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DNA of Escherichia coli is...

DNA of Escherichia coli is

A

ss and circular

B

ss and linear

C

ds and linear

D

ds and circular.

Text Solution

AI Generated Solution

The correct Answer is:
**Step-by-Step Solution:** 1. **Identify the Organism**: The question asks about the DNA of Escherichia coli, which is a type of bacteria. 2. **Understand the Classification**: Escherichia coli belongs to the kingdom Monera and is classified as a prokaryote. Prokaryotes are characterized by the absence of a distinct nucleus. 3. **DNA Structure in Prokaryotes**: In prokaryotes like Escherichia coli, the DNA is typically found in a circular form rather than linear. This circular DNA is often referred to as the nucleoid. 4. **Distinguish Between DNA Types**: The options provided include terms like SS (single-stranded) and DS (double-stranded). - Single-stranded DNA has only one polynucleotide strand. - Double-stranded DNA consists of two polynucleotide strands that are coiled together, resembling a twisted ladder. 5. **Eliminate Incorrect Options**: Since Escherichia coli is a prokaryote, it cannot have linear DNA. Therefore, options that mention linear DNA can be eliminated. 6. **Determine the Correct Answer**: Escherichia coli has double-stranded DNA, which is also circular. Therefore, the correct answer is that the DNA of Escherichia coli is double-stranded and circular. **Final Answer**: The DNA of Escherichia coli is double-stranded and circular. ---
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