E.coli is a gram negative bacterium is easy to handle and grow.

Explanation

### Step-by-Step Solution:

1. **Understanding E. coli**: E. coli is a type of bacteria that is commonly found in the intestines of humans and animals. It is known for being a model organism in microbiology.

2. **Gram Staining**: The statement mentions that E. coli is a gram-negative bacterium. To determine this, we perform a gram stain, which is a laboratory technique used to classify bacteria based on their cell wall composition.

3. **Color Result of Gram Staining**: After performing the gram stain, E. coli appears pink. This pink coloration indicates that it is gram-negative. The reason for this is the presence of a thin peptidoglycan layer and a thick outer membrane containing lipopolysaccharides in its cell wall.

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