An indicator for a protein is added to a solution that contains protein and to a solution that does

not contain protein. State one way, other than the

presence or absence of protein, that the two

solutions may differ after the indicator has been

added to both. [1]

There would be a color change

Explanation:

Biuret solution is used to identify the presence of protein. Biuret reagent is a blue solution that, when it reacts with protein, will change color to pink-purple.

Since one of the solutions does not contain protein, the blue color of the Biuret reagent will not change.

explanation:

b,bacteria convert nitrates

into nitrogen gas.

d,plants and animals take in

and use nitrogen compounds.

e,bacteria break down waste    

products and return nitrogen  

to the soil.

a,bacteria convert atmospheric

nitrogen to ammonia.

c,bacteria convert ammonia

to nitrites and nitrates.