8/14/2019 _~R 314, Exam.

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_ ~   314, Exam. <

1. Which e a z : - = ~   :: :-e i Ie for taking TG from circulation to muscle and adipose

tissues? \ 2: : ~   :- 0 that liver can not take TG from chylomicron? Why can liver

take lipi '- 2 C ' ~   :_::. mi ron remnants? Please describe the fate of chylomicron in detail.

You can ~ w  g:c. h 0 help your explanation. (Total 10 points)

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2. Please describe the endocytosis process after LDL binds to LDL receptor on cell

membrane in detail. What are the fates of lipids, apolipoproteins, and LDL? (Total 10 I J

points) I \ ... \ I l " .

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NTR 314, Exam if3

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3. Which organ synthesizes high density lipoprotein? :What are the k e Y J 2 r o 1 2 e ~ . ! i c s   of HDL

that m e d i ~ i ~ s - r ~ v e r _ ~   c h o l ~ s t e r o l   transport? Please describe the reyerse_ cholesterol

transport in detail. You should draw a graph to explain each step. (Total 12 poillts)- - \ \ ( \ r . ( ,. ,t '. f ,

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\ L ,4. What is the reaction catalyzed by acyl CoA carboxylase (ACC)? Please describe the

reaction including substrates, and products. How does citrate affect its activity? (Total 4points) , t

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5. What is the reaction catalyzed by fatty acyl CoA synthetase'? How many high encrgy/,-lbonds does this reaction consume? (TotalS points)

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_TTR 314, Ex ._ : -  

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number of ATP (In, 5, ar.ld G)'EBotal 6 poin )tI ,,(; I ', ,

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7. How do short/median- and long-chain fatty acids enter into mitochondria for beta

oxidation? _What is the transport system that is responsible for moving long chain fatty

acyl eoA across-mitochondrial membrane? What are the components and reactions in

this system? What is the role of malonyl eoA on this system? (Total 10 points)

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NTR 314, Exam #3

8. What are the ketone bodies? Which ones are acid? What is the source or ketone body

production? (Total 8 points)

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9. The formation of nearly all the acetyl CoA occurs in the mitochondria. What are the

sources for production of acetyl CoA? Acetyl CoA cannot pass through the

mitochondrial membrane. What is the pathway that mediates the transport of acetyl CoA

from mitochondria to cytoplasm? Please describe the process, including intermediate

metabolites, reaction, and enzyme mediating this reaction. (Total 12 points)

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_-TR 314, Exam -:3

10. Why arc linol ic acid (18:2 69, 12) and a-linolenic acid (18:3 69, 12, 15) essential

fallyacids') Yhic 1 onc is n-3 ((1)3) or n-6 (m6) fatty acid? What are the sources of

essential I ~ l t t y   acids') (TotalS points)

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1 1 ~ I - 0 ' : Y _ n m n y   carbon atoms are there in eicosanQids? Which poly unsaturated fatty acidis the most important one servinQ as precursor for eicosanoid synthesis?/What are the

eicosanoids tbat have potent p b y ~ i o l o g j c a l  activity? What are the pathway; a n ~ ; z y r n e s  that lead to their synthesis? (Total 12 points)

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TTR 314, Exam #3

12. \Vhat are the three stages of cholesterol biosy1hesis? Please descri be theill. YOll

should draw a graph to help your explanation. (Total 6 points)

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