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

a. the law of proportion states the combination of 2 atoms in a specific ratio to produce multiple compounds such as the given statement of question ‘1st compound contains 88.8 % cu ’ indicates 88.8 g of cu is present along with 11.2 g oxygen in 100 g of compound whereas the statement ‘2st compound contains 79.9 % cu ’ indicates 79.9 g of cu is present along with 20.1 g oxygen in 100 g of compound

1st compound contains 88.8 g cu

for cu

m = 63 g /mol

atomic % = 88.8 /63 = 1.42

for o

m = 16 g /mol

atomic % = 11.2 /16 = 0.7

b. the emperical formula of 1st compound is

cu1.4o0.7

cu2o