The theory of lock and key.
Where an enzyme specifically works for only one kind of substrate.
Its kinda romantic, becoz in the end u'll always end up with the one who is really meant for u.
So, dont worry peeps!
But, there's another, induced fit theory.
Where an enzyme can work for some kind of substrate, becoz it can change its shape according to the substrate.
Its kinda romantic too, it turns out that u'll always be ur best to suit ur partner.
So, changing for ur love doesnt always mean its bad, okay?:)