Bio 172- quiz 9

Which of the following is an example of primary active transport? Glucose enters a cell using facilitated diffusion. ATP directly transfers energy to the Na+/K+ pump to transport ions across the membrane. A small hydrophobic molecule diffuses across the lipid bilayer. Water moves down its concentration gradient through aquaporins.

ATP directly transfers energy to the Na+/K+ pump to transport ions across the membrane.

Which statement about diffusion is false? Diffusion does not require an input of energy. Diffusion is an example of passive transport Diffusion results in a net movement of molecules from high to low concentrations. All types of molecules are able to diffuse across the plasma membrane

All types of molecules are able to diffuse across the plasma membrane

At room temperature, how does cholesterol affect the plasma membrane?

It reduces the mobility of phospholipids.

Cells can use energy to establish an electrochemical gradient. When cells use the electrochemical gradient to help bring another molecule against its gradient into the cell, what is this called?

Secondary active transport

Integral membrane proteins are __________associated with the plasma membrane; peripheral membrane proteins are ___________associated with the plasma membrane

tightly; loosely