Which one of the following statements about enzymes is not true?
A - VCE - SSCE Chemistry - Question 17 - 2009 - Paper 1
Question 17
Which one of the following statements about enzymes is not true?
A. Enzymes can only be denatured by an increase in temperature.
B. Enzymes may form temporary ion-... show full transcript
Worked Solution & Example Answer:Which one of the following statements about enzymes is not true?
A - VCE - SSCE Chemistry - Question 17 - 2009 - Paper 1
Step 1
A. Enzymes can only be denatured by an increase in temperature.
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Answer
This statement is not true. Enzymes can be denatured by various factors, including changes in pH, salt concentration, and exposure to certain chemicals, in addition to temperature increases.
Step 2
B. Enzymes may form temporary ion-dipole bonds with substrate molecules.
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Answer
This statement is true. Enzymes can form weak interactions such as ion-dipole bonds with their substrates, helping to stabilize the transition state and catalyze reactions.
Step 3
C. Enzymes speed up reactions by holding substrate molecules in positions necessary for reaction.
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This statement is true. Enzymes lower activation energy by positioning substrates in a way that promotes the formation of the transition state.
Step 4
D. The tertiary structure of an enzyme may be altered if one amino acid in its primary structure is substituted for another, different amino acid.
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Answer
This statement is true. The tertiary structure of an enzyme can change if a different amino acid is introduced in the primary structure, potentially impacting the enzyme's function.
