Enzyme Activity Quiz

Which graph shows the effect of temperature on the activity of an enzyme?

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The diagram represents enzyme action. What are parts W, X, and Y in this chemical reaction?
Which is the correct letter arrangement for Enzyme, Substrate, and Product on the option below?

• WYX

• XYW

• XWY

• YXW

The diagram represents a chemical reaction. Which diagram represents the enzyme for this reaction?

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The table shows the conditions in four test-tubes containing equal amounts of starch and salivary amylase. In which test-tube is the starch broken down fastest?

• A

• B

• C

• D

What is true of all enzymes?

• they are sugars

• they are not affected by pH level

• they are proteins

• they are not destroyed by heat

The diagram shows the effect of an enzyme working in the human digestive system. What would reduce the rate of production of amino acids?

• removing the amino acids as they are formed

• increasing the amount of protein

• raising the temperature to 39 °C

• raising the pH to 7.5

Which group of compounds ensures that metabolic reactions take place effectively?

• carbohydrates

• enzymes

• fatty acids

• hormones

The diagram shows an experiment on the digestion of the protein in egg albumen by protease. In which test-tube will the protein be digested most quickly?

• A

• B

• C

• D

Which effect does a gradual decrease in pH from 13 to 1 have on the action of amylase?

• slows it down only

• slows it down then speeds it up

• speeds it up only

• speeds it up then slows it down

Which graph shows the effect of temperature between 20 °C and 35 °C on the activity of a human digestive enzyme?

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