Classification of Microorganisms


includes the kingdoms Plantae, Fungi, and Animalia


includes prokaryotes that do not have peptidoglycan in their cell wall


includes prokaryotes with peptidoglycan in their cell walls and also photosynthetic prokaryotes

Extreme Halophiles

includes prokaryotes that require a high concentration of salt for survival


includes prokaryotes that grow in extremely hot environments

Examples of Archaea

-extreme halophiles

Examples of Bacteria

-gram-positive bacteria

Examples of Eukarya

-green algae
-slime molds

Which of the following is NOT a characteristic of members of the Domain Archaea?

They contain nuclei.

A unicellular, photosynthetic nucleated cell would belong to which domain?


The first cells were formed approximately __________ years ago.

3 billion

Why is visualization not sufficient to properly identify bacteria?

Bacteria have a limited set of shapes and many unrelated bacteria share the same shape.

What is the hallmark of dichotomous keys?

They consist of a series of paired statements, in which only one statement of each pair applies to a given organism.

Biochemical tests _________________.

are the main methods used to identify unknown bacteria