BIOL1406 Week 5 Exercise

Substrates are held in the active site of an enzyme by:

hydrogen and ionic bonds.

The location on an enzyme that binds substrate is its:

active site.

Hydrogen peroxide (H2O2) is a toxic byproduct of aerobic respiration in cells. The reaction shown helps prevent hydrogen peroxide buildup in cells.

2H2O2 -> 2H2O + O2

In this reaction, catalase (above the yield arrow) functions as an:

enzyme in the breakdown of hydrogen peroxide.

How does an enzyme catalyze a reaction?

by decreasing the energy of activation for a chemical reaction

Cells must produce many different enzymes because:

most cellular reactions require a specific, unique enzyme.

What happens to an enzyme when it denatures?

loss of three dimensional shape of the molecule

Names of enzymes typically end with:

-ase.

Which of the following enzymes would be important in fat digestion?

lipase

Which of the following statements regarding enzymes is true?

Enzymes increase the rate of reaction.

Which of the following explains the concept of saturation?

All of the active sites of the enzymes are occupied.

The inactive form of an enzyme is a(n):

zymogen

In the degradation of maltose to two glucose molecules:

maltose is the subtrate.

The organic nonprotein portion of an enzyme that is required for proper function is a(n):

coenzyme.

Which of the following activities would result in an increase the rate of a chemical reaction?

adding a catalyst

When guaiacol reacts with peroxide and peroxidase, it is ______________ to tetraguaiacol, resulting in the formation of a color compound that can be detected spectrophotometrically.

oxidized

Control of enzyme activity is an important aspect of regulating cell metabolism. Which of the following is LEAST likely to be a mechanism of controlling enzyme activity?

denaturation

If the substrate concentration is limiting, how does increasing enzyme concentration affect reaction rate?

Increasing enzyme concentration has no effect on reaction rate.

The experimental setup for your lab involved the extraction of an enzyme from turnip, and observing its reaction rate under a variety of conditions. What is the enzyme?

peroxidase

Vitamins are essential to the survival of organisms because vitamins usually function as:

coenzymes.

need to add

questions from excersise 5