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29.08.2019 •
Chemistry
Tamoxifen is a drug used to prevent recurrence of certain types of breast cancers that require estrogen to grow. tamoxifen binds to the active site of the estrogen receptor protein, preventing estrogen from binding to the enzyme. once tamoxifen binds to the protein, the protein is permanently deactivated. which of the following descriptions best fits tamoxifen? a. tamoxifen is a reversible, noncompetitive inhibitor. b. tamoxifen is an irreversible, noncompetitive inhibitor. tamoxifen is an irreversible, competitive inhibitor. d. tamoxifen is a reversible, competitive inhibitor. e. tamoxifen is not an inhibitor.
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Ответ:
Tamoxifen is an irreversible, competitive inhibitor.
Explanation:
In order to binds to the active site of the estrogen receptor protein, tamoxifen have to compete with the other chemical compound, and inhibits the estrogen release, so it is a competitive inhibitor. Then, you said that when tamoxifen binds to the receptor, the protein is permanently deactivated, so it is also irreversible.
Ответ:
V = 0.798 L
Explanation:
Hello there!
In this case, for this gas stoichiometry problem, we first need to compute the moles of carbon dioxide via stoichiometry and the molar mass of starting calcium carbonate:
Next, we use the ideal gas equation for computing the volume, by bearing to mind that the STP conditions stand for a pressure of 1 atm and a temperature of 273.15 K:
Best regards!