STAAR Biology Enzymes

Enzymes are composed of which macromolecule.

• lipids
• protein

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?
Enzymes work best at an optimal temperature.

• The enzymes will lose their bond structure and fall apart
• The enzymes will not increase the rate of reactions as much as they would at 70 °C. 

What is the relationship between enzymes and activation energy? 

• When an enzyme catalyzes a reaction, it decreases the activation energy of the reaction.
• When an enzyme catalyzes a reaction, it does not affect the activation energy of the reaction.

Tags

NGSS.HS-PS1-5

Meat tenderizer contains an enzyme that breaks down meat. If meat is coated with tenderizer and then placed in a refrigerator, how would the enzyme be affected? Temperature can effect how an enzyme works

• It would break down the meat more slowly
• It would change the shape of the meat.

If the enzyme has a pH ranging from 7 to 9 what effect would a pH of 3 have on the enzyme?
Enzymes work best at an optimal temperature and pH

• make it inactive
• no change

Tags

NGSS.HS-PS1-2

The graph shows how the activity of an enzyme changes over a range of pH values. Which of the following conclusions can be drawn from this graph?

• pepsin works best at a pH near 2
• pepsin works best at a pH of 9

The diagram below illustrates a biochemical process that occurs in organisms. What is another name for the substance labeled "catalyst"? 

• Enzyme
• Antibody

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? 

• The body is kept relatively warm to prevent too much enzyme action
• Enzymes function best at a specific temperature.

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

• The reactions are too slow to meet the needs of the cell if enzymes are missing.
• The reactions take up too much space in the cell if the enzymes are missing.

Enzymes interact with the substrate at the 

• active site
• product