To test for protein, you added biuret solution and

observed color changes. suppose that the color

data below was observed.

gelatin

(+ control)

pink/purple

water

(-control)

pink/purple

mystery food

sample

blue

the data above indicate an error. how do you

know? what might have caused the error?

Water sample showing pink/purple color is an error.

Explanation:

Biuret is a blue color reagent that changes its color to pink/purple whenever it detects protein in a sample. Water don't contain proteins so it should not show pink/purple color instead it should maintain the blue color. Food items generally contain proteins so it show pink/purple color but it showed blue color.

Error might have caused by wrong marking of the samples, test tube marked with Water might contain a mystery food while Mystery food tube might contain water.

answer; a male inherits only one allele of the x-linked gene controlling hair color;