The process of separation and purification of expressed protein before marketing is called:
1. Downstream processing
2. Bioprocessing
3. Post-product processing
4. Upstream processing
Stirred-tank bioreactors have been designed for
| 1. | addition of preservatives of the product |
| 2. | purification of the product |
| 3. | ensuring anaerobic conditions in the culture vessel |
| 4. | availability of oxygen throughout the process |