Enzymes play an important role in biochemical reactions - VCE - SSCE Chemistry - Question 7 - 2012 - Paper 1
Question 7
Enzymes play an important role in biochemical reactions. Consider the following statements relating to enzyme-catalysed reactions.
I The shapes of the substrate an... show full transcript
Worked Solution & Example Answer:Enzymes play an important role in biochemical reactions - VCE - SSCE Chemistry - Question 7 - 2012 - Paper 1
Step 1
I The shapes of the substrate and the active site of the enzyme are complementary.
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Answer
This statement is true. Enzymes are specific to their substrates mainly because their shapes are complementary. This is often described by the 'lock and key' model.
Step 2
II When enzymes are denatured, the shape and structure of the active sites are not altered.
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Answer
This statement is false. When enzymes are denatured, the active site can change shape, rendering the enzyme inactive and unable to bind to its substrate.
Step 3
III The substrate forms bonds with the active site of the enzyme.
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This statement is true. Substrates interact with enzymes through various types of bonding (e.g., ionic bonds, hydrogen bonds), forming the enzyme-substrate complex.
Step 4
Of these statements
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Answer
Only statements I and III are true. Thus, the correct answer is 'only I and III are true.'
