The diagram illustrates the process of creating genetically modified corn.

what occurs at step 4 in the diagram?
the foreign dna is placed in a mechanical vector for cloning.
the foreign dna is placed in a biological vector for cloning.
the foreign dna is inserted into the host cell genome.
the foreign dna is isolated by restriction enzymes.

The answer is The foreign DNA is placed in a biological vector for cloning.

After target genes are identified and isolated, they are usually inserted into a transfer factor. In the process of creating genetically modified crops, the transfer factor is plasmid (a circular DNA molecule) from a soil bacterium Agrobacterium tumefaciens. Therefore, the transfer vector in which the foreign DNA is placed is a biological vector. It is not artificially produced but isolated from the living bacterium.

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The best way to tell its true color is to look at the minerals streak