Certified Cheese Professional Practice Exam

Which of the following is not classified as a type of bacteria?

1. Lactoferrin

2. E. Coli

3. Staphylococcus aureus

4. Yersinia enterocolitica

The correct answer is: Lactoferrin

Lactoferrin is a protein that is primarily found in milk and other bodily fluids and plays a key role in the immune system and iron metabolism. It is not classified as a type of bacteria but rather as a glycoprotein with antibacterial properties. In contrast, E. Coli, Staphylococcus aureus, and Yersinia enterocolitica are all specific types of bacteria. E. Coli, for instance, is a common bacterium found in the intestines of humans and animals, some strains of which can cause food poisoning. Staphylococcus aureus is known for causing a variety of infections, while Yersinia enterocolitica is associated with gastrointestinal illness. Therefore, the correct answer highlights the distinction between a protein and bacteria, making it clear that Lactoferrin does not fit into the bacterial classification.