Podcast
Questions and Answers
What is the main difference between passive and active transport?
What is the main difference between passive and active transport?
Facilitated diffusion involves the use of energy to move solutes across a membrane.
Facilitated diffusion involves the use of energy to move solutes across a membrane.
False
Define osmosis.
Define osmosis.
The diffusion of water molecules from an area of higher concentration to an area of lower concentration.
In __________ transport, molecules move from low concentration to high concentration with the help of pumps.
In __________ transport, molecules move from low concentration to high concentration with the help of pumps.
Signup and view all the answers
Match the following types of passive transport with their descriptions:
Match the following types of passive transport with their descriptions:
Signup and view all the answers
What type of solution has a higher concentration of solute compared to the cell's cytoplasm?
What type of solution has a higher concentration of solute compared to the cell's cytoplasm?
Signup and view all the answers
In an isotonic solution, the concentrations of solute inside and outside the cell are unequal.
In an isotonic solution, the concentrations of solute inside and outside the cell are unequal.
Signup and view all the answers
What is the role of ATP in active transport?
What is the role of ATP in active transport?
Signup and view all the answers
Water moves from a ______ solution to a ______ solution during osmosis.
Water moves from a ______ solution to a ______ solution during osmosis.
Signup and view all the answers
Match the following terms with their definitions:
Match the following terms with their definitions:
Signup and view all the answers
Study Notes
Membrane Transport Overview
- Types of Membrane Transport: Distinction between passive and active transport.
- Passive Transport: Occurs without energy; substances move from areas of high concentration to low concentration.
- Active Transport: Requires energy (ATP); substances move from low concentration to high concentration, facilitated by proteins known as pumps.
Passive Transport Mechanisms
- Diffusion: Movement of solutes from high to low concentration through a permeable membrane.
- Osmosis: Special case of diffusion where water molecules move to equalize solute concentrations across a selectively permeable membrane.
- Facilitated Diffusion: Uses membrane proteins to assist in transporting solutes, involving channels and transporters.
Osmosis Details
- Water Movement: Flows from areas of high free water concentration to low free water concentration, or from low solute concentration to high solute concentration.
-
Types of Solutions:
- Hypertonic: Higher concentration of solute outside the cell, leading to potential cell shrinkage.
- Hypotonic: Lower concentration of solute outside the cell, which may cause the cell to swell or burst.
- Isotonic: Equal concentrations of solute inside and outside of the cell, allowing for stable cell volume.
Effects of Tonicity on Cells
- Animal Cells: Changes in osmotic pressure in different tonicity conditions can alter cell shape and function.
- Plant Cells: Turgor pressure, critical for maintaining structure, depends on external solution tonicity.
Active Transport Details
- Energy Requirement: Active transport relies on ATP to move molecules against their concentration gradient.
- Sodium-Potassium Pump: A specific example of a pump that transports sodium out of and potassium into cells, critical for maintaining electrochemical gradients.
Bulk Transport Mechanisms
- Bulk Transport: Involves moving large particles or cellular fragments across the membrane.
-
Types of Endocytosis:
- Phagocytosis: Engulfing large particles or molecules.
- Pinocytosis: Intake of large volumes of liquid.
- Receptor-Mediated Endocytosis: Specific molecules bind to receptors before uptake.
- Exocytosis: Process of vesicles migrating to the plasma membrane to release their contents outside the cell.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Related Documents
Description
Understand the proper attribution and usage rights for OpenStax resources, particularly concerning modifications and licenses. This quiz will help you assess your knowledge of copyright practices related to educational materials.
