Enzyme decreases or stops the synthesis of an enzyme when the enzyme is not needed, whereas enzyme initiates the synthesis of an enzyme only when it is needed (the substrate is present).

the function of the protein macromolecule is to move things in and out of the cell and transport other molecules in the body. there are many functions of proteins. they are the basic building blocks of living things and are responsible for the growth and repair of body cells and tissues.

explanation:

answer; the tunica intima also called tunica interna, consists of elastic fibers,connective tissue and smooth muscle cells;

the answers are a and c