Enzymes

How do enzymes speed up chemical reaction?

• Increasing activation energy

• Decreasing activation energy

• Increasing deactivation energy

• Decreasing deactivation energy

What is a substance called if it speeds up a chemical reaction?

• reusable
• catalyst
• specific
• fragile

Each enzyme only has 1 substrate that will fit its active site.  What is this called?

• reusablility
• denaturation
• specificity
• fragility

The human stomach has a pH of about 3 and contains many enzymes to help digest food. Other parts of the digestive tract, such as the small intestine, have a higher pH. Pepsin and trypsin are two enzymes that help to digest proteins. A graph of the enzyme activity is shown below.

Which enzyme is most likely found in the stomach and why?

• Pepsin, because the lowest activity level is at a pH of 3

• Trypsin, because the lowest activity level is at a pH of 4.

• Pepsin, because the highest activity level is at a pH of 3.

• Trypsin, because the highest activity level is at a pH of 8.

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.MS-PS1-2

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

Any substance that is acted upon by an enzyme is called a(n)?

• Coenzyme
• Substrate
• Vitamin
• Polypeptide

Tags

NGSS.MS-LS1-7

Based on the graph, what is the optimal temperature for this enzyme? 

• 15^oC
• 40^oC
• 30^oC
• 35^oC

Tags

NGSS.MS-PS1-4

In the diagram, what is letter A? 

• product
• substrate
• enzyme-substrate complex
• active site

Enzymes are...

• nucleic acids
• proteins
• lipids
• carbohydrates

Tags

NGSS.MS-LS1-7