What does it mean that the cell membrane is selectively permeable?
Cell Transport and Membranes

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Biology
•
9th - 10th Grade
•
Hard
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1.
FLASHCARD QUESTION
Front
Back
It means that certain things can enter while others cannot.
2.
FLASHCARD QUESTION
Front
What is facilitated diffusion?
Back
It is a process where special proteins help move particles across the cell membrane without the need for energy.
3.
FLASHCARD QUESTION
Front
What cellular structure controls what substances may enter or leave cells?
Back
The cell membrane.
4.
FLASHCARD QUESTION
Front
What term describes a substance that is 'water fearing'?
Back
Hydrophobic.
5.
FLASHCARD QUESTION
Front
What does it mean for a membrane to be selectively (or semi) permeable?
Back
It means that some molecules can cross the membrane while others cannot.
6.
FLASHCARD QUESTION
Front
What is the primary function of the cell membrane?
Back
To maintain homeostasis by regulating the entry and exit of substances.
7.
FLASHCARD QUESTION
Front
What is the difference between active transport and passive transport?
Back
Active transport requires energy to move substances against their concentration gradient, while passive transport does not.
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