Insulin, a nonsteroid hormone, binds with a cell membrane receptor causing activation of proteins inside the cell. What would you consider insulin to be in this example?Multiple choice question.a first messengera second messengeran enzyme
Question
Insulin, a nonsteroid hormone, binds with a cell membrane receptor causing activation of proteins inside the cell. What would you consider insulin to be in this example?Multiple choice question.a first messengera second messengeran enzyme
Solution
In this example, insulin would be considered a first messenger. This is because it is the hormone that binds to the cell membrane receptor, initiating the signal transduction pathway. This pathway then leads to the activation of proteins inside the cell. Second messengers are molecules that relay signals received at receptors on the cell surface to target molecules inside the cell. Enzymes are proteins that catalyze (i.e., increase the rates of) chemical reactions. In this case, insulin is not acting as an enzyme or a second messenger, but as a first messenger.
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