Active Transport

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What is active transport?
The movement of molecules or ions from a region of low concentration to a region of high concentration, up a concentration gradient.
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Why is it describes as active?
Because this process requires energy in the form of ATP
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What protein in involved in active transport?
Carrier proteins
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Describe how the carrier protein changes shape in active transport (the first stage of active transport)
1) Molecule/ion binds to receptors on carrier protein, 2) ATP binds to the protein and hydrolyses, ADP is given off and the phosphate molecule binds to the protein, 3) The binding of the phosphate causes the protein to change shape
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Describe what happens after the carrier protein changes shape
1) The change in shape opens up the protein to the inside of the cell, 2) The molecule is released into the cell, 3) Phosphate molecule is released and recombines with ADP to form ATP, 4) the carrier protein returns to normal shape
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What is bulk transport?
Another form of active transport which occurs when the molecule is too large to move through channel or carrier proteins
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What 2 types of endocytosis are there?
Phagocytosis (for solids) and pinocytosis (for liquids)
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Describe endocytosis
The transport into the cell, membrane invaginated when it comes into contact with material, enfolds material, pinches off into a vesicle and moves into cytoplasm
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What is exocytosis?
The transport out of the cell, secretory vesicle (usually from golgi) fuses with membrane, the contents is release out of the cell and the vesicle membrane is added to the plasma membrane
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Why is ATP required in bulk transport?
For the movement of vesicles with the cytoskeleton, changing shape to engulf material and the fusion of vesicles to the cell membrane
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Card 2

Front

Why is it describes as active?

Back

Because this process requires energy in the form of ATP

Card 3

Front

What protein in involved in active transport?

Back

Preview of the front of card 3

Card 4

Front

Describe how the carrier protein changes shape in active transport (the first stage of active transport)

Back

Preview of the front of card 4

Card 5

Front

Describe what happens after the carrier protein changes shape

Back

Preview of the front of card 5
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