A culture of E. coli is grown on minimal medium plates supplemented with either tryptophan, histidine, or lysine. The resulting
colonies are replica plated to three minimal medium plates containing no supplements. The next day, colonies grow on the minimal medium replica plated from the histidine and lysine plates, but colonies do not grow on the tryptophan replica plate. This indicates that the E. coli strain is a________.
Tryptophan is known to be a crystaline essential amino acid that is widely distributed or mostly found in proteins.
An auxotroph is an organism that is not able to synthesize a compound needed for its growth.
In this case, E. coli is described as a tryptophan auxotroph because it was unable to synthesize or make use of the tryptophan vy growing in the plate containing it.
Cells are pretty much the opposite of empty rooms. There are many organelles and processes happening in them, so there's no space for empty rooms. Even when there are spaces, which anyway would be full of liquid, these spaces have a purpose.
