Repressor proteins are responsible for negative transcriptional regulation a. true b. false

The statement above is TRUE.
Negative transcriptional regulation involves the binding of the repressor protein to the operator in order to prevent a gene from been expressed. Transcription in eukaryotic cells is controlled by proteins which bind to specific regulatory sequences and modulate the activity of the enzyme concerned. Regulation of transcription can be negative or positive. 

The salt in the sea water dehydrated the sailor because her body could not take in the amount to salt in the sea water