Which of the following statements about enzymes is NOT true?

All enzymes have the same shape as their substrates.

Enzymes work best at a specified pH.

The shape of an enzyme allows it to do its job.

Which of the following statements is true about catalysts?

Catalysts lower the activation energy of a chemical reaction.

Catalysts slow down the rate of chemical reactions.

Catalysts are used up during a chemical reaction.

Enzymes affect the reactions in living cells by changing the

products of the reaction. products of the reaction.

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

Excessive heat and changes in pH

Exposure to bacteria and Amoebas

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 .

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.

Cells can only work if their enzymes are functioning. What can you infer from the graph?

Cells do not function well if the pH is too high or too low

Cells function best at low pH values

Cells function fine at all pH values

Cells function best at high pH values

Once an enzyme has helped a reaction take place, it can then

be reused for another reaction with the same reactants.

be stored in the cell until it is needed again.

be used to help different reactants go through a reaction.

Looking at the graph, how would you know which reaction took place with the help of an enzyme?

The peak for the activation energy is lower.

The peak for the activation energy is higher.

There is less energy in the products than the reactants.

There is no way to really tell which line on the graph shows a reaction that takes place with a reaction.

What is activation energy?

The energy it takes to start a reaction

The energy it takes to make an enzyme

The energy it takes for bonds to form between a substrate and an enzyme

The energy it takes to keep the enzyme in its shape

BIO 1B Chemical Reactions & Enzymes Review

Authored by Jenny Beights

Biology

9th - 11th Grade

NGSS covered

Used 211+ times

BIO 1B Chemical Reactions & Enzymes Review

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In chemical reactions, atoms are

created

destroyed

rearranged

neutralized

Tags

NGSS.HS-PS1-7

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

When hydrogen and oxygen combine to form water, water is

a product

a reactant

an enzyme

a catalyst

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Identify the reactant(s) in the chemical reaction, CO₂ + H₂O ---> H₂CO₃

CO₂, H₂O, and H₂CO₃

CO₂ and H₂O

H₂CO₃

CO₂

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the process that changes one set of chemicals into another set of chemicals?

cohesion

hydrogen bonding

chemical reaction

dissolving

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Chemical reactions that release energy

will not occur.

need catalysts to occur.

will always explode.

often occur spontaneously.

Tags

NGSS.HS-PS1-4

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What type of reaction is the one pictured?

Energy absorbing.

Energy releasing.

Tags

NGSS.HS-PS1-4

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What type of reaction is the one pictured?

Energy absorbing.

Energy releasing.

Tags

NGSS.HS-PS1-4

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BIO 1B Chemical Reactions & Enzymes Review

In chemical reactions, atoms are

When hydrogen and oxygen combine to form water, water is

Identify the reactant(s) in the chemical reaction, CO2 + H2O ---> H2CO3

What is the process that changes one set of chemicals into another set of chemicals?

Chemical reactions that release energy

What type of reaction is the one pictured?

What type of reaction is the one pictured?

Which of the following statements about enzymes is NOT true?

Which of the following statements is true about catalysts?

A substance that speeds up the rate of a chemical reaction is called

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Identify the reactant(s) in the chemical reaction, CO₂ + H₂O ---> H₂CO₃