The type of proteins can function as chemical messengers or as receptors in the plasma membrane is communication proteins; option A.
What are proteins?
Proteins are large macromolecules composed of chains of amino acid units linked together by peptide bonds.
Proteins serve various functions such as:
Communication proteins such as hormones can function as chemical messengers or as receptors in the plasma membrane.
Learn more about proteins at: https://brainly.com/question/10058019
#SPJ1