Match each type of organism with the best description of its oxygen requirements.

Who first observed unicellular organisms, which he called “animalcules,” using a microscope he developed?

Microbial ecology is defined as the study of:

Who is credited for his “accidental” discovery of a naturally occurring antimicrobial agent?

Select all of the components present in both Gram-positive and Gram-negative bacterial cell walls: 

Which group of organisms can reproduce both sexually and asexually? 

Match the cell type to its best definition. 

Which term describes a microorganism that can cause disease? 

Helicobacter pylori, a bacteria that lives in the human stomach, is an example of which class of organism?  

Select all characteristics that are found only in eukaryotic cells: