What is the relationship between substrate amount and rate of reaction?

Question

I am not asking about how increasing the substrate amoung speeds up the reaction caused by an enzyme, until saturation of active site is reached and rate of reaction is the same. In the first part, when the rate is linear, going upward, and Im comparing different rates of different substrate amounts. So I have a graph with rate of reaction in different substrates. should that be linear? thank you

Answer 1

For this kind of reaction, you usually get a sigmoid shaped graph, with a lag phase, when it takes a while for the reactions to get started, then a log phase, where it occurs very quickly, then it flattens off when most of the substrate has been broken down. Sometimes the middle portion is approximately linear.