What is the cell membrane?
Cell Membrane & Transport Flashcard

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Science
•
9th - 12th Grade
•
Hard
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1.
FLASHCARD QUESTION
Front
Back
The cell membrane is a biological barrier that separates the interior of a cell from its external environment, composed mainly of a phospholipid bilayer with embedded proteins.
2.
FLASHCARD QUESTION
Front
What is passive transport?
Back
Passive transport is the movement of molecules across the cell membrane without the use of energy, typically moving from an area of high concentration to an area of low concentration.
3.
FLASHCARD QUESTION
Front
What is active transport?
Back
Active transport is the movement of molecules across the cell membrane against their concentration gradient, requiring energy, often in the form of ATP.
4.
FLASHCARD QUESTION
Front
What is diffusion?
Back
Diffusion is the process by which small molecules move from an area of high concentration to an area of low concentration until equilibrium is reached.
5.
FLASHCARD QUESTION
Front
What is facilitated diffusion?
Back
Facilitated diffusion is a type of passive transport that uses protein channels to help larger or polar molecules cross the cell membrane.
6.
FLASHCARD QUESTION
Front
What is endocytosis?
Back
Endocytosis is the process by which cells engulf large molecules or particles by wrapping them in a portion of the cell membrane, forming a vesicle.
7.
FLASHCARD QUESTION
Front
What is exocytosis?
Back
Exocytosis is the process by which cells expel materials by vesicles fusing with the cell membrane, releasing their contents outside the cell.
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