Bio Ch4 revision

Which of the comparisons between a catabolic reaction and an anabolic reaction is correct?

• A

• B

• C

• D

The reaction shown in the graph is ...

• an anabolic process because energy is absorbed.

• an anabolic process because energy is released.

• an catabolic process because energy is absorbed.

• an catabolic process because energy is released.

Which of the following graphs correctly shows the change in the energy level of the reaction if the enzyme involved is absent?

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• 
• 
• 

Which drawing represents the substrate in this anabolic reaction?

• P

• Q

• S

• T

Which drawing represents the enzyme-substrate complex in this anabolic reaction?

• P

• Q

• S

• T

Which of the following graphs correctly shows the changes in the amount of products in a reaction catalysed by a human enzyme at different temperatures?

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• 
• 
• 

Which of the following statements correctly describes the enzyme reaction?

• A) The enzyme is denatured at 0 °C and 60 °C.

• B) The reaction taking place at 50 °C is faster than that at 20 °C.

• C) There are more collisions between substrate and enzyme molecules at 40 °C than 60 °C

• D) The amount of product collected at the end of the reaction is greatest if the reaction takes place at 40 °C.

Which of the following statements about enzymes is incorrect?

• A) Enzymes are produced by cells.

• B) Enzymes are denatured at extreme temperatures.

• C) There could be more than one specific enzyme to catalyse the same reaction.

• D) When an enzyme encounters the same substrates, it always produces the same products.

The time taken for an enzymatic reaction to complete at different temperature is shown.

Which of the following about the enzyme can be concluded?

(1) Its optimum temperature is 30 °C.

(2) Its activity decreases with temperature.

(3) Its activity at 30 °C is higher than that at 10 °C.

• A (2) only

• B (3) only

• C (2) and (3) only

• D (1), (2) and (3)