IN TERMS OF THE HIERARCHICAL ORGANIZATION OF LIFE A BACTERIUM IS AT THE _____ LEVEL OF ORGANIZATION.
To determine the level of organization at which a bacterium belongs in the hierarchical organization of life, we need to first understand the levels of organization from the smallest to the largest.
The hierarchical organization of life typically consists of the following levels: subatomic particles, atoms, molecules, organelles, cells, tissues, organs, organ systems, organisms, populations, communities, ecosystems, and finally, the biosphere.
Bacteria are single-celled organisms, which means they consist of only one cell. Therefore, the level of organization at which a bacterium belongs is the "cell" level.
In terms of the hierarchical organization of life, a bacterium is at the cellular level of organization.
Since this is not my area of expertise, I searched Google under the key words "classification bacterium" to get these possible sources:
http://www.earthlife.net/prokaryotes/phyla.html
http://en.wikipedia.org/wiki/Bacteria
http://encarta.msn.com/media_461530646/Classification_of_Organisms.html
http://encarta.msn.com/encyclopedia_761574409/Bacteria.html
(Broken Link Removed)
In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search.
I hope this helps. Thanks for asking.