Biology Section 3.4
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| What is passive transport? | The movement of a substance across a membrane DOWN the concentration gradient.
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| Is diffusion passive or active transport? | Passive because solutes go from higher concentration to lower concentration.
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| What is concentration gradient? | the process of particles moving through a solution from an area of higher number of particles to an area of lower number of particles.
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| How do we know when a system has reached equilibrium? | when both sides are moving equally
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| What is osmosis? | Diffusion of water across a selectively permeable membrane
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| How does osmosis relate to solute concentrations? | When solute concentration is lower, the concentration of water is higher, and when the solute concentration is higher, the concentration of water is lower.
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| Isotonic solution | When the concentration of two solutions is the same
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| Hypertonic solution | when comparing two solutions, the solution with the greater concentration of solutes
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| Hypotonic solution | when comparing two solutions, the solution with the lesser concentration of solutes
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| Compare Passive Transport and Facilitated Diffusion | They both move things across cell membranes going from high to low.
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| Contrast Passive Transport and Facilitated Diffusion | Passive transport slips through the membrane, but diffusion needs help from protein.
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