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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?
- To facilitate communication between cells.
- To provide energy to the cell.
- To control the movement of substances in and out of the cell. (correct)
- To store genetic information.
Which of the following processes does not require energy?
Which of the following processes does not require energy?
- Active transport
- Exocytosis
- Endocytosis
- Facilitated diffusion (correct)
What role do proteins play in the cell membrane?
What role do proteins play in the cell membrane?
- They store nutrients for the cell.
- They are solely responsible for energy production.
- They provide rigidity to the cell membrane.
- They assist in the transport of substances across the membrane. (correct)
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
- 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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