Which of the following enzymes has been incorrectly matched with their function ?

Options

A. Ligase -Molecular glue
B. Endonuclease -Chemical scalpel
C. DNA polymerase-Joins nucleosides
D. RNA polymease-Joins nucleotides

Answer

To determine which enzyme has been incorrectly matched with its function, we will analyze each enzyme and its corresponding function step by step.

### Step-by-Step Solution:

1. **Identify the Enzymes and Their Functions:**
We have four enzymes to analyze:
- DNA ligase
- Endonuclease
- DNA polymerase
- RNA polymerase

2. **Evaluate DNA Ligase:**
- **Function:** DNA ligase is described as a "molecular glue."
- **Analysis:** DNA ligase is responsible for joining DNA fragments together, which aligns with the description of it being a molecular glue.
- **Conclusion:** This match is **correct**.

3. **Evaluate Endonuclease:**
- **Function:** Endonuclease is referred to as a "chemical scalpel."
- **Analysis:** Endonucleases cleave or cut DNA at specific sites, acting like scissors to fragment DNA. This description is accurate.
- **Conclusion:** This match is **correct**.

4. **Evaluate DNA Polymerase:**
- **Function:** DNA polymerase is said to "join nucleosides."
- **Analysis:** DNA polymerase actually joins nucleotides, not nucleosides. Nucleotides consist of a nitrogenous base, a sugar, and a phosphate group, while nucleosides lack the phosphate group.
- **Conclusion:** This match is **incorrect**.

5. **Evaluate RNA Polymerase:**
- **Function:** RNA polymerase is stated to "join nucleotides."
- **Analysis:** RNA polymerase synthesizes RNA by linking nucleotides together, which is correct.
- **Conclusion:** This match is **correct**.

### Final Answer:
The enzyme that has been incorrectly matched with its function is **DNA polymerase**, as it should join nucleotides instead of nucleosides. Therefore, the answer is **option C**.

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