Final answer:
Enzyme kinetics within biology, dealing with a change in Km values indicating alterations in enzyme substrate affinity or the presence of effectors.
Step-by-step explanation:
Enzyme kinetics in biology, specifically concerning Km values, which are a measure of the substrate concentration at which the velocity of an enzyme-catalyzed reaction is half its maximum velocity. A change in Km from a control value of 90 to an experiment value of 48 could indicate a change in the enzyme's affinity for its substrate or possibly the presence of an inhibitor or activator in the experimental setup.
Example interpretation
If we see a decrease in the Km value from the control in the experiment (48 compared to 90), it suggests that the enzyme has a higher affinity for the substrate in the experiment than in the control condition. This could be due to various factors such as enzyme modification, different environmental conditions, or the presence of an effector molecule that alters enzyme activity.
In the context of the whole question we see various examples of scientific calculations which relate to different fields, however, our primary focus here is the Biology aspect concerning enzyme kinetics.