Final answer:
The organism used for large scale protein interactions assays is Saccharomyces cerevisiae (yeast), as it is a eukaryotic model organism that modifies proteins similarly to human cells and has a well-studied genome.
Step-by-step explanation:
The organism used for performing large scale protein interactions assays that we are going to search is Saccharomyces cerevisiae (yeast). This eukaryotic model organism is preferred because, unlike Escherichia coli (bacteria), yeast cells produce and modify proteins similar to human cells, which is crucial for recombinant DNA technology experiments. Since yeast has a simpler eukaryotic structure, it allows the study of protein interactions and signaling cascades that have counterparts in humans. Moreover, yeasts like Saccharomyces cerevisiae have been extensively studied, and their genome sequences are known, which aids in genome annotation and molecular biology experiments.
Fungi, such as yeast, are important model research organisms and have been extensively used in genetic research. Yeast cells, being eukaryotic, have similar protein modifying capabilities to human cells, making them suitable for studying protein interactions. Additionally, yeast cells can be easily manipulated genetically and grow quickly in culture, making them ideal for large-scale experiments.