Final answer:
McCarty's experiment, conducted with Avery and MacLeod, focused on identifying DNA as the genetic material through R cell transformation, a process likely different from that of a typical lab 9 procedure. Lab 9 could involve variability in sample preparation, comparison of theory versus practice, or techniques specific to microscopy, resulting in divergent outcomes. Experimental results may not be identical in replication due to variables in experimental methods and execution.
Step-by-step explanation:
The differences between McCarty's experiment and the one conducted in lab 9 can vary based on the procedures, materials, and objectives of the given lab session. McCarty, along with Avery and MacLeod, conducted experiments to identify the chemical nature of the genetic material using in vitro R cell transformation with purified components of heat-killed S-cells, ultimately identifying DNA as the transforming factor. In general lab experiments, results can differ each time due to variations in methodology, precise execution, and measuring tolerances, hence repeating the same experiment might not yield identical results.
For instance, the method of sample preparation for different microscopy techniques, such as fluorescence microscopy versus light microscopy, can present a difference. While fluorescence microscopy may require the sample to be tagged with fluorescent dyes for illumination under a specific wavelength, light microscopy may only require staining for contrast enhancement against a bright field background. Additionally, lab 9 could involve comparing theoretical models with actual experimental outcomes, a theme seen when molecular shapes on paper do not match the molecules created in the lab, prompting a re-evaluation of theoretical models.