alleryAn antibiotic resistance gene on a vector serves mainly as a:
APalindromic site
BSelectable marker
CReplication origin
DRestriction target
Answer & Solution
Correct answer: B. Selectable marker
1. Most cells fail to take up the plasmid.
2. Plating on the antibiotic kills those that did not.
3. The resistance gene therefore selects transformants.
_Source: syllabus Biology, Ch 9 'Biotechnology : Principles and Processes'_
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