Which of the Following Is NOT True About the Substrate-Binding

question 65

Multiple Choice

Which of the following is NOT true about the substrate-binding protein (SBP) of the ABC transport system?

• A) It floats in the periplasm of Gram-negative cells.
• B) It is tethered to the cell surface in Gram-positive cells.
• C) It binds to the periplasmic face of the channel and releases the solute.
• D) It snags the appropriate solute.
• E) It is required for both the uptake and efflux systems.

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