Adaptive Practice Ch 5

Which of the following solutions has the highest osmolarity?

3 OsM solution of CaCl2

All active transport uses ATP as a direct energy source.

False

Passive transport processes do not require the cell to expend energy to move particles across the membrane.

True

Transepithelial transport can use both passive and active transport mechanisms.

True

This is a process involving the movement of materials from the lumen of an organ into the blood.

absorption

This occurs when there is a difference in the number of a given type of uncharged particles between the inside and outside of the membrane.

concentration gradient

Molecules tend to move across the plasma membrane

down their concentration gradients

Which of the following is a form of active transport that uses vesicles to move substances into the cell?

endocytosis

Which of the following does NOT affect the diffusion rate?

energy expenditure by cell

Which of the following is NOT a form of vesicular transport used to move materials into the cell?

exocytosis

Liddle's syndrome is a genetic disorder that causes increased reabsorption of sodium in the kidneys. As a result, the person is likely to develop hypertension. Why?

high levels of sodium means water will diffuse into the bloodstream and increase blood volume

Given that the extracellular fluid usually has a higher concentration of sodium ions than the intracellular fluid, when sodium ions diffuse across the plasma membrane, they move

into the cell faster than they move out of the cell

All proteins used as transporters in facilitated diffusion demonstrate all of the following characteristics EXCEPT

lipid solubility

This is the passive movement of water across a selectively permeable membrane.

osmosis

Pseudopods are formed in this type of vesicular transport.

phagocytosis

A sodium potassium pump is an example of which of the following?

primary active transport

Clathrins are used in which of the following?

receptor-mediated endocytosis

Which of the following is NOT a passive transport mechanism that requires a membrane protein?

simple diffusion

Most secondary active transport mechanisms in the body use energy stored in the electrochemical gradient of this ion.

sodium

This is the reason for the membrane being impermeable to ions.

the interior of the membrane is hydrophobic

More cholesterol in the membrane would lower the membranes permeability to which of the following?

water