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Question
Indicate whether the statement is true or false. If the statement is false, explain why it is false.Production of active vitamin D requires skin, sunlight, cholesterol, the liver, and the kidneys.
Answer
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Why are vitamins A and E said to be antagonists of vitamin K?
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Although for micronutrients increasing the amount of a protein by directly inducing gene expression is certainly a common mechanism, we have encountered other mechanisms by which vitamins can regulate proteins. Provide one example of posttranslational modification, being as specific as possible.
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The active form of vitamin A that regulates cell differentiation through gene expression is _____.
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The 2 forms of naturally occurring provitamin D are: _____ and _____.
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Match each vitamer with its function.Vitamer1) 11-cis retinal2) retinoic acid3) alpha-tocopherol4) calcitriol5) hydroquinone (KH2)Functiona. interacts with nuclear VDR to increase calbindin b. required for carboxylation of glutamic acid c. needed for binding with opsin in the photoreceptor rod cells d. transported into nucleus to affect gene transcription of keratin proteins e. donates hydrogens to terminate propagation of membrane lipid peroxidation chain reactions
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A genetic deficiency in _____ leads to a vitamin E deficiency syndrome.
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