4 - Enzyme - Assessment

1.

Multiple Choice

1 min

1 pt

Enzymes will make a reaction go _______ and use ______ energy.

faster, less

faster, more

slower, less

slower, more

2.

Multiple Choice

30 sec

1 pt

Which of the following tasks listed below is most associated with enzymes?

catalyze chemical reactions

store genetic information

store chemical energy in the cell

dissolve nutrients and minerals

3.

Multiple Choice

45 sec

1 pt

Enzymes are capable of increasing the rate of a chemical reaction within a living cell. Enzymes accomplish this through which of the following means?

reducing the number of products

reducing the activation energy

increasing the temperature of the cell

increasing the concentration of reactants

4.

Multiple Choice

45 sec

1 pt

Cells can produce over one thousand different enzymes at a time. Enzymes are critical to the metabolism of these cells, but why are so many different enzymes needed?

Cells are completely unable to control what enzymes they produce

The variety of enzymes prevents their actions from being inhibited.

The active site of an enzyme can only bind to a specific substrate.

The products of a reaction are always converted into new enzymes.

5.

Multiple Choice

30 sec

1 pt

Which factors can change the shape of an enzyme and thus denatures a enzyme?

Excessive heat and changes in pH

Nothing can

Exposure to light and sound

Exposure to bacteria and Amoebas

6.

Multiple Choice

20 sec

1 pt

Enzymes are composed of what organic molecule?

Sugars

DNA

Proteins

Fatty Acids

7.

Multiple Choice

1 min

1 pt

What happens to an enzyme when it is denatured?

Activation energy is lowered.

It becomes stronger.

It loses its shape.

Activation energy is raised.

8.

Multiple Choice

1 min

1 pt

Every enzyme has a optimal temperature and pH. True or False?

True

False

9.

Multiple Choice

30 sec

1 pt

Enzymes influence chemical reactions in living systems by:

Providing the substrate required for the reaction to occur.

Lowering the activation energy thus affecting the rate at which reactions occur.

Absorbing water released when polymers are formed.

Combining with excess hydrogen to from gaseous wastes.

10.

Multiple Choice

1 min

1 pt

The "lock and key hypothesis" attempts to explain the mechanism of?

Vacuole formation

Pinocytosis

Sharing of electrons

Enzyme are specific to a substrate

11.

Multiple Choice

20 sec

1 pt

Any substance that is acted upon by an enzyme is called a(n)?

Coenzyme

Substrate

Vitamin

Polypeptide

12.

Multiple Choice

45 sec

1 pt

Based on the graph, what temperature does this enzyme work best?

15 C

40 C

30 C

13.

Multiple Choice

30 sec

1 pt

In the diagram, what is letter A?

product

substrate

enzyme-substrate complex

active site

14.

Multiple Choice

30 sec

1 pt

Which line represents an enzyme-catalyzed reaction?

Line 1

Line 2

15.

Multiple Choice

30 sec

1 pt

In a chemical reaction, a reactant binds to an enzyme at a region known as the

catalyst.

product.

substrate.

active site.

16.

Multiple Choice

30 sec

1 pt

Significantly changing the pH the enzyme is exposed to will cause the enzyme to _____________.

increase enzymatic action

fit better with the substrate

denature

evaporate

17.

Multiple Choice

30 sec

1 pt

Enzymes need to be manufactured often because they are used up in the chemical reactions they perform. (True / False)

True

False

18.

Multiple Choice

30 sec

1 pt

Enzymes are proteins and are therefore made of which of the following monomers

nucleic acids

monosaccharides

amino acids

fatty acids

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