Concept of Movement of Substances Across a Plasma Membrane (5)

Biology

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Concept of Movement of Substances Across a Plasma Membrane (5)

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Characteristics of an active transport (2)

Carrier proteins involved in active transport are known as pumps

Similarities between passive and active transports (1)

Both occurs through a selectively permeable membrane

Similarities between passive and active transports (2)

Both moving a substance across a membrane

Differences between passive and active transports (1)

Energy is not required in passive transports while active transport requires energy

Differences between passive and active transports (2)

Passive transports occurs following the concentration of the gradient while active transports occurs against the concentration of the gradient

Differences between passive and active transports (3)

Passive transport occurs until a dynamic equilibrium is achieved while in active transport, there are accumulation and disposal of molecules or ions

The mechanism of the sodium-potassium pump (1)

Three sodium ions bind to the carrier protein

The mechanism of the sodium-potassium pump (2)

- ATP molecules (adenosine triphosphate) decompose into ADP (adenosine diphosphate) and P (phosphate) - The phosphate group is bound to the carrier protein

The mechanism of the sodium-potassium pump (3)

Phosphate bond provides energy and changes the shape of the carrier protein, then sodium ion is transported through the carrier protein out of a cell

The mechanism of the sodium-potassium pump (4)

- Two potassium ions from outside the cell bind with a carrier protein - The phosphate group leaves the carrier protein

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Concept of Movement of Substances Across a Plasma Membrane (5)

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