Answer: Binds the receptor and blocks its natural messenger.
- A Dissolves the cell membrane
- B Activates the receptor like the natural messenger
- C Speeds up an enzyme reaction
- D Binds the receptor and blocks its natural messenger
Correct answer: D. Binds the receptor and blocks its natural messenger
Explanation: Antagonists bind to the receptor and block the natural chemical messenger, inhibiting its action. Agonists, in contrast, mimic and activate the receptor.
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.