Limpids, proteins, polysaccharides, and nucleic acids are large polymers that make up different components of our bodies. Which element can be found as the back bone of all of these macromolecules? A. Nitrogen B. Oxygen C. Phosphorus D. Carbon. The answer is D. Carbon. I had this question on an assignment.

Which of the following matches the organisms described with the correct domain? a. archaea--multicellular, eukaryotic organisms that do not have cell walls b. eukarya--single-celled and multicellular organisms, with a defined nucleus and a variety of nutritional sources c. bacteria--unicellular, eukaryotic organisms with cell walls that do not contain peptidoglycan d. bacteria--unicellular, eukaryotic organisms that always lack cell walls