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9 July, 16:03

Which of the following are among the most common second messengers?

1. kinase and phosphatase

2. G proteins and GTP

3. kinase and phosphate groups

4. calcium ion and cAMP

5. GTP and GDP

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Answers (1)
  1. 9 July, 16:15
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    4. calcium ion and cAMP

    Explanation:

    Second messengers are the intracellular chemicals that are produced for signal transduction and generation of cellular response when a water-soluble hormone binds to its cell surface receptors. Since water-soluble signaling molecules such as protein hormones cannot cross the cell membranes of their target cells, their binding to the respective receptors triggers the production of an intracellular second messenger. The most common second messenger molecules are cAMP and calcium ions. For example, protein hormones bind to their G-protein linked membrane receptors and trigger the synthesis of cAMP in their target cells.
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