Enzyme

Enzyme

Chapter 5

Multiple Choice

How many biological molecules have you studied in the previous chapter?

• 3

• 4

• 5

• 6

Multiple Select

What are the biological molecules you have studied in the previous chapter?

• lipid

• protein

• iodine

• carbohydrate

• DNA

Multiple Choice

The biological molecule with nitrogen content is ... .

• carbohydrate

• lipid

• protein

• sugar

Multiple Choice

The biological molecule with nitrogen content is ... .

• carbohydrate

• lipid

• protein

• sugar

Multiple Choice

Catalyst is ... .

• a protein which speeds up a reaction.

• produced only by living organisms

• killed in high temperature

• not involved in a reaction

Multiple Choice

Enzyme ...

• works only inside a living cell

• produced continuously in our body

• killed by extreme pH

• is often called biocatalyst

Multiple Choice

The enzyme that works on protein is called ... .

• proteinase

• protease

• protase

• prase

Multiple Choice

The enzyme that works on sucrose is called ... .

• sucroase

• sucrose

• sucrase

• sucronase

Lock and Key Mechanism

• In the lock and key hypothesis, the shape of the active site matches the shape of its substrate molecules.

• This makes enzymes highly specific.

• Each type of enzyme can usually catalyse only one type of reaction (some may catalyse a few types of reactions).

Lock and Key Mechanism

The diagram shows how this works. In this example, the enzyme splits one molecule into two smaller ones.

Multiple Choice

Which molecule would most likely react with the enzyme?

• A

• B

• C

• D

Multiple Choice

What is being represented by the letter A in the image?

• Substrate

• Enzyme

• Product

• Complex

Multiple Choice

Letter E...

• active site

• enzyme

• substrate

• products

Multiple Choice

Letter C...

• active site

• enzymes

• substrate

• products

Multiple Choice

What is being represented by the letter B in the image?

• Substrate

• Enzyme

• Substrate

• Product

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Multiple Choice

The graph shows the relative rates of action of four enzymes, A, B, C, and D. Which enzyme shows the greatest change in its rate of action with the least change in pH?

• enzyme A

• enzyme B

• enzyme C

• enzyme D

Multiple Choice

What is the optimal pH of enzyme A?

• 8

• 2

• 5.7-10

• 10

Multiple Choice

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

• 15^oC

• 40^oC

• 30^oC

• 35^oC

Multiple Choice

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 .
  

Multiple Choice

If an enzyme becomes over heated what effect, if any, will the heat have on the enzymatic activity?

• The enzyme will not store much chemical energy.

• The enzyme will not be able to catalyze reactions.

• The enzyme will lose its net electrical charge.

• The enzyme will lose stored genetic information.