Category: Biochemistry of Digestion

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Vitamin deficiency in cystic fibrosis

Case details A 30-month-old female child whose growth rate has been in the lower 10th percentile over the last year presents with chronic, nonproductive cough and diarrhea with foul-smelling stools. She is diagnosed as having cystic fibrosis (figure-1). For which of the following vitamins is this child most likely to be at risk of deficiency? A. Ascorbic acid (vitamin C) B. Biotin C. Folic acid D. Retinol (vitamin A) E. Riboflavin (vitamin B2) Answer- D. Because cystic fibrosis leads to pancreatic damage and diminution of the ability to secrete HCO3 ions and pancreatic digestive enzymes with the result that fat...

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Absorption of dietary glucose

A 45-year-old morbidly obese woman has been attempting to lose weight using a low- carbohydrate diet. After 2 months of little success, she confides in her son that she does add glucose to her coffee in the morning and after dinner but feels only some of this will be absorbed and should not be the cause of her limited success. Her son, a medical student, states that glucose is almost completely absorbed from the gut. What type of transport does glucose utilize for gastro intestinal absorption? A. Active- Carrier mediated, against the concentration gradient and energy dependent B. Facilitated- Carrier...

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Case study- Lactose Intolerance

Case details A 30- year-old Asian male presents with bloating, abdominal cramps, and diarrhea. He states that he develops these symptoms whenever he drinks milk or eat dairy products. He is diagnosed with lactose intolerance, a common condition in which lactose is not digested normally and accumulates in the gut. Lactase converts lactose into : A. Two glucose molecules B. Glucose and Fructose C. Glucose and Galactose D. Fructose and Galactose E. Sucrose and Maltose Answer- The correct answer is C- Glucose and galactose. Lactose is a disaccharide made up of Galactose and glucose residues  linked together by beta 1-4...

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Case study- Lactose intolerance

QUESTION OF THE DAY A 30- year-old Asian male presents with bloating, abdominal cramps, and diarrhea. He states that he develops these symptoms whenever he drinks milk or eat dairy products. He is diagnosed with lactose intolerance, a common condition in which lactose is not digested normally and accumulates in the gut. Lactase converts lactose into : A. Two glucose molecules B. Glucose and Fructose C. Glucose and Galactose D. Fructose and Galactose E. Sucrose and Maltose For answer- follow the link http://usmle.biochemistryformedics.com/answer-case-study-lactose-intolerance/   Please help Biochemistry for Medics by “CLICKING ON THE ADVERTISEMENTS” every time you visit us. Thank...

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Case study- Achlorhydria (Discussion)

A 65- year-old woman is evaluated by a gastroenterologist for progressive signs and symptoms of malnutrition. Throughout her work up, she is found to have significantly decreased stomach acid. She is also found to have antibodies to gastric parietal cells, which are normally responsible for the production of acid. Why is hydrochloric acid important in digestion? A. It stimulates the cleavage of trypsinogen to trypsin B. It is required for the activity of ╬▒- Amylase C. It converts pepsinogen to pepsin D. It is required for lipid digestion E. It drives the secondary transport of amino acids Answer- The correct...

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Case study- Achlorhydria-A 65- year-old woman is evaluated by a gastroenterologist

Question of the day A 65- year-old woman is evaluated by a gastroenterologist for progressive signs and symptoms of malnutrition. Throughout her work up, she is found to have significantly decreased stomach acid. She is also found to have antibodies to gastric parietal cells, which are normally responsible for the production of acid. Why is hydrochloric acid important in digestion? A. It stimulates the cleavage of trypsinogen to trypsin B. It is required for the activity of ╬▒- Amylase C. It converts pepsinogen to pepsin D. It is required for lipid digestion E. It drives the secondary transport of amino...

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