Multiple Choice
Which protein modification is most closely linked to targeting proteins for degradation in eukaryotic cells?
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1. Introduction to Biochemistry
Proteins
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Which of the following proteins primarily functions as a chemical messenger in the human body?
A
Insulin
B
Actin
C
Myosin
D
Hemoglobin
Verified step by step guidance1
Understand the role of chemical messengers in the human body: Chemical messengers are molecules that transmit signals to regulate physiological processes. Proteins functioning as chemical messengers are typically hormones or signaling molecules.
Review the function of insulin: Insulin is a peptide hormone produced by the pancreas. Its primary role is to regulate blood glucose levels by signaling cells to uptake glucose, making it a chemical messenger.
Examine the function of actin and myosin: Actin and myosin are structural and motor proteins involved in muscle contraction. They do not function as chemical messengers.
Consider the role of hemoglobin: Hemoglobin is a protein in red blood cells responsible for transporting oxygen throughout the body. It is not a chemical messenger.
Conclude that insulin is the correct answer because it is the only protein listed that functions primarily as a chemical messenger in the human body.
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