Based on the figure above, which of these experimental treatments would increase the rate of sucrose transport into the cell?

Based on the figure above, which of these experimental treatments would increase the rate of sucrose transport into the cell?

A) decreasing extracellular sucrose concentration
B) decreasing extracellular pH
C) decreasing cytoplasmic pH
D) adding an inhibitor that blocks the regeneration of ATP
E) adding a substance that makes the membrane more permeable to hydrogen ions




Answer: B

Which of the following processes includes all others?

Which of the following processes includes all others?

A) osmosis
B) diffusion of a solute across a membrane
C) facilitated diffusion
D) passive transport
E) transport of an ion down its electrochemical gradient



Answer: D

Which of the following factors would tend to increase membrane fluidity?

Which of the following factors would tend to increase membrane fluidity?

A) a greater proportion of unsaturated phospholipids
B) a greater proportion of saturated phospholipids
C) a lower temperature
D) a relatively high protein content in the membrane
E) a greater proportion of relatively large glycolipids compared with lipids having smaller molecular masses



Answer: A

According to the fluid mosaic model of membrane structure, proteins of the membrane are mostly

According to the fluid mosaic model of membrane structure, proteins of the membrane are mostly

A) spread in a continuous layer over the inner and outer surfaces of the membrane.
B) confined to the hydrophobic interior of the membrane.
C) embedded in a lipid bilayer.
D) randomly oriented in the membrane, with no fixed inside-outside polarity.
E) free to depart from the fluid membrane and dissolve in the surrounding solution



Answer: C