Chapter 7 : Membrane Structure and Function

Front

What is the function of membrane proteins with short sugar chains?

Back

They form identification tags that are recognized by other cells, which is important for immune function.

Front

What happens to a plant cell placed in an isotonic solution when salt is added?

Back

Water would leave the cell by osmosis, causing the volume of the cytoplasm to decrease.

Front

What is diffusion?

Back

Diffusion is the passive movement of molecules from a region of higher concentration to a region of lower concentration.

Front

What is NOT a function of membrane proteins?

Back

Energy, carbon, and nitrogen storage.

Front

What is facilitated diffusion?

Back

Facilitated diffusion is the process by which substances move across membranes with the help of transport proteins, without the expenditure of energy.

Front

Does facilitated diffusion require ATP?

Back

No, facilitated diffusion does not require the hydrolysis of ATP.

Front

What is osmosis?

Back

Osmosis is the diffusion of water across a selectively permeable membrane.

Front

What is the role of membrane proteins in transport?

Back

Membrane proteins can form channels that move substances across the membrane.

Front

What is a characteristic of passive transport?

Back

It does not require energy expenditure by the cell.

Front

What is the difference between active and passive transport?

Back

Active transport requires energy to move substances against their concentration gradient, while passive transport does not.