d3vkfc
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what's the difference between cell surface membrane and phospholipid bilayer membranes proteins. I don't understand
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Trumbles
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Not sure I'm understanding your question.
The cell membrane consists primarily of a double layer (bilayer) of phospholipid molecules. Phospholipids are lipids (fats/oils) with a phosphate group added or swapped in.

There are some proteins embedded amongst the phospholipid molecules. These can move around amongst the phospholipid molecules (which is where the 'fluid' bit comes from in the phrase 'fluid mosaic model' if you've heard that). The proteins are mostly important for transporting substances in or out of the cell which would not otherwise diffuse through the phospholipid bilayer.

Proteins are different types of molecule from phospholipid. For one thing, they contain different elements. Llipids contain carbon, hydrogen and oxygen only, plus phosphorus in phospholipid. Proteins contain carbon, hydrogen, oxygen and nitrogen, and sometimes sulfur.
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d3vkfc
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(Original post by Trumbles)
Not sure I'm understanding your question.
The cell membrane consists primarily of a double layer (bilayer) of phospholipid molecules. Phospholipids are lipids (fats/oils) with a phosphate group added or swapped in.

There are some proteins embedded amongst the phospholipid molecules. These can move around amongst the phospholipid molecules (which is where the 'fluid' bit comes from in the phrase 'fluid mosaic model' if you've heard that). The proteins are mostly important for transporting substances in or out of the cell which would not otherwise diffuse through the phospholipid bilayer.

Proteins are different types of molecule from phospholipid. For one thing, they contain different elements. Llipids contain carbon, hydrogen and oxygen only, plus phosphorus in phospholipid. Proteins contain carbon, hydrogen, oxygen and nitrogen, and sometimes sulfur.
-evaluate the following statement.
‘The variety of different proteins present in the cell surface membrane makes them more important than the phospholipid bilayer to the functioning of that cell.’-
so this question confused me, I understood the phospholipid bilayer but I swear that this phospholipid bilayer was what made the cell surface membrane
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Med3
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There are a lot of cell surface proteins embedded in the membrane, channel proteins etc that allow control of substances by facilitated diffusion and active transport
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thedecorator33
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(Original post by d3vkfc)
-evaluate the following statement.
‘The variety of different proteins present in the cell surface membrane makes them more important than the phospholipid bilayer to the functioning of that cell.’-
so this question confused me, I understood the phospholipid bilayer but I swear that this phospholipid bilayer was what made the cell surface membrane
The phospholipid bilayer is a component of the cell surface membrane. The cell surface membrane is made up of the phospholipid bilayer amongst other things such as proteins and cholesterol. You need to compare the different proteins of a cell surface membrane (e.g. glycoproteins, channel proteins, carrier proteins) to the phospholipid bilayer part of the membrane.
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d3vkfc
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yep that makes a lot more sense, thank you
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