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Questions and Answers
What is the main function of carrier proteins in facilitated diffusion?
What is the main function of carrier proteins in facilitated diffusion?
- Provide a direct passageway for specific molecules
- Facilitate movement of molecules against their concentration gradient
- Act as channels for molecules to pass through
- Bind specific solute and undergo conformational changes (correct)
In facilitated diffusion, what happens when the concentration gradient dissipates?
In facilitated diffusion, what happens when the concentration gradient dissipates?
- The passage of molecules into the cell stops (correct)
- Molecules start moving out of the cell
- Molecules continue to enter the cell regardless
- The carrier proteins change shape
How do channel proteins differ from carrier proteins?
How do channel proteins differ from carrier proteins?
- They bind specific solutes and undergo conformational changes
- They require energy input for molecule transport
- They move molecules against their concentration gradient
- They facilitate passive diffusion of molecules (correct)
Which statement is true about active transport?
Which statement is true about active transport?
What distinguishes primary active transport from facilitated diffusion?
What distinguishes primary active transport from facilitated diffusion?
In secondary active transport, what is the role of carrier proteins?
In secondary active transport, what is the role of carrier proteins?
What distinguishes active transport from facilitated diffusion?
What distinguishes active transport from facilitated diffusion?
What type of transport is characterized by carriers called primary active transporters?
What type of transport is characterized by carriers called primary active transporters?
What is the distinguishing feature of primary active transporters in terms of the molecules they move?
What is the distinguishing feature of primary active transporters in terms of the molecules they move?
How does secondary active transport differ from primary active transport?
How does secondary active transport differ from primary active transport?
Which statement best describes cotransporters in secondary active transport?
Which statement best describes cotransporters in secondary active transport?
What type of carrier proteins can be either uniporters or cotransporters?
What type of carrier proteins can be either uniporters or cotransporters?
What is the defining characteristic of symporter proteins in secondary active transport?
What is the defining characteristic of symporter proteins in secondary active transport?
What distinguishes uniporters from cotransporters in terms of the substances they move across the membrane?
What distinguishes uniporters from cotransporters in terms of the substances they move across the membrane?
Which type of transporter moves an ion and another substance in opposite directions?
Which type of transporter moves an ion and another substance in opposite directions?
In group translocation active transport, what is chemically modified as it is brought into the cell?
In group translocation active transport, what is chemically modified as it is brought into the cell?
What is the distinguishing feature of the Sugar phosphotransferase system (PTS) regarding active transport?
What is the distinguishing feature of the Sugar phosphotransferase system (PTS) regarding active transport?
Why is iron uptake by siderophores essential for microbes?
Why is iron uptake by siderophores essential for microbes?
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