Infectious agents such as: a. viruses always have a protein coat and a nucleic acid (dna or rna) b. bacteria usually are intracellular (found inside of cells) c. prions are easy to treat because they are denatured proteins d. protozoans are single-celled prokaryotes e. fungi are usually multicellular and large if they infect and cause human disease

A. viruses always have a protein coat and a nucleic acid (DNA or RNA)

Explanation:

Viruses are very small and simple beings, considered parasites for infecting cells of bacteria, protozoa, fungi, plants and animals. Surely you have heard of “flu viruses”, haven't you? Influenza is just one of the diseases caused by viruses that can infect humans. The virus (word that came from the Latin virus = poison / toxin) are simple and infectious little beings, formed basically by a protein capsule that surrounds the genetic material, can be DNA or RNA.

step 1 ammonium can be absorbed by plants, but some is converted into nitrates which are better for plants to absorb. this is called nitrification. 2. step 2 the deer eats the plants and uses the nitrogen-containing proteins for cell growth. 3. step 3 bacteria in the soil conduct nitrogen fixation to convert nitrogen gas from the atmosphere into ammonium. 4. step 4 some of the nitrates are absorbed back into plants, but denitrification breaks down the nitrates into nitrogen gas released back into the atmosphere. 5. step 5 nitrogen is found in the urine, which gets broken down into ammonium through the process of ammonification. 6. step 6 plants absorb the ammonium and begin assimilation, the process to add the nitrogen to protein.