3. Steroid hormones remain in circulation longer than peptide hormones because they are: a) produced as prohormones b) side chains attached to the basic carbon ring structure c) bound to specific...

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Extracted text: 3. Steroid hormones remain in circulation longer than peptide hormones because they are: a) produced as prohormones b) side chains attached to the basic carbon ring structure c) bound to specific transport proteins in the blood plasma d) attached to the hemoglobin molecule for cellular use 4. Hormones alter the operations of target cells by changing the: a) plasma membrane permeability properties b) types, amounts, or activities of important enzymes and structural proteins c) arrangement of the molecules making up the plasma membrane d) rate which hormones affect the target organ cells