You have discovered a new coccoid-shaped microorganism with no nucleus, a rigid cell wall, and a diameter of 2 μm. chemical tests reveal that its cell wall does not contain peptidoglycan. the new microorganism is.
a) most likely a bacterium.
b) most likely a eukaryote.
d) either a bacterium or an archaeon

C) Most likely an archaeon

Explanation:

Because this new microorganism has a rigid cell wall but lacks of peptidoglycan it is very likely that this is not a bacterium; bacterial cell walls are made of peptidoglycan.  

This new microorganism cannot be an eukaryote either because all eukaryotes have a nucleus in their cells.

It is possible that the new microorganism is an archeon (belongs to the Archea domain) because organisms within Archea have cell walls assembled from surface-layer proteins. Also, Archaea and bacteria are generally similar in size and shape including  2 μm microorganism and coccoid shapes.

hi my name is ashlynn and im 15

these macromolecules could either be amino acids, proteins or nucleic acids. they are responsible for the chemical changes and reactions that affects largely the cell and its composition. take for instance the cytoplasm of the cell where these organelles are settled. these simple organelles are composed of macromolecules which ignites and catalyses different functions that enables cells, in macro-perspective in motion and metabolism. in intestines for example, metabolism happens and breaking down parts of a food to simpler compounds that are used and these nutrients delivered throughout the body and again broken down by into smaller components.