Name FIVE components of the Cell Membrane:

Pospholipid Bilayer, Carrier/Channel proteins, Glycoproteins, Cholesterol and peripheral proteins.

What are is function of the Channel Proteins:

To aid in transportation of Larger and Ionic molecules.

What is the function of the Glycoproteins:

The carbohydrate group is involved in cell to cell recognition.

What effect does cholesterol have on the cell membrane?:

Reduces fluidity, causes the cell to become more rigid.

What are some of the functions of the peripheral proteins?:

They can be Enzymes, they can be receptors, recognition,

What types of molecules are able to cross the Pospholipid bilayer:

Non-Polar (except water), Non-Ionic / Charged, Small molecules.

What type of molecules cannot cross the bilayer?

Polar (apart from Water), Ionic or Charged particles and Large Molecules cannot cross.

The movement of free particles / molecules from an area of high concentration to an area of low concentration. Movement down a concentration gradient. No Energy.

Facilitated Diffusion:

The movement of larger, charged or Ionic compounds across a membrane, down the concentration gradient, with the use of a channel protein. No Energy.

The movement of substances from an area of high concentration to an area of low concentration, up a concentration gradient, with the use of ATP. Requires Energy from Metabolism!

A special type of diffusion concerning only water moving across a partially-permeable membrane. Water moves down the concentration gradient, with no energy required.

What is meant by 'free water molecules':

Molecules of water that are not bonded to solute particles and are free to diffuse.

The movement of massive molecules, particles or organisms into a cell; eg in Phagocytosis (eg, the immune response) and Pinocytosis (fluid uptake).

What is Exocystosis?:

The mass movement of particles, large molecules etc out of a cell; eg release of neurotransmitters across the synaptic cleft.

What effect does alcohol have on cell membrane?

Alcohol is an organic solvent, lipids will be dissolved in organic solvents, so high concentrations of alcohol will destroy part of the cell membrane. Increased permeability.

Effects of high temp on Cell membrane?:

Proteins become denatured at high temps, causing the cell membrane to break apart at the areas where the proteins were. Causing other substances to 'leak' out of the cell.

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T2: Cell Membrane

Structure and Function of the Cell Membrane + Transport across

Question	Answer
Name FIVE components of the Cell Membrane:	Pospholipid Bilayer, Carrier/Channel proteins, Glycoproteins, Cholesterol and peripheral proteins.
What are is function of the Channel Proteins:	To aid in transportation of Larger and Ionic molecules.
What is the function of the Glycoproteins:	The carbohydrate group is involved in cell to cell recognition.
What effect does cholesterol have on the cell membrane?:	Reduces fluidity, causes the cell to become more rigid.
What are some of the functions of the peripheral proteins?:	They can be Enzymes, they can be receptors, recognition,
What types of molecules are able to cross the Pospholipid bilayer:	Non-Polar (except water), Non-Ionic / Charged, Small molecules.
What type of molecules cannot cross the bilayer?	Polar (apart from Water), Ionic or Charged particles and Large Molecules cannot cross.
Diffusion:	The movement of free particles / molecules from an area of high concentration to an area of low concentration. Movement down a concentration gradient. No Energy.
Facilitated Diffusion:	The movement of larger, charged or Ionic compounds across a membrane, down the concentration gradient, with the use of a channel protein. No Energy.
Active Transport:	The movement of substances from an area of high concentration to an area of low concentration, up a concentration gradient, with the use of ATP. Requires Energy from Metabolism!
Osmosis:	A special type of diffusion concerning only water moving across a partially-permeable membrane. Water moves down the concentration gradient, with no energy required.
What is meant by 'free water molecules':	Molecules of water that are not bonded to solute particles and are free to diffuse.
What is endocytosis:	The movement of massive molecules, particles or organisms into a cell; eg in Phagocytosis (eg, the immune response) and Pinocytosis (fluid uptake).
What is Exocystosis?:	The mass movement of particles, large molecules etc out of a cell; eg release of neurotransmitters across the synaptic cleft.
What effect does alcohol have on cell membrane?	Alcohol is an organic solvent, lipids will be dissolved in organic solvents, so high concentrations of alcohol will destroy part of the cell membrane. Increased permeability.
Effects of high temp on Cell membrane?:	Proteins become denatured at high temps, causing the cell membrane to break apart at the areas where the proteins were. Causing other substances to 'leak' out of the cell.

Created by: mjwilson1988

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