The Cell Membrane Forms A Compartment Or Cell

Question:

Answer: d) Controlling the transport of substances in and out of the cell

Question:

Answer: b) lons

Question: As you can see, an aquaporin has now appeared in the cell membrane. Which types of molecules are transported by aquaporins ?

a) All of these molecules

b) Bulky molecules

c) Charged molecules

d) Water

Answer: d) Water

Question:

Answer: a) It transports molecules against an electrochemical gradient

Question: Which of these options is not a mechanism to control the opening and closing of ion channels?

a) ATP binding (ATP gated)

b) Changes in membrane potential (voltage gated)

c) Distortion of the cell membrane (mechanically gated)

d) Ligand binding (ligand gated)

Answer: a) ATP binding (ATP gated)

Question:

Answer: a) A co-transported molecule travels down an electrochemical gradient in either direction

Question:

Answer: b) To visualize the cell membrane using the fluorescent microscope

Question: Are the molecules able to cross the membrane?

a) No, because there is yellow fluorescence in the cells

b) Yes, because there is green fluorescence in the cells

c) No, because there is red fluorescence in the cells

d) Yes, because there is red fluorescence in the cells

Answer: b) Yes, because there is green fluorescence in the cells

Question:

Answer: d) Hyper-excitability: more Na+ flows into the cell, causing neurons to fire more readily

Question:

Answer: d) The cell membrane is now a selective barrier