Review

The graph shows how enzymes affect reactions in cells. Which statement best summarizes the information shown in the graph?

• Enzymes increase the energy of the reactants.
• Enzymes decrease the energy level of the products.
• Enzyme decrease the activation energy of the reaction.
• Enzymes reverse the direction of the reaction.

Tags

NGSS.HS-PS1-4

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 .
  

Tags

NGSS.MS-PS1-2

Enzymes are...

• nucleic acids
• proteins
• lipids
• carbohydrates

Tags

NGSS.MS-LS1-7

An enzyme speeds up a chemical reaction in the cell but can only be used once.  True or False? 

• true
• false

What happens when enzymes are heated to a high temperature?

• The enzymes die.
• The shapes of the enzyme are altered denature
• The enzymes' amino acid sequence changes.
• The enzymes remain the same

Enzymes speed up reaction rates by changing...

• Activation Energy
• pH
• Hydrogen Bonds
• Kinetic Energy

Tags

NGSS.HS-PS1-5

What factors affect an enzyme's reaction rate?

• temperature 
• pH
• neither pH nor temperature
• both pH and temperature

What is indicated by letter A?

• enzyme
• product
• substrate
• active site

Lactose intolerance is most likely caused by -

• A lack of lactase enzyme to breakdown lactose
• Overproduction of glucose and galactose
• Excess lactase enzyme
• A lack of lactose sugar

Tags

NGSS.MS-LS1-7

Any substance that speeds up a chemical reaction is called a ________?

• reusable
• catalyst
• specific
• fragile