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(A) Recombinant $DNA$ is formed by inserting a foreign $DNA$ fragment into a vector. In many cloning vectors,the foreign $DNA$ is inserted at specific

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Antibiotic resistant gene

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(A) Recombinant $DNA$ is formed by inserting a foreign $DNA$ fragment into a vector. In many cloning vectors,the foreign $DNA$ is inserted at specific restriction sites located within the antibiotic resistance genes. This insertion results in the insertional inactivation of the antibiotic resistance gene,which is a crucial step in identifying recombinant colonies.

Recombinant $DNA$ has an integrated fragment of:

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