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Water, any small molecule and lipids.

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Q: What molecules would easily be able to diffuse through a cell membrane without the help of a transport protein?
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How do you transport proteins in a cell make it easier for certain molecules to diffuse across a membrane?

If there's a transfer protein then its NOT diffusion ... its active transport.


What the role of protein channels in the cell membrane?

Protein channels are important to facilitate the transport of ions and other larger molecules across the plasma membrane. Large molecules cannot just diffuse thorough the membrane. In addition, polar molecules cannot diffuse through the membrane since it would be energetically unfavorable for them to negotiate the hydrophobic interior of the plasma membrane. Therefore, protein channels are essential in membrane transport.


Transport protein that provides a tubelike opening in the plasma membrane through which particles can diffuse?

Channel Protein.


What are the protein molecules in a cell membrane that assist in cell transport?

Protein molecules are responsible for membrane transport. In passive transport diffusion is the phenomenon in which molecules flow naturally from areas of high concentration to lower concentrations.


What is the definition of protein gate?

A protein gate is a pathway through a protein molecule on the plasma membrane in which ions and small molecules can diffuse in or out of a cell.


What protein recognizes certain molecules bringing them across a membrane?

channel or transport or receptor


What molecule uses energy to push molecules through the membrane of a cell?

Transport Protein


A specific protein that recognizes certain molecules bringing them across the membrane?

Receptor Protein.


What is the function of protein channels in the cell membrane?

transport


Is facilitated diffusion?

Facilitated Diffusion is the movement of molecules across cell membranes through protein channels and carrier proteins.Facilitated diffusion is a passive transport process, aka no energy required, where substances move down their concentration gradient (high concentration to low concentration) across a protein through a membrane protein because it is unable to diffuse directly through the phospholipid portion of the membrane itself.Diffusion of molecules assisted by protein channels that pierce a cell membrane


Why do oxygen molecules easily diffuse across a cell membrane while protein molecules do not?

Cell membrane is semipermeable and oxygen molecules have size required for easy passqge while Glucose molecules do not have that size required for easy passage.


What is facilited diffusion?

Facilitated Diffusion is the movement of molecules across cell membranes through protein channels and carrier proteins.Facilitated diffusion is a passive transport process, aka no energy required, where substances move down their concentration gradient (high concentration to low concentration) across a protein through a membrane protein because it is unable to diffuse directly through the phospholipid portion of the membrane itself.Diffusion of molecules assisted by protein channels that pierce a cell membrane