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Questions and Answers
Which process involves the movement of water across a partially permeable membrane from high concentration to low concentration?
Which process involves the movement of water across a partially permeable membrane from high concentration to low concentration?
Which of the following best describes a hypertonic solution?
Which of the following best describes a hypertonic solution?
What mechanism allows a cell to take up large quantities of specific substances?
What mechanism allows a cell to take up large quantities of specific substances?
Which process is characterized as 'cell drinking'?
Which process is characterized as 'cell drinking'?
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Which of the following statements about facilitated diffusion is accurate?
Which of the following statements about facilitated diffusion is accurate?
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What defines facilitated diffusion in cellular processes?
What defines facilitated diffusion in cellular processes?
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Which of the following describes phagocytosis?
Which of the following describes phagocytosis?
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How is a hypotonic solution characterized?
How is a hypotonic solution characterized?
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What happens during exocytosis?
What happens during exocytosis?
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What is a defining characteristic of a hypertonic solution?
What is a defining characteristic of a hypertonic solution?
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Study Notes
Passive Transport Mechanisms
- Occurs without ATP or energy expenditure.
- Involves movement from high concentration to low concentration.
Types of Passive Transport
-
Diffusion:
- Movement of gases or salts from areas of high concentration to low concentration.
-
Osmosis:
- Specific to water, moving from high concentration to low concentration across a selectively permeable membrane.
-
Facilitated Diffusion:
- Involves movement of salts through protein channels in the cell membrane, from high concentration to low concentration.
Active Transport Mechanisms
-
Requires energy to move substances against their concentration or electrical gradients.
-
Exocytosis:
- Active process of releasing molecules from a cell.
Types of Endocytosis
-
Pinocytosis (Cell Drinking):
- Uptake of large, dissolved molecules by the cell.
-
Phagocytosis:
- Engulfing of large particles, exemplified by human white blood cells engulfing bacteria.
-
Receptor-Mediated Endocytosis:
- Allows cells to intake specific substances in larger quantities.
- Extracellular substances bind to specific receptors on the cell membrane, and are engulfed into vesicles.
Solution Types
-
Hypertonic Solution:
- Has a higher concentration of solute compared to another solution.
-
Hypotonic Solution:
- Has a lower concentration of solute compared to another solution.
-
Isotonic Solution:
- Two solutions with equal concentrations of solute.
Passive Transport Mechanisms
- Occurs without ATP or energy expenditure.
- Involves movement from high concentration to low concentration.
Types of Passive Transport
-
Diffusion:
- Movement of gases or salts from areas of high concentration to low concentration.
-
Osmosis:
- Specific to water, moving from high concentration to low concentration across a selectively permeable membrane.
-
Facilitated Diffusion:
- Involves movement of salts through protein channels in the cell membrane, from high concentration to low concentration.
Active Transport Mechanisms
-
Requires energy to move substances against their concentration or electrical gradients.
-
Exocytosis:
- Active process of releasing molecules from a cell.
Types of Endocytosis
-
Pinocytosis (Cell Drinking):
- Uptake of large, dissolved molecules by the cell.
-
Phagocytosis:
- Engulfing of large particles, exemplified by human white blood cells engulfing bacteria.
-
Receptor-Mediated Endocytosis:
- Allows cells to intake specific substances in larger quantities.
- Extracellular substances bind to specific receptors on the cell membrane, and are engulfed into vesicles.
Solution Types
-
Hypertonic Solution:
- Has a higher concentration of solute compared to another solution.
-
Hypotonic Solution:
- Has a lower concentration of solute compared to another solution.
-
Isotonic Solution:
- Two solutions with equal concentrations of solute.
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Description
Explore the three main types of diffusion: diffusion, osmosis, and facilitated diffusion. Learn how each process operates, from high to low concentration, without the expenditure of energy. This quiz will test your understanding of cellular transport mechanisms.
