is this a technical replicate or biological replicate

[imsharmanitin]

i know that biological replicate is one taken from different organism/sample while technical replicate is one from same organism/sample.

However, I am not able to understand that a cell line treated with a drug three times separately to generate RNA-Seq data will be considered as biological replicate or technical replicate or a biological replicate but not in a strict sense. Also, will this be applicable for control sample?

Thanks in advance

[nucacidhunter]

I think it would be biological replicates and the same goes for control which should be treated with solvent without the drug. I imagine that there will be other treatments such as exposure time and dose as well in such experiments.

[jaspersaris]

As the variation during cultering is expected (and often is) far more variable then the technical reproducibility the biological replicate would be to repeat the actual incubations i.e. three times (for a triplicate).
A technical replicate would be having the same RNA sample sequenced two times (i.e. a duplo).
Often an experiment is repeated three times, getting n=3 for the experiment and statistics. In the experiment an incubation can be in duplo (i.e. two flasks stimulated with the same compound). Each incubation is then sequenced once.