Question

An individual with a protein deficiency typically experiences increased susceptibility to illnesses, muscle and joint pain, and difficulty concentrating. Why does a protein deficiency cause such diverse symptoms? A.
because immune, nervous, and muscle system cells require proteins for structure and regulation
B.
because the only role of proteins is to provide the enzymes that all cells need to function
C.
because the membranes of immune, muscle, and nervous system cells consist entirely of proteins
D.
because proteins are the primary source of energy for many different cell types

Answer 1

The answer is A hope this helps

Answer 2

Answer is option A.

A protein deficiency causes such diverse symptoms because immune, nervous, and muscle system cells require proteins for structure and regulation.

Proteins are the building blocks of bones, muscles, cartilage, skin, and blood. They also help in  transporting oxygen, helps in blood clotting during injuries etc.