The evolution of signaling molecules has made it possible for cells of multicellular organisms, such as humans, to communicate with one another in simple and complex ways. Signaling molecules may be used to transmit information between cells (extracellular or intercellular signaling), or they may be involved in signaling cascades inside cells (cytoplasmic or intracellular signaling). Test your basic knowledge of signaling molecules by taking this simple quiz.
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(1) The following amino acids also serve as neurotransmitters in the nervous system
(2) Which of the following amino acids serves as a precursor or intermediary metabolite in the biosynthetic pathway of the neurotransmitter/hormone epinephrine?
(3) Which of the following amino acids serves as a precursor or intermediary metabolite in the biosynthetic pathway of the neurotransmitter/hormone norepinephrine?
(4) Which of the following amino acids serves as a precursor or intermediary metabolite in the biosynthetic pathway of the neurotransmitter/hormone dopamine?
(5) Which of the following amino acids serves as a precursor or intermediary metabolite in the biosynthetic pathway of the thyroid hormones triiodothyronine (T3) and tetraiodothyronine (thyroxine or T4)?
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Posted: Monday, January 25, 2016
Last updated: Tuesday, March 11, 2025
Last updated: Tuesday, March 11, 2025
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