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Questions and Answers
What is the primary function of cell membranes regarding substances?
What is the primary function of cell membranes regarding substances?
Which of the following processes does not require energy?
Which of the following processes does not require energy?
What role do proteins play in the cell membrane?
What role do proteins play in the cell membrane?
Which type of transport requires a concentration gradient?
Which type of transport requires a concentration gradient?
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In which scenario would a substance use active transport?
In which scenario would a substance use active transport?
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Which mechanism allows large particles to enter a cell?
Which mechanism allows large particles to enter a cell?
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What characteristic of the cell membrane helps protect the cell's interior?
What characteristic of the cell membrane helps protect the cell's interior?
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Which type of solution causes a cell to swell due to osmosis?
Which type of solution causes a cell to swell due to osmosis?
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Study Notes
Cell Membrane Function
- Cell membranes act as a barrier, regulating the passage of substances into and out of the cell.
Passive Transport
- Passive transport does not require energy.
Protein Roles
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Proteins embedded within the cell membrane play crucial roles in:
- Transporting substances across the membrane
- Enzymatic activity within the membrane
- Cell signaling and communication
- Cell adhesion and attachment
Concentration Gradient
- Passive transport relies on a concentration gradient, moving substances from an area of high concentration to an area of low concentration.
Active Transport
- Active transport is used when a substance needs to move against its concentration gradient, requiring energy expenditure from the cell.
Large Particle Entry
- Endocytosis is a process that allows large particles to enter the cell by engulfing them in a membrane-bound vesicle.
Membrane Protection
- The phospholipid bilayer of the cell membrane forms a hydrophobic barrier, preventing passage of most water-soluble molecules.
Osmosis and Cell Swelling
- A hypotonic solution has a lower solute concentration than the cell's interior, causing water to move into the cell, leading to swelling.
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