Biocatalysis Quiz

The molecules that carry out most of the catalysis in living organisms are called

• substrates

• enzymes

• reaction

• coenzymes

Enzyme affect the speed of chemical reaction without being consumed, they are referred to as

• hydrogen acceptor

• biocatalyst

• activation energy

• cytochrome

Enzyme action is specific due to the

• presence of coenzyme

• specific active site

• presence of hydrogen bonds

• large globular protein

Which are true about active site of an enzyme?

• I and II only

• I and III only

• II and III only

• I, II and III

Which of the following best describes the model of the above diagram?

• Michaelis-Menten Kinetics Model

• Lock and Key Model

• Transition State Model

• Induce fit model

There are several enzyme reaction models, which is best describing model show above?

• A mechanism where the enzyme alternately binds two substrates, forming two products before releasing both.

• The rate of enzymatic reactions based on substrate concentration, providing insights into enzyme efficiency.

• Suggests that the enzyme's active site has a specific shape that perfectly fits the substrate, like a lock and key.

• Proposes that the enzyme undergoes conformational changes upon binding with the substrate, resulting in a more complementary fit.

Which of the following is a coenzyme?

• Zinc

• Haem

• Iodine

• NAD+

Which of the following is the example of a metal ion activator and a coenzyme?

• Fe2+ NAD+

• NAD+ Fe2+

• Fe2+ Mn2+

• NAD+ Mn2+

Deficiency of a micronutrient, boron, in the soil decrease the rate of enzymatic reactions involved in chlorophyll synthesis in plants. Which is the best to describe the role of boron?

• Coenzyme

• Competitive inhibitor

• Cofactor

• Non-competitive inhibitor

Penicillin blocks the formation of bacterial wall by mimicking substrate for the enzyme transpeptidase. Which is true of penicillin?

• It forms a complex with the substrate

• It binds to allosteric site of the enzyme.

• It blocks the substrate from entering the active site.

• It destroys the three-dimensional configuration of the enzyme.