Auxotrophic Selection (-Ura): Selects and maintains URA3+ transformants of Saccharomyces cerevisiae in liquid culture by omitting uracil, using 2.0% glucose and 0.5% ammonium sulfate as defined carbon and nitrogen sources.

Plasmid Maintenance (URA3 Marker): Supports stable propagation of URA3-marked plasmids in yeast during cloning, expression, and strain construction.

Yeast Two-Hybrid Screens: Enables selection of reporter strains and plasmids requiring uracil dropout in liquid assays.

CRISPR/Cas9 Editing Workflows: Facilitates selection of edited yeast cells using URA3-based selectable markers in defined broth.

Library Selections and Enrichment: Performs pooled selections for barcoded or display libraries relying on URA3 auxotrophy.

Phenotypic Assays in Defined Media: Assesses growth, metabolite production, and stress responses under controlled 2% glucose/0.5% ammonium sulfate conditions without uracil.

Growth Curves and Kinetic Studies: Measures yeast growth rates and drug sensitivity in uracil-dropout broth.

Replica Plating and Dropout Validation: Confirms genotype (URA3 dependence) and plasmid retention following selection.

Protein Expression in Yeast: Cultures URA3+ expression strains for recombinant protein production in defined liquid media.

Genetic Crosses and Segregant Analysis: Selects desired meiotic progeny carrying URA3-linked traits in liquid selection steps.