Answer: kills the bacteria.
- A inhibits growth only
- B kills the bacteria
- C dissolves bacteria alone
- D nourishes the bacteria
Correct answer: B. kills the bacteria
Explanation: Bactericidal antibiotics (e.g. penicillin) kill bacteria, whereas bacteriostatic ones merely stop their growth.
The hydrophobic hydrocarbon tail of each soap/detergent molecule dissolves into an oily dirt droplet, while the hydrophilic (ionic) head stays in the surrounding water - trapping the grease inside a micelle that rinses away with water.
Concept context
Drugs and how they interact with biological targets, chemicals in food, and cleansing agents (soaps and detergents) - chemistry applied directly to daily life and healthcare.