Which of the following is not true of Escherichia coil?

Options

A. Gene recombination can occur through transformation, transduction and conjugation
B. It occurs in human intestine
C. It lacks true nucleus
D. It is diploid.

Answer

To determine which statement about Escherichia coli (E. coli) is not true, we will analyze each option provided in the question.

### Step-by-Step Solution:

1. **Understanding E. coli Characteristics**:
- E. coli is a unicellular prokaryote, which means it does not have a true nucleus or membrane-bound organelles.

2. **Evaluating the Options**:
- **Option 1**: "Genetic recombination can occur through transformation, transduction, and conjugation."
- This statement is true. E. coli can undergo genetic recombination through these three mechanisms.

- **Option 2**: "It occurs in the human intestine."
- This statement is also true. E. coli is commonly found in the intestines of humans and other warm-blooded organisms.

- **Option 3**: "It lacks a true nucleus."
- This statement is true. As a prokaryote, E. coli does not have a true nucleus.

- **Option 4**: "It is diploid."
- This statement is not true. E. coli is haploid, meaning it has a single set of chromosomes, not two sets as in diploid organisms.

3. **Conclusion**:
- The statement that is not true about E. coli is that "It is diploid." Therefore, the correct answer is this option.

### Final Answer:
The statement that is not true of Escherichia coli is: "It is diploid."

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