9 questions on "Microbial Metabolism - Transporting Nutrients into the Cell"

What is active transport?
The process by which cells accumulate solutes againt the concentration gradient.
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What are the three major classes of transport systems in prokaryotes?
  • Simple transport
  • Group translocation
  • ABC transporting systems
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Of which three componets consists the ABC transport system?
  1. Substrate-binding protein
  2. Transmembrane transporter
  3. ATP-hydrolizing protein
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What is the name of the reaction where a solute and a proton are cotransported in one direction?
Symport reaction
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What is the name of the reaction where a solute and a proton are transported in opposite directions?
Antiport reaction
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In which ways does group translocation differ from a simple transport reaction?
  1. The transported substance is chemically modified during the transport process.
  2. An energy-rich organic compound drives the transport event.
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What does the phosphotransferase system do?
Transport any given sugar
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Which protein catalyzes the transport of substrates in gram-negative bacteria?
Periplasmic binding protein
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What is the functional equivalent of periplasmic binding proteins in gram-positive bacteria?
Substrate-binding proteins
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