Facilitated Diffusion - AP Biology
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Identify a common feature of molecules that use facilitated diffusion.
Identify a common feature of molecules that use facilitated diffusion.
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They are typically hydrophilic. Water-loving molecules that cannot cross lipid bilayers.
They are typically hydrophilic. Water-loving molecules that cannot cross lipid bilayers.
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What is a carrier protein?
What is a carrier protein?
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A protein that changes shape to move molecules. Undergoes conformational changes during transport.
A protein that changes shape to move molecules. Undergoes conformational changes during transport.
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Identify a situation where facilitated diffusion is crucial in human physiology.
Identify a situation where facilitated diffusion is crucial in human physiology.
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Glucose uptake in muscle cells. Critical for energy metabolism in active tissues.
Glucose uptake in muscle cells. Critical for energy metabolism in active tissues.
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What is the role of membrane proteins in facilitated diffusion?
What is the role of membrane proteins in facilitated diffusion?
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They facilitate the movement of molecules across the cell membrane. Essential components for selective membrane permeability.
They facilitate the movement of molecules across the cell membrane. Essential components for selective membrane permeability.
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Identify the effect of temperature on facilitated diffusion.
Identify the effect of temperature on facilitated diffusion.
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Higher temperatures generally increase rate. Heat increases molecular motion and protein activity.
Higher temperatures generally increase rate. Heat increases molecular motion and protein activity.
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Is facilitated diffusion specific to certain molecules?
Is facilitated diffusion specific to certain molecules?
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Yes, it is selective. Proteins have specific binding sites for target molecules.
Yes, it is selective. Proteins have specific binding sites for target molecules.
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Which transport proteins are involved in facilitated diffusion?
Which transport proteins are involved in facilitated diffusion?
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Channel proteins and carrier proteins. Two main types that facilitate molecular transport.
Channel proteins and carrier proteins. Two main types that facilitate molecular transport.
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What type of cell transport is facilitated diffusion classified as?
What type of cell transport is facilitated diffusion classified as?
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Passive transport. Category of transport requiring no cellular energy.
Passive transport. Category of transport requiring no cellular energy.
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Can facilitated diffusion occur without a protein?
Can facilitated diffusion occur without a protein?
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No, it requires a transport protein. Proteins are essential for this transport mechanism.
No, it requires a transport protein. Proteins are essential for this transport mechanism.
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Does facilitated diffusion move molecules against the concentration gradient?
Does facilitated diffusion move molecules against the concentration gradient?
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No, it moves with the concentration gradient. Follows natural diffusion from high to low concentration.
No, it moves with the concentration gradient. Follows natural diffusion from high to low concentration.
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Identify the role of transport proteins in facilitated diffusion.
Identify the role of transport proteins in facilitated diffusion.
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They assist in moving substances across membranes. Proteins provide selective pathways for specific molecules.
They assist in moving substances across membranes. Proteins provide selective pathways for specific molecules.
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Identify a factor that affects the rate of facilitated diffusion.
Identify a factor that affects the rate of facilitated diffusion.
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Concentration gradient or number of transport proteins. Both determine transport speed and efficiency.
Concentration gradient or number of transport proteins. Both determine transport speed and efficiency.
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What is a channel protein?
What is a channel protein?
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A protein that forms a pore for ions to pass through. Creates a selective tunnel through the membrane.
A protein that forms a pore for ions to pass through. Creates a selective tunnel through the membrane.
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What is the role of ion channels in facilitated diffusion?
What is the role of ion channels in facilitated diffusion?
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They allow specific ions to pass through the membrane. Provide selective permeability for charged particles.
They allow specific ions to pass through the membrane. Provide selective permeability for charged particles.
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What is the role of the lipid bilayer in facilitated diffusion?
What is the role of the lipid bilayer in facilitated diffusion?
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It acts as a barrier to polar or charged molecules. Prevents direct passage of hydrophilic molecules.
It acts as a barrier to polar or charged molecules. Prevents direct passage of hydrophilic molecules.
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Are there any energy requirements for facilitated diffusion?
Are there any energy requirements for facilitated diffusion?
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No, it is energy-independent. Passive process relying only on concentration gradients.
No, it is energy-independent. Passive process relying only on concentration gradients.
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Do carrier proteins require ATP to function?
Do carrier proteins require ATP to function?
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No, not in facilitated diffusion. Facilitated diffusion is energy-independent.
No, not in facilitated diffusion. Facilitated diffusion is energy-independent.
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What is the key structural feature of channel proteins?
What is the key structural feature of channel proteins?
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They form pores in the membrane. Creates selective pathways through membrane structure.
They form pores in the membrane. Creates selective pathways through membrane structure.
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Identify one similarity between facilitated diffusion and osmosis.
Identify one similarity between facilitated diffusion and osmosis.
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Both are passive transport processes. Both use concentration gradients without energy input.
Both are passive transport processes. Both use concentration gradients without energy input.
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Identify one condition that could inhibit facilitated diffusion.
Identify one condition that could inhibit facilitated diffusion.
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Protein inhibitors or low temperatures. Factors that reduce protein function or molecular motion.
Protein inhibitors or low temperatures. Factors that reduce protein function or molecular motion.
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What is the role of facilitated diffusion in cellular respiration?
What is the role of facilitated diffusion in cellular respiration?
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Transport of glucose into cells. Provides substrate for energy production pathways.
Transport of glucose into cells. Provides substrate for energy production pathways.
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What is the role of glucose transporters?
What is the role of glucose transporters?
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They facilitate glucose transport across the membrane. Essential for cellular energy metabolism.
They facilitate glucose transport across the membrane. Essential for cellular energy metabolism.
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Does facilitated diffusion involve a change in protein shape?
Does facilitated diffusion involve a change in protein shape?
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Yes, in carrier proteins. Conformational changes enable molecular transport.
Yes, in carrier proteins. Conformational changes enable molecular transport.
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Identify a scenario where facilitated diffusion is vital.
Identify a scenario where facilitated diffusion is vital.
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Nerve impulse transmission. Requires rapid ion movement for electrical signals.
Nerve impulse transmission. Requires rapid ion movement for electrical signals.
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Which molecules are transported by ion channels?
Which molecules are transported by ion channels?
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Ions such as Na$^+$, K$^+$, Ca$^{2+}$. Charged particles that require channel proteins.
Ions such as Na$^+$, K$^+$, Ca$^{2+}$. Charged particles that require channel proteins.
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What is the function of gated channels?
What is the function of gated channels?
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They open or close in response to stimuli. Control molecular flow through stimulus-response mechanisms.
They open or close in response to stimuli. Control molecular flow through stimulus-response mechanisms.
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Identify one example of a molecule that uses facilitated diffusion.
Identify one example of a molecule that uses facilitated diffusion.
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Glucose. Large polar molecule requiring carrier protein assistance.
Glucose. Large polar molecule requiring carrier protein assistance.
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What is the concentration gradient?
What is the concentration gradient?
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Difference in concentration across a space. Drives passive transport from high to low concentration.
Difference in concentration across a space. Drives passive transport from high to low concentration.
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Can facilitated diffusion become saturated?
Can facilitated diffusion become saturated?
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Yes, when all proteins are occupied. Limited number of proteins creates maximum transport rate.
Yes, when all proteins are occupied. Limited number of proteins creates maximum transport rate.
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Does facilitated diffusion require energy?
Does facilitated diffusion require energy?
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No, it is a passive process. Uses existing concentration gradients as driving force.
No, it is a passive process. Uses existing concentration gradients as driving force.
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