A) High voices in adult male singers
B) Increased body and facial hair in men
C) Lack of comb on male chickens
D) Increased docility in male farm animals
E) Abnormal adolescent muscular and skeletal development

A) are produced only by the adrenal cortex.
B) bind only to receptors on the cell surface.
C) are water-soluble.
D) act by binding to mRNA inside the target cell.
E) act by altering gene expression in the target cell.

A) Steroids
B) Proteins
C) Peptides
D) Carbohydrates
E) Amines