Podcast
Questions and Answers
What is the main reason why water moves easily through cell membranes?
What is the main reason why water moves easily through cell membranes?
- Attraction to hydrophilic regions (correct)
- Attraction to solute particles
- Attraction to hydrophobic regions
- Repulsion from lipid bilayer
Which type of movement involves substances passing through a membrane based on size and shape?
Which type of movement involves substances passing through a membrane based on size and shape?
- Diffusion
- Facilitated diffusion (correct)
- Osmosis
- Active transport
When does diffusion occur?
When does diffusion occur?
- Only with gases
- Against a concentration gradient
- Without energy requirement (correct)
- With external stimulation
What is the key concept representing the balance between water and solute concentrations in osmosis?
What is the key concept representing the balance between water and solute concentrations in osmosis?
In which type of solution do cells tend to swell due to a lower solute concentration outside the cell?
In which type of solution do cells tend to swell due to a lower solute concentration outside the cell?
Which process involves moving substances against the concentration gradient and requires energy input?
Which process involves moving substances against the concentration gradient and requires energy input?
What role do channel proteins play in facilitating substances through a cell membrane?
What role do channel proteins play in facilitating substances through a cell membrane?
Flashcards are hidden until you start studying
Study Notes
- Cell membranes are selectively permeable structures made of a lipid bilayer with hydrophobic and hydrophilic components.
- Water moves easily through cell membranes due to its unique properties, attracted to hydrophilic regions.
- Channel proteins embedded in the membrane allow only specific substances to pass through based on size and shape.
- Diffusion is the passive movement of substances from high to low concentration along a concentration gradient.
- Diffusion occurs without external stimulation or energy requirement, commonly observed with gases and solutes.
- Facilitated diffusion involves the assistance of channel proteins for substances that are too large to pass through the membrane on their own.
- Osmosis is the passive movement of water molecules through a selective membrane, influenced by solute concentration.
- Water potential is a key concept in osmosis, representing the balance between water and solute concentrations.
- Hypotonic solutions have low solute and high water concentrations, while hypertonic solutions have high solute and low water concentrations.
- Active transport involves moving substances against the concentration gradient, requiring energy input like ATP and specific channel proteins.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
