Okay so nothing equals nothing so after that you get nothing
The charge on the protein is the sum of all positive charges and negative charges on the amino acids it contains. Proteins are composed of several amino acids that contains different functional groups. These groups may have positive, negative or neutral charges depending on the pH it is in.
Your answer is A: these two organisms have the same amino acid sequences, which suggests common ancestry
V= IR ==> I = V/R
For A: I = 9/3 = 3 amps
for B: I = 3/(1/2) = 6 amps
