Violet and blue have the high frequencies (thus energy) of visible light. Red will be the least energy but lowest energy. And remember, chlorophyll is green because it reflects green into our eyes. Green is therefore not absorbed, so not used for photosynthesis.
The P+ culture contains inserted DNA plasmid while P- culture does not contain DNA plasmid.
The purpose of P- bacteria culture is to take it as plasmid control.
Explanation:
There are two groups of bacteria using in the lab; one is control group and second is treatment group. Control group is denoted as P- group while treatment group is denoted as P+ group.
To differentiate between these two group we used the culture medium called Luria Broth with addition of an antibiotic ampicillin and the sugar arabinose.
The control group (P-) does not have plasmid stay same throughout the process because of absent of sugar arabinose.
The treatment group (P+) having plasmid show more growth due to arabinose.
