Wed 1/6: Enzymes

Last updated almost 5 years ago

13 questions

Library

Wed 1/6: Enzymes

Last updated almost 5 years ago

13 questions

Question 1

Various enzymes in our bodies are:

Lipids

Carbohydrates

Nucleotides

Proteins

Question 2

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.

Question 3

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

Question 4

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

endothermic

exothermic

Use the following graph to answer #19 below:

Question 5

What is the optimal temperature for this enzyme?

20℃

32℃

45℃

60℃

Question 6

Label the parts of this diagram showing the catalyzed reaction breaking down hydrogen peroxide into water and oxygen using the terms (A) enzyme, (B) substrate, and (C) products.

Question 7

This type of reaction releases energy

endothermic

activation energy

exothermic

Question 8

This type of reaction absorbs energy

endothermic reaction

activation energy

exothermic reaction

D

Figure 8.16a

Question 9

At what temperature do BOTH the human enzyme and thermophilic enzyme have some function? Write the numerical value only.

Question 10

10.

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.

Question 11

11.

What point on the graph represents the activation energy?

A

B

C

D

E

Question 12

12.

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. 

Question 13

13.

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

Red line

Black line