Question

The process of separation and purification of expressed protein before marketing is called :

• A. Downstream processing
• B. Bioprocessing
• C. Postproduction processing
• D. Upstream processing

Answer 1

The Correct Option is A

The question pertains to the stages involved in the production and preparation of proteins for the market. In biotechnology and biochemical production, the overall process can broadly be divided into two main phases: upstream processing and downstream processing.

1. Upstream Processing: This phase includes the initial steps required for synthesizing the desired biological products. It involves activities like fermentation, scaling up, cell culture, and feeding strategies to grow the organisms that produce the protein or product.
2. Downstream Processing: This is where the separation and purification of the bioproduct, in this case, proteins, take place. It ensures that the final product is free from contaminants and is ready for marketing or use. Downstream processing involves several steps such as filtration, centrifugation, precipitation, chromatography, and drying. It is critical as it ensures the product's safety, efficacy, and market viability.
3. Bioprocessing: This term generally encompasses both upstream and downstream processing. It refers to the entire process of using living cells or their components (like enzymes) to obtain desired products.
4. Postproduction Processing: Although similar-sounding, this term is not commonly used in the standard classification of biotechnological processes. It might refer to final product formulation and packaging, rather than the critical separation and purification phase.

Based on the definitions and the steps involved, the correct answer to the question is Downstream processing. This phase is critical for achieving a pure and market-ready product.