AEMCA Practice Exam

What characterizes ricin?

1. A powerful allergen

2. A potent antibiotic

3. A powerful cytotoxin

4. A common disinfectant

The correct answer is: A powerful cytotoxin

Ricin is characterized as a powerful cytotoxin. It is derived from the castor bean plant and is known for its ultra potent toxic properties. Once inhaled or ingested, ricin can inhibit protein synthesis within cells, leading to cell death and potentially resulting in severe health effects. The mechanism of action of ricin is what makes it particularly dangerous, as it can affect various organ systems and lead to serious illness or death. In contrast, the other options do not accurately define ricin. It is not an allergen, which would cause an immune system response. It also is not an antibiotic, as it does not have properties to kill bacteria or inhibit their growth. Lastly, ricin is not a disinfectant used to kill pathogens on surfaces; rather, it is a highly toxic substance that poses significant health risks when introduced into the body.