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Title: AQA AS BIOLOGY ACTIVE TRANSPORT
Description: Detailed first year (AS) biology notes to aid key revision of topics and enhance knowledge.
Description: Detailed first year (AS) biology notes to aid key revision of topics and enhance knowledge.
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Active transport is: The movement of molecules or
ions in or out of a cell from a region of lower concentration to a region of higher concentration using
ATP and carrier proteins
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The carrier proteins span the plasma membrane to bind to the molecule or ion to be transported on one
side of it
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The molecule or ion binds to receptor sites on the carrier protein
...
On the inside of the cell/organelle, ATP binds to the protein, causing it to split into ADP and a phosphate
molecule
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4
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5
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The phosphate molecule then recombines with the ADP to
form ATP during respiration
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This is known as co-transport
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Substances are moved against a concentration gradient,
that is from a lower to a higher concentration
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The process is very selective, with specific substances being
transported
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Occasionally, the molecule or ion I being moved
into a cell/organelle at the same time as a different one is being removed from it
...
Within this, sodium ions are actively removed from the cell/organelle while potassium ions are actively taken in from the surroundings
...
Title: AQA AS BIOLOGY ACTIVE TRANSPORT
Description: Detailed first year (AS) biology notes to aid key revision of topics and enhance knowledge.
Description: Detailed first year (AS) biology notes to aid key revision of topics and enhance knowledge.