AP Bio Insta-Review Topic 2.9*: Mechanisms of Transport

Front

What is passive transport?

Back

Passive transport is the movement of substances across a cell membrane without the use of energy, moving along the concentration gradient.

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What is active transport?

Back

Active transport is the movement of substances across a cell membrane that requires energy input, moving against the concentration gradient.

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How are secreted proteins transported across the cell membrane?

Back

Secreted proteins are moved across the membrane through bulk transport mechanisms, such as exocytosis.

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What role do microtubules play in cellular transport?

Back

Microtubules provide the structural pathway for vesicles to move towards the cell membrane during transport.

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What is facilitated diffusion?

Back

Facilitated diffusion is a type of passive transport that utilizes transport proteins to help move substances across the cell membrane.

Front

What is the concentration gradient?

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The concentration gradient is the difference in the concentration of a substance across a space, which drives the movement of substances during passive transport.

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What is exocytosis?

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Exocytosis is a process where cells expel materials in vesicles that fuse with the plasma membrane, releasing their contents outside the cell.

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What is endocytosis?

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Endocytosis is the process by which cells internalize substances by engulfing them in a vesicle formed from the plasma membrane.

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What are transport proteins?

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Transport proteins are integral membrane proteins that assist in the movement of ions and molecules across the cell membrane.

Front

What is osmosis?

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Osmosis is the diffusion of water across a selectively permeable membrane, moving from an area of lower solute concentration to an area of higher solute concentration.