Quiz 5 HUN 4221 Sp2011 KEY

Quiz 5 HUN 4221 Sp2011 KEY - Select the correct statement(s...

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HUN 4221 Spring 2011 Quiz 5 KEY Multiple Choice (2 pts) 1. Select the correct answers that describe tocopherol’s role as an antioxidant. (a) the phytyl side chain of tocopherol easily donates hydrogen ions to free radicals (b) the phenolic ring of tocopherol allows for donation of hydrogen ions to free radicals (c) peroxyl free radicals react more quickly with polyunsaturated fatty acids than with vitamin E (d) (e) none of the above 2. You are writing a chapter on vitamin A for Present Knowledge in Nutrition. Select the correct fact(s) that could be included. (a) When retinol is transported and taken up by pigment epithelium cell, the holo-RBP dissociates from TTR and is taken up by cell by endocytosis (b) Majority of vitamin A stored in liver is primarily stored in the parenchymal cells (c) In the rod cells 11-trans retinal binds to opsin to form rhodopsin (d) All of the above (e) None of the above 3. You are a preparing a lecture on vitamin A for Nutrition and Metabolism and want to include the mechanism by which vitamin A regulates gene function.
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Unformatted text preview: Select the correct statement(s) to include. (a) CRBPII transports all-trans and 9-cis retinol to the nucleus (b) retinol is oxidized in the cytoplasm to all-cis and 9-trans retinoic acid (c) all-trans retinoic acid binds RAR and 9-cis retinoic acid binds to RXR in the nucleus (d) all of the above (e) none of the above True or False (1 pt) 4. When vitamin E is commercially synthesized for supplements, the one chemical form present is RRR-α-tocopherol. (a) True (b) False 5. Vitamin E is transported from the enterocyte to the liver as a component of chylomicrons. (a) True (b) False 6. A patient with scurvy who is consuming a low vitamin E diet would be at greater risk for erythrocyte hemolysis than a patient who has been successfully treated for scurvy. (a) True (b) False 7. Serum retinol concentrations are reflective of the liver vitamin A stores. (a) True (b) False...
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Quiz 5 HUN 4221 Sp2011 KEY - Select the correct statement(s...

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