Enzymes review

An enzyme catalyzes a reaction meaning...

• it speeds up the reaction by raising the activation energy

• it speeds up the reaction by lowering the activation energy

• it slows down the reaction by raising the activation energy

• it slows down the reaction by lowering the activation energy

An enzyme is an example of this macromolecule ______

All of the following are characteristics of an enzyme EXCEPT:

• they are reusable

• they can only be used once

• they are specific

• they are catalysts

Using this picture identify what step in the reaction this enzyme is at?

• The substrate is trying to find an enzyme to bind to

• The enzyme is releasing the new products of the reaction

• The substrate is breaking down the enzyme in the reaction

• The substrate is binding to the enzyme

What is structure A?

• Substrate
• Active site
• Enzyme
• Products

What is structure D?

• Substrate
• Active site
• Enzyme
• Products

What is structure C?

• Substrate
• Active site
• Enzyme
• Products

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 .
  

Which of these is NOT true?

• Enzymes can denature (change shape) when the temperature gets too high.
• Enzymes can only be used once in a chemical reaction. 
• Extreme pH can denature enzymes.
• Enzymes speed up chemical reactions. 

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