Ptyalin is a form of amylase in the saliva of humans and some animals that catalyzes the hydrolysis of starch into maltose and dextrin.
In simpler words, ptyalin is an enzyme secreted by the human salivary glands that help in the digestion of carbohydrates.
Ptyalin is a protein found in saliva.
First, chewing, or mastication, of the food occurs, this is where the teeth break down the food into smaller pieces. Then the saliva starts to break down the food into a paste-like substance that can be swallowed.
The enzyme is inactive at this point. New enzyme must be added to regain enzyme activity
in an enzyme-substrate complex, the enzyme acts on the substrate .
An enzyme is a protein
The place where the substrate and the enzyme meet to allow the enzyme to function.
An angiotensin converting enzyme is an enzyme which catalyzes the creation of angiotensin.
enzyme-substrate complex
the lipase enzyme :)
Such an enzyme is called a restriction endonuclease
The binding of an enzyme and a substrate forms an enzyme-substrate complex. It lowers the activation energy of a chemical reaction
An enzyme is one kind of protein that can catalyze a specific reaction whereas a regulatory enzyme is the enzyme which can regulate a series of reaction which undergo in the living organism. So we can say every enzyme is not a regulatory one but the regulatory enzymes are obviously a special kind of enzyme.