Question

1. which of the following developed a set of postulates for determining whether a particular disease is caused by a particular pathogen? (0.5pts)

□ john snow
□ robert koch
□ joseph lister
□ louis pasteur

1. which of the following terms refers to a prokaryotic cell that is comma - shaped? (0.5pts)

□ coccus
□ coccobacilli
□ vibrio
□ spirillum

Explanation:

For question 6: Robert Koch developed Koch's postulates, a set of criteria to establish a causal relationship between a pathogen and a disease. John Snow is known for cholera epidemiology, Joseph Lister for antiseptic practices, and Louis Pasteur for pasteurization and germ theory work but not these specific postulates.
For question 7: Vibrio is the term for comma-shaped prokaryotic (bacterial) cells. Coccus is spherical, Coccobacilli are short oval/rod-shaped, and Spirillum is spiral-shaped.

Answer:

1. D. Robert Koch
2. B. Vibrio