What is meant by nucleoid? Which group of organisms are associated with nucleoid? Give examples.

Explanation

### Step-by-Step Text Solution

1. **Definition of Nucleoid**:
- A nucleoid is a region within a prokaryotic cell that contains the genetic material (DNA). Unlike eukaryotic cells, prokaryotic cells do not have a membrane-bound nucleus. Instead, the DNA is located in the cytoplasm in a condensed form.

2. **Characteristics of Nucleoid**:
- The nucleoid typically contains a single, circular chromosome. This chromosome is not enclosed by a nuclear membrane, which is a key distinction from eukaryotic cells that have a well-defined nucleus.

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