Enzymes 22-23

Multiple Choice

Why are enzymes important?

• They help biochemical reactions occur.

• The help you stay cold.

• They do photosynthesis.

• They do cellular respiration.

Multiple Choice

Which of the following is NOT a function of proteins?

• Transport oxygen.

• Provide structural support.

• Store genetic information.

• Regulate body metabolism.

Multiple Choice

What do catalysts do?

• Speed up chemical reactions

• Slow down chemical reactions

• Add more substrates to a chemical reaction

• Add more products to a chemical reaction

Multiple Choice

Look at the graph. It shows the progress of a chemical reaction with and without an enzyme.

Which of the following best describes how the enzyme affects the reaction?

• The enzyme raises the amount of activation energy required for the reaction to proceed.

• The enzyme lowers the amount of the activation energy required for the reaction to proceed.

• The enzyme has no effect on the amount of the activation energy the reaction requires to proceed.

• The enzyme releases the activation energy required for the reaction to proceed.

Multiple Choice

Can enzymes be reused?

• Yes

• No

Multiple Choice

How do Enzymes catalyze reactions?

• They increase the activation energy

• They slow down reactions

• They decrease the activation energy

• They add substrates to the reaction

Multiple Choice

Enzymes are efficient and highly specific proteins. In fact, living organisms would not exist without enzymes because the chemical reactions required by living organisms simply would not occur fast enough.

Which of the following is a true statement about enzymes?

• Enzymes can be reused after a chemical reaction is complete.

• Enzymes raise the activation energy of chemical reactions.

• Temperature and pH do not affect enzyme activity.

• The shape of the substrate does not affect enzyme activity.

Multiple Choice

The _____________ is the Lock and the ____________ is the Key

• Substrate, Enzyme

• Substrate. Product

• Enzyme, Product

• Product, Enzyme

Multiple Choice

Enzymes bind their ___________ at the Active site

• Substrate

• Catalysis

• Product

• Activation Energy

Multiple Choice

After the chemical reaction has occurred the enzyme releases the _____________

• Product

• Substrate

• Catalyse

• Activation Energy

Multiple Choice

Look at the enzyme reaction diagram.

Which of the following statements best describes how an enzyme reaction works?

• Enzymes are living organisms with specific shapes that bond to proteins with the same shape.

• Enzymes are proteins that bind to other proteins in the cell in order to release stored energy.

• Enzymes are proteins with specific shapes that allow the enzyme to speed up chemical reactions to break apart or combine molecules in a cell.

• Enzymes are living organisms that seek out molecules in the cell to break down bonds and speed up reactions.

Multiple Choice

What occurs when and enzyme denatures?

• The shape changes and it can no longer bind the substrate

• It becomes better at binding the substrate

Multiple Choice

Look at the graph.  It shows the rate of reaction for an enzyme found in the human body.

When body temperature is lower than the average normal body temperature of 37°C, how is the reaction rate for an enzyme affected?

• Enzyme reaction rate is lower.

• Enzyme reaction rate is higher.

• Enzyme reaction rate does not change.

• Enzyme reaction rate increases and then decreases.

Multiple Choice

Enzymes are used as catalysts for chemical reactions.

Which of the following steps must occur first in order for an enzyme to be used as a catalyst in a reaction?

• The enzyme must join with the substrate involved in the reaction.

• The enzyme must break down the cell wall in order to enter the cell.

• The enzyme must raise the amount of activation energy needed for the reaction.

• The enzyme must create additional ATP molecules to be used for energy during the reaction.

Multiple Choice

In an enzymatic pathway if an enzyme is denatured

• The product of that enzyme will build up

• The substrate for that enzyme will build up

• The pathway will run as normal