Enzyme molecules react with reactants to produce substrate molecules. true false

This statement is false.
Reason:
Enzymes are the biological catalyst that can speed up the rate of reaction with out undergoing any change. When an enzyme react with reactant (substrate) they form enzyme substrate complex. At this time enzyme reduce the activation energy and converts substrate to product.

The proton has a positive charge while the neutron has no charge they both make up the nucleus of the atom while the elections have a negative charge and surround the nucleus of the atom. the protons and electrons are used to calculate the atom's mass whereas the neutrons don't affect the mass