What is the charge on the tetrapeptide lys-lys-his-glu at ph 7?

The charge on peptide chain lys-lys-his-glu at pH 7 is +1.

Explanation: A peptide chain is the chain formed from the condensation of two amino acids releasing molecule and forming N-terminal(Nitrogen- end) and C-terminal(Carboxyl-end). The bonds formed are known as peptide bonds.

Here 4 amino acids join together forming a peptide chain

In this peptide chain N-terminal is from lysine (lys) and C-terminal is from Glutamic acid (Glu).

At pH=7,

So, there are 3 amino groups present each having (+1) charge and 2 carboxyl groups each having (-1) charge.

Total charge on peptide chain =

                                                   = +1

what is the volume occupied by 40 grams of argon gas (ar) at standard conditions? what volume, in liters, is occupied by 1.5 x 1023 

it is a good conductor

explanation: