Refer to the figure showing an experiment using selectable marker (reporter) genes. 
Some cells are resistant to ampicillin and sensitive to tetracycline, some are sensitive to both antibiotics, and some are resistant to both.Which of these cell types should be the lowest in proportion in this experiment, and why?
Definitions:
Bicyclic Structure
A chemical compound featuring two interconnected rings, which can vary in size and the atoms they contain.
Line-Angle Formula
A simplified representation of a molecule showing how atoms are connected; lines represent bonds, and vertices represent carbon atoms.
Chair Conformation
A stable, puckered ring structure of cyclohexane that minimizes steric hindrance and strain.
Chair Conformation
A stable, six-membered ring conformation in cyclic molecules, notably cyclohexanes, that minimizes torsional strain.
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