Ask Question
27 January, 20:36

The uncommon amino acid selenocysteine has an r group with the structure - ch2-seh (pka " 5). In an aqueous solution, ph = 7.0, selenocysteine would:

+2
Answers (1)
  1. 28 January, 00:20
    0
    In a pH 7-solution Selenocysteine has lost the proton bond to Selenium (Se-)

    Explanation:

    The amino acid-pka is the pH value where the proton in HSe changes from free to a bond with Selenium:

    -at pHs lower than 5: Selenium is protonated (HSe)

    - at pHs higher than 5: Selenium has a negative charge and the proton has been released into the solution. This is what happens in water (pH 7).

    Besides, at pH 7, the carboxyl group (COOH) has probably lost its proton (H) : and has a negative charge (COO-); and the amino group is not protonated yet (this happens at lower pHs) : the group is NH2. Then, the complete amino acid has two negative charges.
Know the Answer?
Not Sure About the Answer?
Find an answer to your question ✅ “The uncommon amino acid selenocysteine has an r group with the structure - ch2-seh (pka " 5). In an aqueous solution, ph = 7.0, ...” in 📘 Chemistry if you're in doubt about the correctness of the answers or there's no answer, then try to use the smart search and find answers to the similar questions.
Search for Other Answers