5. Treatment of the patients with familial hypercholesterolemia by statins(pravastatin, for instants) allows to decrease cholesterol levels in blood up to thenormal range. Explain the statin action on the cholesterol metabolism. For that:a) draw the scheme of the cholesterol synthesis, indicate the key enzyme of thepathway;b) name all mechanisms of the key enzyme regulation and statin's action;c) describe the structure of LDL receptor and its function in cholesterolmetabolism;d) explain the cause of familial hypercholesterolemia and the symptoms of thedisease.

Familial hypercholesterolemia is an autosomal dominant condition. It is linked to early…

Answered: 5. Treatment of the patients with…

Biochemistry

9th Edition

ISBN:9781319114671

Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Chapter1: Biochemistry: An Evolving Science

Section: Chapter Questions

Problem 1P

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8. In patients after prolonged hepatitis, the ALT and AST activities were measured in the blood serum. What transaminase activity is inereased to a greater extent, and why? For the answer: a) explain the meaning of the enzyme diagnostics; b) draw the scheme of reactions catalyzed by ALT and AST; c) point out coenzyme of these reactions; describe vitamin from which this cocnzyme is derived; d) describe the biological importance of this type of reactions in amino acid metabolism; e) specify the demands which are claimed to enzymes been used in enzyme diagnostics.
3. A patient has got excess carbohydrate meal for the years and gain the weight. To explain this: a) draw the schemes of TAG synthesis in the liver; b) describe the transport of TAG from the liver to adipose tissue; c) describe the functions of insulin in the conversion of glucose to TAG in the liver and adipose tissue. Glucose containing Catoms was added to isolated hepatocytes inanexperiment. Ifthe glucose was added in excess, the rate of triacylglyccrol synthesis increased.
1. Discuss why a saturated fatty acid like lauric acid has a good anti-oxidant property. 2. Why are the essential fatty acid associated with low incidence of heart disease? Cite some clinical signs of essential fatty acid deficiency. 3. Explain how aspirin can block the synthesis of prostaglandins?
8. Hypercholesterolemia is a frequent complication of diabetes mellitus in patients with prolonged hyperglycemia. Why a high level of glucose in blood causes hypercholesterolemia and atherosclerosis? For the answer explain: a) how glucose can interact with the proteins and the consequences of this reaction for the proteins; b) glycation of which proteins results in hypercholesterolemia; c) possible causes and complications of hypercholesterolemia.
6. In an experiment, students used liver tissuc samples to study the cthanol metabolism and the possibility of ethanol conversion into glucose. The ethanol introduction in the investigated medium didn't lead to glucose level increase. Why is it impossible to convert ethanol to glucose? For the answer: a) provide a scheme of gluconcogenesis, indicate the substrates of this process; b) write the reaction of ethanol oxidation in the liver; c) explain whether it is possible to use the metabolites of ethanol catabolism for the glucose synthesis.
3. After 12 days of starvation, a man reduced his weight by 4 kg. The doctor prescribed him biochemical blood test to analyze the level of lipids in serum blood. The results showed an elevated level of free fatty acids and triacylglycerols. Explain the results of the biochemical blood test. For that: a) name the main hormone which manages metabolism during starvation; b) draw the scheme of this hormone action on the adipose tissue; c) name the possible pathways of fatty acids usage in the liver during starvation and write down the proper schemes.
(c) Discuss the mechanism of action of the enzyme chymotrypsin.
5. During prolonged fasting, amino acids derived from muscle proteins and connective tissue become the main substrate for gluconcogenesis. How does glutamate enter the gluconeogenesis? For answer: a) write a reaction of the glutamate conversion into a-ketoglutarate, name the enzyme, indicate the encrgy effect of the reaction; b) draw a diagram for the a-ketoglutarate conversion to oxaloacetate and consequent including of OAA to gluconcogenesis, specify the reactions associated with ATP consumption; c) name the hormones that accelerate gluconeogenesis during fasting and regulatory enzymes of the process; and describe the mechanism of signal transduction by these hormones.
1. Briefly explain why an individual with Aldolase B deficiency will suffer from hypoglycemia upon ingestion of fructose. Make sure to mention the affected pathways and explain why these are affected. 2. Briefly explain the mechanism involved when an individual with glucose 6-phosphate dehydrogenase deficiency develops an episode of hemolytic crisis after eating fava beans. Make sure to mention pathways and enzymes involved.
8. In patients with diabetes mellitus type I, the biochemical disorders result from changes in fucl metabolism. One of these signs is acidosis. Explain why such patients have a deviation of blood pH from the norm? For this me the Ocuics, name d) specify the hormone that accelerates this preeursor formation and provide appropriate charts, starting from the hormone binding to adipocyte and concluding with precursor formation, give an explanation to the charts.
B) Read the situations below and indicate which of the four methods of enzyme regulation is occurring for each. a) The energy-carrying molecule ATP is made by the enzyme ATP synthase. Muscle cells use a lot of energy and also have higher amounts of the ATP synthase enzyme than many ouier cem types. General mechanism of enzyme regulation: /1 b) Prostaglandins are messenger molecules involved in the inflammatory response, as well as th perception of pain. They are synthesized from polyunsaturated fatty acid substrates by an enzyn called cyclo-oxygenase. "Ibuprofen" is the active ingredient in a variety of anti-inflammatory medications such as Motrin® and Advil®. It reduces pain and swelling by binding to a hydrophobic channel in the active site of cyclo-oxygenase, blocking the polyunsaturated fatty acids from binding to the enzyme, and therefore stopping production of prostaglandins. General mechanism of enzyme regulation: a) In point form, describe the steps by which ATP is produced…
8. The adipose tissue is not only store triacylglycerols but also is active endocrine organ. Explain this function of the adipose tissuc. For that: a) explain the «clinical obesity» and possible consequences of the discase; b) name the biologically active molecules secreted by the adipose tissue; c) explain how secretion of these molecules changes with development of obesity. 9. A daily dict ofa 55-ycar-old woman, consisted ofa 500 g of carbohydrates, 100g of animal fats and 150 g of proteins, at the background of low physical activity.

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