A vector is engineered with three features to facilitate its cloning within the host cells. List three features.

Explanation

To answer the question regarding the three features engineered into a vector to facilitate its cloning within host cells, we can break it down into the following steps:

### Step-by-Step Solution:

1. **Origin of Replication (ORI)**:
- The first essential feature of a cloning vector is the Origin of Replication (ORI). This is a specific sequence of DNA that allows the vector to replicate independently within the host cell. It ensures that when the host cell divides, the vector is also copied, leading to the propagation of the inserted gene.

2. **Selectable Marker**:
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