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Biology /4.4: Active Transport

4.4: Active Transport

Biology4 CardsCreated 17 days ago

Active transport moves molecules against a concentration gradient using ATP and carrier proteins, unlike passive processes like facilitated diffusion, which move substances along the gradient without energy. Both involve specific carrier proteins, but only active transport requires metabolic energy and works against concentration differences.

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Define active transport

The movement of molecules or ions into 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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Key Terms

Term
Definition

Define active transport

The movement of molecules or ions into or out of a cell from a region of lower concentration to a region of higher concentration using ATP and carr...

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How does active transport differ from passive forms of transport?

  • Metabolic energy in the form of ATP is required
    -Substances are moved against a concentration gradient instead of along one
    -Carrier ...

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Describe the direct active transport of a single molecule or ion

  1. Molecule or ion binds to the receptor sites on the carrier protein

  2. On the inside of the cell ATP binds to the carrier protei...

Compare and contrast the process of active transport with facilitated diffusion

Both use carrier proteins
AT occurs against a conc gradient while FD occurs along a conc gradient
AT is active and requires metabolic energy ...

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4.4: Active Transport
TermDefinition

Define active transport

The movement of molecules or ions into or out of a cell from a region of lower concentration to a region of higher concentration using ATP and carrier proteins

How does active transport differ from passive forms of transport?

  • Metabolic energy in the form of ATP is required
    -Substances are moved against a concentration gradient instead of along one
    -Carrier proteins acting as pumped are involved

Describe the direct active transport of a single molecule or ion

  1. Molecule or ion binds to the receptor sites on the carrier protein

  2. On the inside of the cell ATP binds to the carrier protein causing it to split into ADP and Pi causing the protein to change shape and open to the opposite side of the membrane

  3. Molecule or ion is then released to the other side of the membrane

Compare and contrast the process of active transport with facilitated diffusion

Both use carrier proteins
AT occurs against a conc gradient while FD occurs along a conc gradient
AT is active and requires metabolic energy in the form of ATP
FD is passive no metabolic energy required