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Q: What is the model to describe the side to side movement of many different molecules in a cell membrane?
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Which process would describe the movement of sugar molecules through a membrane from a region of higher concentration of a region of lower concentration?

Diffusion


Which process would be describe the movement of sugar molecules through membrane from a region of higher concentration to a region of lower concentration?

osmosis


What is the movement of molecules through a membrane due to the pressure of a liquid on that membrane?

Osmosis.


Diffusion is defined as a movement of molecules?

Is Diffusion the movement of molecules from a greater to a lesser concentration.


Movement of water molecules across the membrane is the result of?

osmosis


Can diffusion occur without membrane?

Diffusion is the movement of molecules kineticly from an area of high concentration to an area of low concentration until they are evenly distributed. Osmosis is the movement of molecules thru a membrane.


What might happen if a disease caused a plasma membrane to thicken?

decreased movement of molecules entering the cells decreased movement of molecules entering the cells


When molecules are moving back and forth across the membrane will they ever stop moving?

Yes, in an isotonic solution the movement of molecules across the membrane will stop.


What are molecules that helps control the movement of a substance through the cell membrane?

Proteins


What is the movement of molecules through a cell membrane requiring energy?

active transport


What is the movement of water molecules through a sectively-permeable cell membrane?

osmosis


Is this correct no energy is required for the movement of water molecules across the cell membrane?

No