Looking for classes? Ksquare Career Institute, Bengaluru →
Three of the following statements about enzymes are correct and one is wrong. Which one is wrong?
A
Enzymes require optimum pH for maximal activity
B
Enzymes are denatured at high temperature but in certain exceptional organisms they are effective even at temperatures $80^\circ$–$90^\circ C$
C
Enzymes are highly specific
D
Most enzymes are proteins but some are lipids
Detailed Solution
Almost all enzymes are proteins. The exceptions are some nucleic acids that behave like enzymes, called ribozymes (RNA enzymes). No enzyme is a lipid.
So the statement 'most enzymes are proteins but some are lipids' is wrong.
Each enzyme shows its highest activity at a particular optimum pH (true).
Enzymes are generally denatured at high temperatures, but enzymes isolated from thermophilic organisms living in hot vents and sulphur springs are stable and retain their catalytic power even at 80–90 °C (true).
Enzymes are highly specific for their substrates (true).
Hence the wrong statement is that some enzymes are lipids.
So the statement 'most enzymes are proteins but some are lipids' is wrong.
Each enzyme shows its highest activity at a particular optimum pH (true).
Enzymes are generally denatured at high temperatures, but enzymes isolated from thermophilic organisms living in hot vents and sulphur springs are stable and retain their catalytic power even at 80–90 °C (true).
Enzymes are highly specific for their substrates (true).
Hence the wrong statement is that some enzymes are lipids.