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What is needed for a recombinant plasmid to replicate in host?

Answer and explanation

Correct answer: Host-compatible origin of replication

The direct answer is B: the recombinant plasmid needs a host-compatible origin of replication. The origin of replication, or ori, is the DNA region where plasmid copying begins. Host enzymes and other replication proteins must recognize and work with that origin. If the ori is incompatible with the host, the plasmid may fail to replicate, become diluted as cells divide, and eventually disappear even if the insert is correct. Option B is correct. Option A, water, is necessary in cells but is not the specific genetic signal that starts plasmid replication. Option C, a protein-digestion enzyme, would not provide an origin and could damage proteins. Option D, chlorophyll pigment, has no role in plasmid DNA replication. Compatibility can also influence copy number and host range. Memory cue: ori is the plasmid's start point, but the host must understand it.

Related tags

Origin Of ReplicationHost CompatibilityPlasmid

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