How is the action of exonuclease different from that of endonuclease ?

Explanation

**Step-by-Step Solution:**

1. **Definition of Exonuclease:**
- Exonuclease is an enzyme that removes nucleotides from the ends of a DNA molecule. It can act on either the 5' or 3' end of the DNA strand, progressively cleaving off one nucleotide at a time.

2. **Definition of Endonuclease:**
- Endonuclease is an enzyme that makes cuts at specific positions within the DNA strand. It does not remove nucleotides from the ends but instead cleaves the DNA at internal sites.

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