Catalytic properties are found in :

Options

A. Proteins & Lipids
B. RNA & DNA
C. RNA & Proteins
D. DNA & Proteins

Answer

To solve the question "Catalytic properties are found in:", we will analyze each of the given options step by step.

### Step 1: Analyze Option 1 - Proteins and Lipids
- **Proteins**: Many proteins function as enzymes, which are biological catalysts that speed up chemical reactions. Therefore, proteins do exhibit catalytic properties.
- **Lipids**: Lipids do not have catalytic properties. They primarily serve as structural components of cell membranes and energy storage molecules.

**Conclusion**: Since lipids do not have catalytic properties, this option is incorrect.

**Hint**: Remember that while proteins can act as enzymes, lipids do not have catalytic functions.

### Step 2: Analyze Option 2 - RNA and DNA
- **RNA**: Some RNA molecules, known as ribozymes, can catalyze biochemical reactions. This indicates that RNA does have catalytic properties.
- **DNA**: DNA primarily serves as the genetic material and does not have catalytic properties.

**Conclusion**: Since DNA does not have catalytic properties, this option is also incorrect.

**Hint**: Consider the role of ribozymes in catalyzing reactions when evaluating RNA.

### Step 3: Analyze Option 3 - RNA and Proteins
- **RNA**: As mentioned earlier, RNA can act as a ribozyme and has catalytic properties.
- **Proteins**: Proteins include enzymes, which are well-known catalysts in biological processes.

**Conclusion**: Both RNA (as ribozymes) and proteins (as enzymes) exhibit catalytic properties, making this option correct.

**Hint**: Focus on the dual catalytic roles of RNA and proteins in biological systems.

### Step 4: Analyze Option 4 - DNA and Proteins
- **DNA**: As previously discussed, DNA does not have catalytic properties.
- **Proteins**: While proteins can act as enzymes, the presence of DNA in this option negates the overall catalytic property.

**Conclusion**: Since DNA does not have catalytic properties, this option is incorrect.

**Hint**: Remember that DNA's primary function is genetic information storage, not catalysis.

### Final Answer
The correct answer is **Option 3: RNA and Proteins**, as both exhibit catalytic properties.