Describe how recombinant DNA is introduced into host cell?

In food biotechnology, introducing recombinant DNA into a host cell is a key step for creating genetically modified organisms (GMOs), producing enzymes, improving nutritional content, or developing food additives. This process involves several carefully designed methods that allow the foreign DNA (also called transgene) to integrate into the host’s genome so the desired trait or product can be expressed.

The process starts with the preparation of recombinant DNA. This involves isolating the gene of interest, which could encode an enzyme (like chymosin used in cheese production) or a metabolic pathway (like enhanced vitamin synthesis in crops). This gene is inserted into a suitable vector — often a plasmid — which acts as a vehicle to carry the gene into the host cell. The plasmid typically contains an origin of replication, selectable marker _________ _____ _______ _____ _________ _____.
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