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What type of molecules can move freely across the cytoplasmic membrane of bacterial cells?
What type of molecules can move freely across the cytoplasmic membrane of bacterial cells?
- Small uncharged, non-polar molecules (correct)
- Highly reactive molecules
- Polar molecules
- Large charged molecules
What is the net movement of a chemical down its concentration gradient called?
What is the net movement of a chemical down its concentration gradient called?
- Facilitated diffusion
- Active transport
- Osmosis
- Diffusion (correct)
Which type of transport requires energy for molecules to enter the bacterial cell?
Which type of transport requires energy for molecules to enter the bacterial cell?
- Facilitated diffusion
- Active transport (correct)
- Simple diffusion
- Passive transport
What type of molecules is the cytoplasmic membrane essentially impermeable to?
What type of molecules is the cytoplasmic membrane essentially impermeable to?
What is the main source of potential energy for diffusion?
What is the main source of potential energy for diffusion?
What represents the diffusion of water through a selectively permeable membrane along its concentration gradient?
What represents the diffusion of water through a selectively permeable membrane along its concentration gradient?
Which type of transport allows the diffusion of molecules across the membrane via a membrane protein that acts as a channel?
Which type of transport allows the diffusion of molecules across the membrane via a membrane protein that acts as a channel?
What provides the energy for transporting a molecule against its concentration gradient in active transport?
What provides the energy for transporting a molecule against its concentration gradient in active transport?
What type of transport uses the energy stored in chemical gradients, often the proton motive force, to power the transport of a different molecule against its gradient?
What type of transport uses the energy stored in chemical gradients, often the proton motive force, to power the transport of a different molecule against its gradient?
What is the main function of a sodium-proton antiporter?
What is the main function of a sodium-proton antiporter?
What is the purpose of the Lac permease symporter?
What is the purpose of the Lac permease symporter?
What happens to the transported substance in group translocation?
What happens to the transported substance in group translocation?
What powers the transport of substances across the cytoplasmic membrane in ATP binding cassette (ABC) transporters?
What powers the transport of substances across the cytoplasmic membrane in ATP binding cassette (ABC) transporters?
Where are prokaryotic ABC transporters best studied?
Where are prokaryotic ABC transporters best studied?
What type of protein binds vitamin B12 with high affinity and transports it across the outer membrane using energy from the TonB complex?
What type of protein binds vitamin B12 with high affinity and transports it across the outer membrane using energy from the TonB complex?
What is the classic example of group translocation?
What is the classic example of group translocation?
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