Multiple Choice
Which type of amino acid R groups are most likely to line the interior of a channel protein that facilitates the passage of water-soluble molecules?
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3. Amino Acids
Amino Acid Groups
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Which of the following is an example of a peptide hormone?
A
Insulin
B
Testosterone
C
Cortisol
D
Thyroxine (T4)
Verified step by step guidance1
Step 1: Understand the definition of a peptide hormone. Peptide hormones are composed of chains of amino acids and are synthesized as precursors (prohormones) that are later cleaved to form the active hormone. They are water-soluble and act on cell surface receptors.
Step 2: Analyze the options provided. Insulin, testosterone, cortisol, and thyroxine (T4) are all biologically active molecules, but they belong to different classes of hormones.
Step 3: Recall the classification of each option: Insulin is a peptide hormone, testosterone is a steroid hormone, cortisol is also a steroid hormone, and thyroxine (T4) is an amino acid-derived hormone.
Step 4: Focus on insulin. Insulin is synthesized as a precursor (preproinsulin), which is cleaved to form proinsulin and then further processed to produce the active peptide hormone. It regulates glucose metabolism by binding to receptors on the cell surface.
Step 5: Conclude that insulin is the correct example of a peptide hormone, as it fits the definition and characteristics of this hormone class.
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