Question

The following statements about enzymes are true, except:
a. they are proteins tbat speed up chemical reactions.
b. they are often consumed or destroyed in the reaction.
c. the active site is the location of the chemical reaction.
d. their function can be affected by salt concentration or pH

Answer 1

a. enzymws are Proteins that speed up chemical reaction.

Explaination- enzymes are built of proteins folded into complicated shapes that speed up (catalyze) chemical reaction millions of times.

b. They ar often consumed or destroyed in the reaction.

Option c. justify option b. Is incorrect. Enzyme does not consume or destroyed in the reaction enzyme makes product from substrate once the product is ready it leaves active site and enzyme is ready to make new product from substrate.

Eg - lock and key theory

c. The Active site is the location of chemical reaction.

Explaination- substrate binds to the active site ( location of chemical reaction) of an enzyme and chemical reaction starts and substrate is converted into a product once the product leaves the active site enzyme is ready to attach to a new substrate and repeat the process.

d. Their function affected by salt concentration or pH

Explaination-enzymes only function in the certain pH range ( acidic/alkaline) in the body

Example- enzymes in the intestine (pH 7.5) works best

Enzymes in the stomach (pH 2) works best

Hence the preference depends on where they are found in the body.

If the environment is too acidic or too alkaline enzyme changes shape and this will alter shape of the active site and because of this substrate cannot bind to it and enzyme became denatured.

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