Enzymes RT

All of the following are correct about enzymes EXCEPT

• Enzymes are organic catalysts

• Enzymes lower the energy of activation

• Enzymes are assisted by cofactors

• Enzymes are affected by changes in temperature but not changes in pH

• Enzymes are larger than the substrates they work on

Enzymes function because of their particular shape or conformation. Which level of protein structure is most directly responsible for the shape of a protein?

• Primary

• Secondary

• Tertiary

• Quaternary

• Cannot be determined

If the non-protein part is covalently bonded to an enzyme, it is knows as:

• Activator

• Prosthetic group

• Coenzyme

• Apo-enzyme

The charge and shape of the active site is formed by:

• Cofactor

• Amino acids

• Allosteric site

• Globular shape

Enzymes are basically or all enzymes contain

• Sugars

• Proteins

• Fats

• Vitamins

Who is credited with proposing 'Lock and Key' theory?

• Koshland

• Buchner

• Emil Fischer

• Summer

The conversion of complex food into simpler and soluble substances by the action of enzymes is

• Assimilation

• Ingestion

• Digestion

• Translocation

Blocking of active site of an enzyme temporarily is a kind of:

• Competitive inhibition

• Non-competitive inhibition

• Feedback inhibition

• Non reversible

Vitamins are essential for the body because:

• They are part of some enzyme

• Prosthetic groups of enzymes are synthesized from them

• Co enzyme of enzyme is synthesized from them

• Some activators have direct link with them

Any factor that can alter the chemistry and shape of an enzyme can affect its rate of:

• Activity

• Hydrolysis

• Catalysis

• Photolysis