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Effect of [Substrate] and [Enzyme] on Km and Vmax?

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This is in relation to the AAMC Sample B/B Q24 that asks "If the concentration of the transporter protein is increased, the transport affinity of L-alanine will:"
The answer is "Not change" as increasing the concentration of enzyme has no effect on Km (affinity).

So [enzyme] has no effect on Km, but it does change the Vmax right? proportionally I'm assuming?
What about [substrate]? How does it affect Km and Vmax?

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