In the lock and key model of enzyme action the fits into the of the enzyme

The correct answer is C) substrate; active site.

The other options of the question were A) product; substrate. B) active site: product. D) active site; substrate.

In the Lock and Key model of enzyme action, the substrate fits into the active site of the enzyme.

It was scientist Emil Fisher in 1874 who proposed this comparison in which an enzyme is the lock enters the substrate is the key.  Fisher established that the appropriate key or substrate was going to fit in the correct hole or active site. This active site has to have a specific geometric shape to fit.

it´s related to his charming character.

beauty is not everything, although we can joke that girls only care about the physical or material aspect, the truth is that a real woman looks at more important things, besides intelligence and personality, there are other attitudes that make irresistible to men who are 'unattractive'.

for example develop your sense of humor.