using enzyme

using enzyme

by hanan khalil

​making cheese

• ​

Multiple Choice

Enzymes are considered to be 

• Lipids
• Carbohydrate
• Protein
• Nucleic Acid

Multiple Choice

What is the purpose  of an enzyme?

• give permission for the reaction
• raise activation energy
• speed up reactions
• control how many reactions occur

Multiple Choice

Where do substrates bind on an enzyme?

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

Multiple Choice

What happens when enzymes are heated to a high temperature?

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

Multiple Choice

What are the enzymes called when they are at low temperature? 

• denatured
• Killed
• inactive
• normal

Multiple Choice

What are the enzymes called when they are at high temperature or extreme pH?

• denatured

• Killed

• inactive

• normal

Multiple Choice

What happens to an enzyme when it is denatured?

• Activation energy is lowered.
• It becomes stronger.
• It loses its shape.
• Activation energy is raised.

Multiple Choice

Which factors can change the shape of an enzyme and thus denatures a enzyme?

• Excessive heat and changes in pH
• Nothing can
• Exposure to light and sound
• Exposure to bacteria and Amoebas

Multiple Choice

Every enzyme has a optimal temperature and pH. True or False?

• True 
• False

Multiple Choice

Based on the graph, what temperature does this enzyme work best? 

• 15 C
• 40 C
• 30 C
• 47 C

Multiple Choice

Cells can only work if their enzymes are functioning. What can you infer from the graph?

• Cells function best at low pH values

• Cells function fine at all pH values

• Cells function best at high pH values

• Cells do not function well if the pH is too high or too low

Multiple Choice

What is the optimal pH of enzyme A?

• 8

• 2

• 5.7-10

• 10

Multiple Choice

What is the optimal pH of enzyme B?

• 8

• 2

• 5.7-10

• 10

​making sweeter suger

Multiple Choice

Glucose is a _____.

• carbohydrate
• lipid
• protein 
• nucleic acid

Multiple Choice

Letter C...

• active site
• enzymes
• substrate
• products

​improving food with lipase

• ​

Multiple Choice

Which enzyme below is involved in the following chemical digestion process?
FATS---->FATTY ACIDS/GLYCEROL

• Lipase
• Trypsin
• Amylase
• Pepsin

Multiple Choice

What is the role of digestive enzymes?

• To absorb nutrients into the blood

• To absorb excess water from food that has not been digested

• To break down large, insoluble molecules into smaller, soluble molecules

• To synthesise larger molecules from the food we eat

Multiple Choice

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

• reusable
• catalyst
• specific
• fragile

Multiple Choice

What does bile do to fat?

• emulsifies it into small droplets

• decreases the surface area by emulsification

• Breaks it down to fatty acids

• creates a more acidic pH

Multiple Choice

Why does bile help fat digestion?

• It provides acidic conditions for lipase

• It increases the temperature by respiration

• It produces a larger surface area for lipase to work on

• It kills harmful bacteria

​how enzyme works

• ​

Multiple Select

Tick all that are true regarding the naming of enzyme.

• name after its product

• name after its substrate

• usually ends with -ase

• name after the scientist

Multiple Select

Tick all that apply to the lock and key mechanism.

• substrate acts as the key

• active site of enzyme act as the lock

• each enzyme can only work with a particular substrate

• enzyme remain unchanged after the reaction