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DNA of E.Coli :...

DNA of E.Coli :

A

Double stranded and linear

B

Double stranded and circular

C

Single stranded and linear

D

Single stranded and circular

Text Solution

AI Generated Solution

The correct Answer is:
**Step-by-Step Solution:** 1. **Identify the Organism**: The question refers to E. coli, which is a type of bacteria. It is important to recognize that E. coli is classified as a prokaryotic organism. 2. **Understand Prokaryotic DNA Structure**: In prokaryotes, the genetic material is not enclosed within a nucleus. Instead, it is located in a region of the cell called the nucleoid. 3. **Characteristics of E. coli DNA**: The DNA of E. coli is characterized as being circular and double-stranded. Unlike eukaryotic DNA, which is linear and associated with histone proteins, E. coli DNA is associated with polyamines. 4. **Define the Types of DNA**: E. coli contains: - **Main Genetic Material**: This is the chromosomal DNA, which is a double-stranded circular DNA molecule. It is often referred to as a "false chromosome" because it lacks histone proteins. - **Plasmids**: In addition to the main chromosomal DNA, E. coli may also contain plasmids, which are extra-chromosomal circular DNA molecules. These plasmids can carry genes that provide advantages, such as antibiotic resistance. 5. **Select the Correct Answer**: Given the characteristics of E. coli DNA, the answer to the question about the type of DNA present in E. coli is that it is a double-stranded circular DNA molecule. **Final Answer**: The type of DNA present in E. coli is a double-stranded circular DNA molecule. ---
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