The formation of a protein's secondary and tertiary structures is due to the attraction and repulsion of _____.
a. positive and negative charges
b. nuclei
c. cell membranes
d. mRNA molecules
Question 2
Creatine is synthesized in the _____.
a. muscle, bone marrow, and gallbladder
b. liver, kidney, and pancreas
c. muscle, kidney, and heart
d. bone marrow, liver, and lungs