Which of these is NOT true?

Enzymes can only be used once in a chemical reaction.

Enzymes can denature (change shape) when the temperature gets too high.

Extreme pH can denature enzymes.

Enzymes speed up chemical reactions.

What happens when enzymes are heated to a high temperature?

The shapes of the enzyme are altered or denatured

The enzymes' amino acid sequence changes.

Which of the following conclusions can be drawn from this graph?

The optimum pH of the enzyme is 6.6.

The optimum pH of the enzyme is 5.8

The enzyme’s activity increases as pH increases 5.0 to 9.0

The enzyme’s activity is greater around pH of 8.0 .

An enzyme speeds up a reaction by

lowering the activation energy.

At high temperatures enzyme activity declines because of:

Dissociation of Ionic Compounds

The graph shows how enzymes affect reactions in cells. Which statement best summarizes the information shown in the graph?

Enzyme decrease the activation energy of the reaction.

Enzymes increase the energy of the reactants.

Enzymes decrease the energy level of the products.

Enzymes reverse the direction of the reaction.

Which of the following are true about enzymes? (Choose all that apply)

Enzymes speed up chemical reactions.

Enzymes react best at a specific temperature.

Enzymes only control ONE type of reaction.

Enzymes are made of fatty acids.

A substance that speeds up a rate of chemical reaction.

Molecules that make enzymes work harder and faster

A substance that slows down a rate of chemical reaction.

The graph shows the effect of temperature on enzyme action. What characteristic do enzymes E 1 , E 2 , and E 3 share?

Their activity is at a low level between 15°C and 25°C.

Their activity increases between 20°C and 30°C.

Their activity is greatest between 5°C and 10°C.

Their activity is at a high level between 30°C and 40°C.

Some bacteria live in hot springs. Their cells contain enzymes that function best at temperatures of 70 °C or higher. At the temperature of 50 °C, how will the enzymes in these bacterial cells most likely be affected?

The enzymes will not increase the rate of reactions as much as they would at 70 °C.

The enzymes will be destroyed by lysosomes

The enzymes will lose their bond structure and fall apart.

The enzymes will require less energy to function than at 70 °C.

Which of the following best explains why enzymes are necessary for many cellular reactions?

The reactions are too slow to meet the needs of the cell if enzymes are missing.

Enzymes supply the oxygen necessary for the reactions

Enzymes change reactants from solid to liquids during the reactions.

The reactions take up too much space in the cell if the enzymes are missing.

What will most likely happen if an appropriate enzyme is added to a chemical reaction?

The reaction rate will increase.

The equilibrium of the reaction will be maintained.

The reaction rate will decrease.

The human body maintains a temperature of around 98.6 degrees at all times. Enzymes are involved in almost every chemical reaction in the body. Which of the following describes the connection between these two statements?

Enzymes function best at a specific temperature.

The body needs to be warm to prevent hypothermia.

The body is kept relatively warm to prevent too much enzyme action.

There is no connection between the two statements.

As food travels through the digestive system, it is exposed to a variety of pH levels. The stomach has a pH of 2 due to the presence of hydrochloric acid (HCl), and the small intestine has a pH ranging from 7 to 9. HCl converts pepsinogen into pepsin, an enzyme that digests proteins in the stomach. Which of the following most likely happens to pepsin as it enters the small intestine?

It's shape changes to engulf large proteins.

It's activity increases to digest more proteins.

Enzymes are made of fatty acids.

Enzymes speed up chemical reactions.

Enzymes react best at a specific temperature.

Enzymes only control ONE type of reaction.

Enzymes Lesson

Authored by Charles Martinez

Biology

9th - 10th Grade

NGSS covered

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137 questions

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MULTIPLE CHOICE QUESTION

45 sec • 1 pt

Enzymes are considered to be

Lipids

Carbohydrate

Protein

Nucleic Acid

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

What is the purpose of an enzyme?

give permission for the reaction

raise activation energy

speed up reactions

control how many reactions occur

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

Where do substrates bind on an enzyme?

voltage-gated channels

surface receptor

calcium channels

active site

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

How do enzymes increase the speed of chemical reactions?

reducing the number of products

reducing the activation energy

increasing the temperature of the cell

increasing the concentration of reactants

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

What is a substance called if it speeds up a chemical reaction?

reusable

catalyst

specific

fragile

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

What is the name for the mechanism of enzyme activity?

Lock and key

jigsaw puzzle

hammer and nail

two hands pattern

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

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

Coenzyme

Substrate

Vitamin

Polypeptide

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Enzymes Lesson

Enzymes are considered to be

What is the purpose of an enzyme?

Where do substrates bind on an enzyme?

How do enzymes increase the speed of chemical reactions?

What is a substance called if it speeds up a chemical reaction?

What is the name for the mechanism of enzyme activity?

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

After the enzyme and substrate bind together and perform the reaction, what does the substrate become?

can a change in pH alter the active site of an enzyme

Which of these is NOT true?

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