Multiple Choice
Which of the following statements about peptide bonds is true?
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4. Protein Structure
Peptide Bond
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Which of the following statements correctly describes peptide hormones?
A
They are typically synthesized as inactive precursors called prohormones.
B
They are derived from cholesterol.
C
They can freely cross the lipid bilayer of cell membranes.
D
They are composed of amino acid chains linked by peptide bonds.
Verified step by step guidance1
Understand the nature of peptide hormones: Peptide hormones are composed of amino acid chains linked by peptide bonds. This structural feature distinguishes them from other types of hormones, such as steroid hormones.
Learn about their synthesis: Peptide hormones are typically synthesized as inactive precursors called prohormones. These prohormones are later activated through enzymatic cleavage to become functional hormones.
Compare peptide hormones to steroid hormones: Unlike peptide hormones, steroid hormones are derived from cholesterol. This is a key difference in their biochemical origin.
Examine their ability to cross cell membranes: Peptide hormones cannot freely cross the lipid bilayer of cell membranes due to their hydrophilic nature. Instead, they bind to specific receptors on the cell surface to initiate signaling pathways.
Summarize the correct descriptions: The correct statements about peptide hormones are that they are synthesized as inactive precursors called prohormones and are composed of amino acid chains linked by peptide bonds.
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