Cell membranes

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  • Created by: amm242
  • Created on: 01-05-18 15:28
What is the function of the cell-surface membrane?
It controls the movement of substances in and out of the cell
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Which end of the phospholipid lies on the inside of the cell?
Hydrophobic tail
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Which is the hydrophilic end of a phospholipid molecule?
The head
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What molecules pass through channel proteins water filled tubes?
Water-soluble ions
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What is the role of carrier proteins?
They bind to ions or molecules like glucose and amino acids, then change shape to pass the molecules through membrane
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Why is the cell-surface membrane described as fluid mosaic?
Fluid because the individual phospholipids can move, making the membrane a flexible structure that constantly changes shape. Mosaic because the proteins embedded in the membrane are all different shapes and sizes.
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What is the function of the phospholipids?
Allow lipid soluble substances to go in and out of the cell. Prevent water soluble substances going in and out. Make membrane flexible and self-sealing.
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Why is it described as a bilayer?
It has two layers of phospholipids
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Other than being channel/carrier proteins, what are the functions of proteins?
Provide structural support. Form cell-surface receptors. Help cells adhere together.
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Why are cholestrol molecules hydrophobic?
To prevent loss of water and dissolved ions from the cell.
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Describe a glycoprotein
Carbohydrate chain attached to extrinsic proteins which act as recogntion sites for chemicals such as hormones.
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Describe a glycolipid
Carbohydrate covalently bonded to a lipid which acts as a recognition site
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Why are plasma membranes used to isolate enzymes?
Some of them, such as lysosomes, can damage the cell
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What are properties a molecule needs if it is to enter a cell rapidly
Lipid soluble, small, no electrical charge (or one opposite to protein channels)
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An example of a reaction which occurs on plasma membranes
Protein synthesis using ribosomes on rough endoplasmic reticulum
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Why are there plasma membranes around organelles?
To seperate them from the cytoplasm so specific metabolic reactions can occur within them
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Why are there plasma membranes around organelles?
To seperate them from the cytoplasm so specific metabolic reactions can occur within them
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Other cards in this set

Card 2

Front

Which end of the phospholipid lies on the inside of the cell?

Back

Hydrophobic tail

Card 3

Front

Which is the hydrophilic end of a phospholipid molecule?

Back

Preview of the front of card 3

Card 4

Front

What molecules pass through channel proteins water filled tubes?

Back

Preview of the front of card 4

Card 5

Front

What is the role of carrier proteins?

Back

Preview of the front of card 5
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