Question

a protein called gef - h₁ is known to control immune responses to certain viruses such as influenza a. gef - h₁ is best classified as which kind of protein?
a structural protein
an antibody
an enzyme
a messenger protein

Explanation:

Structural proteins provide physical support. Antibodies are part of the immune - system but are specific Y - shaped proteins for antigen binding. Enzymes catalyze chemical reactions. Messenger proteins transmit signals. Since GEF - H1 controls immune responses, it is involved in signaling, so it is a messenger protein.

Answer:

a messenger protein