IB Enzymes

What is structure D?

• substrate
• active site
• enzyme
• products

Which of the following is NOT a common misconception about enzymes?

• they are reusable
• there are only a few kinds of enzyme that work in our bodies
• an enzyme only facilitates one reaction and then it is broken down and reabsorbed
• enzymes make chemical reactions occur

Letter E is......

• active site
• enzyme
• substrate
• products

Where do substrates bind on an enzyme?

• voltage-gated channels
• surface receptor
• calcium channels
• active site

The diagram shows the series of a reactions that convert lactose into a usable form.
If Enzyme 4 is denatured, the levels of which substance will increase?

• lactose
• galactose
• glucose-1-phosphate
• glucose-6-phosphate

What is the optimal pH of enzyme A?

• pH 8
• pH 2
• pH 5.7 - 10
• pH 10

What is structure A?

• substrate
• active site
• enzyme
• products

Why does enzyme activity decrease when it is in solution that has either a too high or too low pH?

• All enzymes only work in neutral solutions
• Enzyme activity remains unchanged in different pH's
• The shape of the active site changes
• The shape of the substrate changes

Which of the following conclusions can be drawn from this graph?

• The optimum pH of the enzyme is pH 6.6.
  
• The optimum pH of the enzyme is pH 5.8
  
• The enzyme’s activity increases as pH increases pH 5.0 to 9.0
  
• The enzyme’s activity is greater around pH of 8.0 .
  

An enzyme helps break down a polypeptide chain - what are the resulting monomers?

• Monosaccharides
• Amino Acids
• Nucleotides
• Glycerol + Fatty Acids