Abiologist wants to test some lake water for the presence of nitrates. he has a sensor that detects even the tiniest amount of nitrates by turning an internal light from green to red. a) what will be his positive control? (specific). b) what will be his negative control? (specific). c) why does he need o include these controls? solution pls

Describe the layers of the suns atmosphere?

Protein and polypeptide sequences can be determined by first partially hydrolyzing the protein or polypeptide followed by amino acid sequencing of the fragment pieces using the chemical degradation process known as edman degradation. determine the sequence of the initial (18-amino acid) polypeptide that produces the following five partial sequences after hydrolysis and edman degradation.

Si units are the modern form of the