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:

Antibodies are proteins involved in immune - responses. Since GEF - H1 controls immune responses to viruses like influenza A, it is most likely an antibody. Structural proteins provide support and shape to cells and tissues, enzymes catalyze chemical reactions, and messenger proteins transmit signals.

Answer:

B. an antibody