Refer to the Diagram Below

Multiple Choice

Refer to the diagram below. Which of the following events in the secretion of thyroxine is paired correctly with the location in the thyroid gland where it occurs?

A) 1 - An epithelial cell takes up iodine.
B) 2 - The cell synthesizes polymers of tyrosine-thyroglobulin.
C) 3 - Thyroglobulin is taken up by the cell.
D) 4 - Enzymes add iodine to thyroglobulin.
E) 5 - Endosome fuses with a lysosome.