When a steroid hormone and a peptide hormone exert similar effects on a population of target cells, then
A) the steroid and peptide hormones must use the same biochemical mechanisms.
B) the steroid and peptide hormones must bind to the same receptor protein.
C) the steroid hormones affect the synthesis of effector proteins, whereas peptide hormones activate effector proteins already present in the cell.
D) the steroid hormones affect the activity of certain proteins within the cell, whereas peptide hormones directly affect the processing of mRNA.
E) the steroid hormones affect only the release of proteins from the target cell, whereas peptide hormones affect only the synthesis of proteins that remain in the target cell.
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(a) Parathyroid hormone (PTH)
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