surface area increases relative to glucose. |
front 7 Explain the effects that increasing the NaCl concentration had on osmotic pressure and why it has this effect. | back 7 Increasing the NaCl will increase the osmotic pressure. because water needs to diffuse to the higher concentration gradient until equilibrium is reached. |
front 8 Describe one way in which Osmosis is similar to simple diffusion and one way in which it is different. | back 8 both are passive transports of high concentration gradient to low concentration gradient. Osmosis differs because it is the diffusion of water from a high to a low concentration gradient through a selective permeable membrane. |
front 9 the conditions were 9 mM albumin in the left beaker and 10 mM glucose in the right beaker with the 200 MWCO membrane in place. Explain the results. | back 9 glucose diffuses from right beaker to the left beaker until equilibrium is reached. albumin can't diffuse through the membrane and osmotic pressure of 153mmHg results. |
front 10 which solute did not appear in the filtrate using any of the membranes? explain why. | back 10 activated charcoal. |
front 11 why did increasing the pressure increased the filtration rate but not the concentration of solutes? | back 11 because the pressure allows for more movement through the membrane but equilibrium was not reached. |
front 12 describe the significance of using 9mM sodium chloride inside the cell and 6 mM potassium chloride outside the cell, instead of other concentration ratio. | back 12 because the Na/K pump allows for 3:2 ratio. |
front 13 Explain why there was no sodium transport even though ATP was present. | back 13 in order for Na/K pump to function both ions need to be present even if ATP is present. since only Na was present it would use a passive diffusion down the concentration gradient. |
front 14 Explain why the addition of glucose carriers had no effect on sodium or potassium transport. | back 14 because glucose concentration does not affect the Na/K concentration. it only has affect on glucose itself. |
front 15 do you think glucose is being actively transported or transported by facilitated diffusion in this experiment? explain you answer. | back 15 it is being transported by facilitated diffusion. since glucose is a lipid insoluble and too large to pass through the membrane it requires a carrier but not ATP. |