All enzymes are not proteins. Which of the following enzyme is not a protein?

Options

A. Ribozyme discovered by Cech (1981)
B. Ribonuclease discovered by Altman (1983)
C. Both correct
D. DNA/RNA polymerase.

Answer

To solve the question "All enzymes are not proteins. Which of the following enzyme is not a protein?", we can follow these steps:

### Step 1: Understand what enzymes are
Enzymes are biological catalysts that accelerate chemical reactions in living organisms. While most enzymes are proteins, there are exceptions.

### Step 2: Identify types of enzymes
Most enzymes are proteins, but some are not. Notably, there are enzymes known as ribozymes, which are made of RNA rather than protein.

### Step 3: Analyze the options given in the question
Without the specific options provided in the question, we can still conclude that ribozymes and ribonucleases (which contain RNA) are examples of enzymes that are not proteins.

### Step 4: Select the correct answer
Based on the information that ribozymes and ribonucleases are enzymes that are not proteins, if any of the options provided in the question include these, they would be the correct answer.

### Conclusion
The correct answer to the question is that ribozymes and ribonucleases are examples of enzymes that are not proteins.

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