Question

Which of the following statements is incorrect?

• A. A bio-reactor provides optimal growth conditions for achieving the desired product
• B. Most commonly used bio-reactors are of stirring type
• C. Bio-reactors are used to produce small scale bacterial cultures
• D. Bio-reactors have an agitator system, an oxygen delivery system foam control system

Answer 1

The Correct Option is C

In the context of bio-reactors and their functionalities, we need to evaluate the statements provided to identify the incorrect one.

1. A bio-reactor provides optimal growth conditions for achieving the desired product. This statement is correct as bio-reactors are designed to maintain optimal environmental conditions (like temperature, pH, and nutrient supply) for the growth and productivity of microorganisms or cells.
2. Most commonly used bio-reactors are of stirring type. This statement is also correct. Stirred tank bio-reactors are widely used because they ensure efficient mixing and oxygen transfer.
3. Bio-reactors are used to produce small scale bacterial cultures. This statement is incorrect. Bio-reactors are typically employed for large-scale production processes, not small scale. In small-scale scenarios, simpler equipment like shaker flasks or small fermenters might be used.
4. Bio-reactors have an agitator system, an oxygen delivery system, and a foam control system. This statement is correct as these components are integral to the operation of bio-reactors, ensuring proper aeration and mixing.

The incorrect statement concerns the scale of production for which bio-reactors are employed, and hence, the correct answer is: Bio-reactors are used to produce small scale bacterial cultures.

Answer 2

Understanding Bio-reactors:

Bio-reactors are specialized vessels used for carrying out biological reactions. They provide the ideal environment for microbial growth, fermentation, or other biochemical processes. These reactors have different components like an agitator system, oxygen delivery, temperature regulation, and sometimes foam control to optimize the reaction environment.

Explanation of the options:

Option 1: This is a correct statement. Bio-reactors indeed provide optimal growth conditions, such as temperature, pH, and oxygen, which are crucial for the desired biological product production.

Option 2: This is also a correct statement. Most commonly used bio-reactors are of the stirring type, known as stirred-tank bioreactors. These systems ensure proper mixing of culture media, nutrients, and cells for consistent growth and productivity.

Option 3: This is the incorrect statement. Bio-reactors are typically used for large-scale production, not for small-scale bacterial cultures. They are used in the production of bio-products, pharmaceutical proteins, and other industrial products in large quantities. Small-scale bacterial culture is generally performed in laboratory flasks or smaller vessels.

Option 4: This is a correct statement. Modern bio-reactors are equipped with an agitator system for proper mixing, an oxygen delivery system for cellular respiration, and a foam control system to prevent foam buildup that can disrupt the process.

Step 2: Conclusion:

Thus, the incorrect statement is Option 3 - "Bio-reactors are used to produce small scale bacterial cultures." Bio-reactors are more suited for large-scale production and are not typically used for small-scale bacterial cultures.

Answer: The incorrect statement is Option 3.