Which Statement About the Thyroid Gland Is True

question 79

Multiple Choice

Which statement about the thyroid gland is true?

• A) The first step in producing thyroxine is production of thyroglobulin, a large protein made from tryptophan residues.
• B) Thyroglobulin is iodinated and later cleaved by lysosomal enzymes into smaller molecules.
• C) Epithelial cells that make up follicles in the thyroid gland produce calcitonin.
• D) Triiodothyronine (T₃) contains three tyrosine residues, and tetraiodothyronine (T₄) contains four tyrosine residues.
• E) Cells near the follicles of the thyroid gland produce calcitriol.

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