Enzymes

Proteins that help to speed up chemical reactions.

Activation energy

The energy needed to start a chemical reaction.

active site

The substrate (such as hydrogen peroxide from our experiment) bonds to a specific area on the enzyme molecule (catalase). This specific area is known as the _________________________.

7

The optimum pH for most human metabolic enzyme catalyzed reactions is __________.

37 degrees Celsius (98.6 degrees Fahrenheit)

The optimum temperature most human metabolic enzyme catalyzed reactions is __________.

hydrogen peroxide

In our lab experiment with catalase and hydrogen peroxide. Which of these two substances represents the substrate?

catalase

In our lab experiment with catalase and hydrogen peroxide. Which of these two substances represents the enzyme?

H2O2-> H2O + O2

Write the chemical reaction (equation) that takes place when hydrogen peroxide comes in contact with catalase:

1. Molecules move faster.
2. The collisions between molecules become more energetic.
2. The number of collisions between molecules increases.

How are chemical reactions affected when temperature is increased?

1. The enzyme might change shape (denature) and not work as well (or at all).
2. The active site of the enzyme may change shape and then the substrate can't bind to it.

Increasing temperature can help speed up enzyme activity... to a point. What might happen if the enzyme gets too warm?

Carbon dioxide concentration

Which of the following variables is LEAST likely to affect an enzymes' activity (an enzymes' rate of reaction)?
1. Temperature
2. pH
3. The enzymes' concentration
4. Carbon dioxide concentration

-ase

Most enzyme names end in:

Exothermic

During the catalase/enzyme lab the test tube warmed up during the reaction. What type of reaction is this?

3. Enzymes take place directly in the reaction and are used up.

Which of the following statements about enzymes is NOT true:
1. Enzymes are proteins
2. Enzymes are biological catalysts
3. Enzymes take place directly in the reaction and are used up.
4. Enzymes help speed up chemical reactions.

Enzyme

Catalase is a specific type of:

Hydrogen peroxide

Catalase is an enzyme that breaks down:

g) all of the above

Catalase is found in:
a) apples
b) kiwi
c) liver
d) potato
e) aardvarks
f) NOVA students
g) all of the above

oxygen

The gas that was released when hydrogen peroxide was exposed to catalase was:

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