To predict: The effect if a water-soluble hormone is injected directly into the cytosol of a target cell.
Introduction:
Hormones are small molecules that act as chemical messengers in the body. They regulate the body processes by binding to their specific receptors. For lipid-soluble hormones, the receptors are intracellular and for water-soluble hormones, the receptors are present on cell surface.
Explanation of Solution
Water-soluble hormones are membrane insoluble and bind to the membrane receptors. These membrane receptors are partly present on the outer cell surface for binding the hormone and some part protrudes on the inner side of membrane for the hormonal effect. The binding of water-soluble hormones to membrane receptor proteins trigger a cellular response through signal transduction. Thus, if a water-soluble hormone is directly injected into the cytosol of a target cell, it would not be able to bind to its specific receptors in the membrane. As a result, the cellular response would not be triggered.
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Chapter 45 Solutions
Biology Concepts and Connections Custom Edition for Everett College