Three of the following statements about enzymes are correct and one is wrong. Which one is wrong?
Correct answer: D. Most enzymes are proteins, but some are lipids
- A. Enzymes require optimum pH for maximal activity
- B. Enzymes are denatured at high temperatures but in certain exceptional organisms, they are effective even at temperatures 80° - 90°C
- C. Enzymes are highly specific
- D. Most enzymes are proteins, but some are lipids
Explanation
This statement is incorrect. Enzymes are primarily proteins. While there are some RNA molecules with catalytic activity known as ribozymes, enzymes composed of lipids are not common. The majority of enzymes are indeed proteins. Therefore, the wrong statement is D. Enzymes are predominantly proteins, and the presence of lipid-based enzymes is not a common characteristic.
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About Enzymes
Enzymes are biological catalysts that lower activation energy without being consumed, and their specificity is explained by the lock and key and induced fit models. Work includes the effects of temperature, pH and substrate concentration on reaction rate, plus competitive and non-competitive inhibition and how these differ.
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