Question

Three of the following statements about enzymes are correct and one is wrong. Which one is wrong ?

• A. Enzymes are denatured at high temperatures but in certain exceptional organisms they are effective even at temperature $80^{\circ }-90^{\circ }C$
• B. Enzymes require optimum pH for maximal activity
• C. Most enzymes are proteins but some are lipids
• D. Enzymes are highly specific

Answer 1

Answer: (C)

Most enzymes are proteins but some are RNA enzymes e.g., ribozymes. Ribozymes are RNA molecules that exhibit enzyme (catalytic) activities. Ribozymes provide resistance to several viruses which is being applied in biotechnology in producing cDNA that encode for ribozyme and to integrate it into the host plant genome for developing resistant plants.