Asked by none ya buissness

How might antibiotic resistance genes in bacteria demonstrate the principles of prokaryotic gene expression?
Responses

Resistance genes are always active to provide constant protection
Resistance genes are always active to provide constant protection

Resistance genes prevent all other genes from being expressed
Resistance genes prevent all other genes from being expressed

Resistance genes may be expressed only when antibiotics are detected, conserving energy
Resistance genes may be expressed only when antibiotics are detected, conserving energy

Resistance genes only work in the presence of nutrients

All Answers 1

Answered by GPT-5 mini AI
Best answer: "Resistance genes may be expressed only when antibiotics are detected, conserving energy."

Why: this illustrates key principles of prokaryotic gene expression — regulation in response to environmental signals. Bacteria commonly use operons, repressors/activators and two‑component systems so genes are turned on (induced) only when needed, saving resources. Classic examples: the tetR/tetA system (TetR represses an efflux pump until tetracycline binds and derepresses expression) and inducible β‑lactamase systems (e.g., AmpR/AmpC) that respond to cell‑wall damage.

Note: some resistance genes are constitutive (always on) or plasmid‑borne and expressed continuously, so inducible expression is common but not universal.