Question

Recombinant protein production in animal cells is typically

• A. Growth-independent
• B. Only during death phase
• C. Growth-associated or partially growth-associated
• D. Independent of nutrients

Hint:

Remember: \[ \boxed{\text{Animal Cell Growth} \Longrightarrow \text{Recombinant Protein Production}} \] Many recombinant proteins are produced during the exponential phase and may continue into the stationary phase.

Answer 1

The Correct Option is C

Concept: Recombinant proteins are proteins produced by genetically engineered cells containing recombinant DNA. Animal cells such as Chinese Hamster Ovary (CHO) cells and HEK-293 cells are commonly used because they perform proper protein folding and post-translational modifications. Protein production is generally associated with cell growth, although in some cases it may continue even after the exponential growth phase.

Step 1: Understand recombinant protein production.
During cultivation, animal cells first multiply rapidly. As cell biomass increases, recombinant proteins are synthesized. \[ \boxed{\text{Cell Growth} \Longrightarrow \text{Recombinant Protein Production}} \] In many industrial processes, protein synthesis continues into the early stationary phase, making it partially growth-associated.

Step 2: Importance in biotechnology.
Animal cells are widely used for producing:
• Monoclonal antibodies
• Hormones
• Blood clotting factors
• Therapeutic enzymes
• Vaccines These products require proper glycosylation and protein folding, which animal cells can provide.

Step 3: Eliminate incorrect options.

• Recombinant protein production is not completely growth-independent.
• It does not occur only during the death phase.
• Nutrient availability strongly influences protein production.
• Therefore, growth-associated or partially growth-associated is the correct answer. Final Answer: \[ \boxed{Option (C) is correct \]