Podcast
Questions and Answers
What type of transport is diffusion?
What type of transport is diffusion?
What direction do molecules move during osmosis?
What direction do molecules move during osmosis?
High to a low concentration
Facilitated diffusion requires energy.
Facilitated diffusion requires energy.
False
What is necessary for facilitated diffusion?
What is necessary for facilitated diffusion?
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What type of transport is a protein pump?
What type of transport is a protein pump?
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Phagocytosis is often referred to as _____ because it involves 'cell-eating.'
Phagocytosis is often referred to as _____ because it involves 'cell-eating.'
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During receptor-mediated endocytosis, substances move in what direction?
During receptor-mediated endocytosis, substances move in what direction?
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What is the primary function of exocytosis?
What is the primary function of exocytosis?
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Pinocytosis is a form of 'cell-drinking.'
Pinocytosis is a form of 'cell-drinking.'
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Study Notes
Cell Transport
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Diffusion
- Passive transport mechanism
- Small nonpolar molecules (e.g., oxygen, carbon dioxide) pass directly through the cell membrane
- Movement occurs from high to low concentration
- No energy or proteins required
-
Osmosis
- Passive transport specifically for water
- Water moves across the cell membrane from high to low concentration
- Requires no energy or proteins
-
Facilitated Diffusion
- Passive transport helped by carrier proteins
- Moves substances like polar molecules (e.g., water) and ions (e.g., salts) down their concentration gradient
- Direction is from high to low concentration
- Does not require energy, but proteins are necessary
-
Protein Pump
- Active transport via carrier proteins using energy
- Moves substances against their concentration gradient from low to high concentration
- Energy and proteins are required
-
Receptor Mediated Endocytosis
- Active transport mechanism involving receptor proteins
- Specific substances bind to receptors, triggering endocytosis
- Direction of movement from low to high concentration
- Requires energy and proteins
-
Phagocytosis
- Active transport process also known as "cell-eating"
- Cells engulf solid materials using vesicles
- Movement is from low to high concentration
- Energy required, but proteins are not needed
-
Pinocytosis
- Active transport process also known as "cell-drinking"
- Cells take in liquids via vesicles
- Direction of transport is from low to high concentration
- Requires energy without the need for proteins
-
Exocytosis
- Active transport mechanism for expelling substances
- Waste and hormones are secreted from the cell
- Movement occurs from low to high concentration
- Requires energy but no proteins are needed
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Description
Explore the various methods of cell transport including diffusion, osmosis, facilitated diffusion, and active transport mechanisms like protein pumps. This quiz covers how these processes function and their importance in cellular behavior. Test your understanding of how substances move across cell membranes!
