Glucoses is a molecule that can move across the cell membrane. if the concentration of glucose is higher inside the cell than outside the cell, then what will happen by the process of diffusion

By the process of diffusion, the glucose molecules outside the cell will begin to move through the membrane to inside of the cell because in diffusion, molecules move from high concentration to low concentration.

OR

Glucose molecules will diffuse out of the cell.

enzyme active site and substrate specificity

enzymes bind with chemical reactants called substrates. there may be one or more substrates for each type of enzyme, depending on the particular chemical reaction. in some reactions, a single-reactant substrate is broken down into multiple products