Blunt ends of passenger and vehicle DNAs are joined by

Options

A. DNA polymerase I
B. RNA polymerase
C. DNA ligase
D. DNA polymerase III

Answer

**Step-by-Step Solution:**

1. **Understanding DNA Ends**: DNA can be cut in two ways: blunt ends and sticky ends. Blunt ends are created when the DNA is cut straight across, leaving no overhanging bases.

2. **Identifying the Enzyme**: To join DNA fragments, specific enzymes are used. In the case of blunt ends, the enzyme responsible for joining these ends is DNA ligase.

3. **Function of DNA Ligase**: DNA ligase facilitates the formation of phosphodiester bonds between the blunt ends of the DNA strands, effectively sealing the DNA fragments together.

4. **Conclusion**: Therefore, the blunt ends of passenger and vehicle DNAs are joined by DNA ligase.

**Final Answer**: The blunt ends of passenger and vehicle DNAs are joined by DNA ligase.

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