Are isotopes always the same element?
Yes
No

yes because Isotopes of any given element all contain the same number of protons, so they have the same atomic number.

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

the answer is b. glad to .