The organic compounds that are structural elements in the cell walls of plants and bacteria are known as

The correct answer is carbohydrates.

Explanation:

The cell walls of bacteria are formed of peptidoglycan, also known as murein. This is constructed from the chains of polysaccharide cross-linked by unusual peptides comprising D-amino acids. However, the cell walls of bacteria are distinct from the cells walls of plants, as, in case of plants, the cell walls are formed of cellulose.  

Both the peptidoglycan and cellulose are the components of carbohydrates.  

it's c (engineer's do their work with mechanical stuff not on any living being)

i believe the answer is 5,000