Which of the following feature is correct for bacteria?

Options

A. Presence of intervening sequence in DNA
B. DNA does not show coiliong
C. Linear ss-DNA representing single chromosome
D. DNA can be chromosomal as well as extra chromosomal

Answer

To determine which feature is correct for bacteria, we will analyze each of the given statements one by one.

### Step-by-Step Solution:

1. **Presence of Intervening Sequence in DNA**:
- Intervening sequences, also known as introns, are segments of DNA that are transcribed into pre-mRNA but are removed during RNA processing.
- In bacteria (prokaryotes), there are no introns present in their genomic DNA. Thus, this statement is **incorrect**.

2. **DNA Doesn't Show Coiling**:
- Bacterial DNA is known to be coiled and exhibits a structure called supercoiling.
- Specifically, bacterial DNA typically shows negative supercoiling, where the DNA strands are coiled in the opposite direction. Therefore, this statement is also **incorrect**.

3. **Linear Single-Stranded DNA Representing Single Chromosome**:
- Bacterial DNA is generally double-stranded and circular, not linear or single-stranded.
- While bacteria have a single chromosome, it is not in the form of linear single-stranded DNA. Hence, this statement is **incorrect**.

4. **DNA Can Be Chromosomal as Well as Extra Chromosomal**:
- Bacteria possess two types of DNA: genomic DNA (chromosomal DNA) and plasmid DNA (extra-chromosomal DNA).
- This statement accurately reflects the nature of bacterial DNA, making it the **correct statement**.

### Conclusion:
The correct feature for bacteria is that **DNA can be chromosomal as well as extra chromosomal**.

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