Wed 1/6: Enzymes

Last updated about 5 years ago

13 questions

1

3

1

Various enzymes in our bodies are:

Lipids

Carbohydrates

Nucleotides

Proteins

Has an active site which only fits substrates with a particular shape.

Can only make ionic bonds.

Cannot change shape.

Becomes denatured when it is heated.

Extreme temperature change

Change in pH

Addition of substrates

Both A and B are correct

endothermic

exothermic

Use the following graph to answer #19 below:

20℃

32℃

45℃

60℃

endothermic

activation energy

exothermic

endothermic reaction

activation energy

exothermic reaction

D

Figure 8.16a

1

The enzyme is causing new bonds to form between the substrate

The substrates are beginning to bind to the enzyme

The active sites are restructuring the enzyme.

The catalyzed reaction is releasing a product.

By making it hotter. 

By lowering the activation energy. 

By increasing the activation energy. 

By binding to a substrate and allowing the chemical reaction to skip step 2. 

Red line

Black line

Various enzymes in our bodies are:

Lipids

Carbohydrates

Nucleotides

Proteins

Enzymes only work with specific substrates because each enzyme:

Has an active site which only fits substrates with a particular shape.

Can only make ionic bonds.

Cannot change shape.

Becomes denatured when it is heated.

Structural changes in an enzyme can affect its ability to function correctly. This denaturation can occur as a result of _______________.

Extreme temperature change

Change in pH

Addition of substrates

Both A and B are correct

Is the following graph a depiction of an endothermic or exothermic reaction? 

endothermic

exothermic

What is the optimal temperature for this enzyme?

20℃

32℃

45℃

60℃

This type of reaction releases energy

endothermic

activation energy

exothermic

This type of reaction absorbs energy

endothermic reaction

activation energy

exothermic reaction

D

In the lock and key model of of enzyme function shown above, what is happening in step 2?

The enzyme is causing new bonds to form between the substrate

The substrates are beginning to bind to the enzyme

The active sites are restructuring the enzyme.

The catalyzed reaction is releasing a product.

What point on the graph represents the activation energy? 

A

B

C

D

E

How do enzymes speed up a chemical reaction?

By making it hotter. 

By lowering the activation energy. 

By increasing the activation energy. 

By binding to a substrate and allowing the chemical reaction to skip step 2. 

Which line on the graph represents the reaction with an enzyme? 

Red line

Black line