What are culture and sensitivity tests used for? to determine the type of microbe present in an exudate to provide a specific medium that supports maximum microbial growth to identify the causative microbe and the effective antimicrobial agent for it to provide living host cells for microbes requiring such for replication

To identify the causative microbe and the effective antimicrobial agent for it

Explanation:

As the name implies, Culture test in microbiology helps to DISCOVER/IDENTIFY the KIND of micro organisms involved in an infection; while Sensitivity tests TELLS the how best to COUNTER the resulting disease effects

the answer will be a) proteins i believe

during the process of dna replication, brdu can replace thymidine and incorporate into the newly synthesized dna, cell proliferation thus can be reflected in the extent of brdu incorporation.