Question

A biotechnology company wants to use bacteria to produce human insulin. How would understanding operons help them control insulin production?
Responses

Operons would allow the bacteria to survive without nutrients
Operons would allow the bacteria to survive without nutrients

They could use operon systems to turn insulin production on or off as needed
They could use operon systems to turn insulin production on or off as needed

Operons would make the insulin identical to human insulin
Operons would make the insulin identical to human insulin

Operons would prevent the bacteria from mutating

Answer 1

Correct choice:
- They could use operon systems to turn insulin production on or off as needed.

Why that is correct (brief):
- An operon is a set of bacterial regulatory DNA elements (promoter/operator plus structural genes) whose expression can be switched by regulatory proteins or small-molecule inducers/repressors. Biotechnology uses the same principle when placing a human insulin gene under control of a bacterial promoter/operator (or an inducible expression system). That lets you keep expression off during cell growth (reducing metabolic burden and toxicity) and then turn it on at a chosen time (by adding IPTG, arabinose, tetracycline analogs, heat shock, etc.) to produce insulin.

Why the other options are incorrect:
- “Operons would allow the bacteria to survive without nutrients” — false. Operons regulate gene expression; they don’t provide nutrients or make bacteria independent of external nutrients.
- “Operons would make the insulin identical to human insulin” — false. Operons only control whether/when a gene is expressed. Producing authentic human insulin also requires correct gene sequence, proper folding and disulfide bond formation, and appropriate processing (often expressed as proinsulin or as separate chains and then processed/chemically folded). Bacteria can produce biologically active insulin but additional engineering/process steps are needed.
- “Operons would prevent the bacteria from mutating” — false. Operons do not stop mutations; mutation rates are intrinsic to replication and can be affected by selection or strain choices but not prevented by using an operon.

Practical note:
- In practice, recombinant insulin production typically uses inducible bacterial expression systems (lac/T7, PBAD, etc.) on plasmids and fermentation strategies to control timing and level of expression for best yield and product quality.