A 32-year-old bodybuilder has decided to go on a diet consisting of egg whites to ensure only proteins for muscle growth. After a few weeks, he experiences decreased energy and is found to be hypoglycemic. A nutritionist tells the patient that he most likely has a deficiency of vitamin Biotin. Which of the following enzymes […]
Hypoglycemia Due To Biotin deficiency Read More »
1) A 24-year-old woman presents with diarrhea, dysphagia, jaundice, and white transverse lines on the fingernails (Mee’s lines). The patient is diagnosed with Arsenic poisoning, which inhibits which of the following enzymes? a) Citrate synthase b) Isocitrate dehydrogenase c) α-Keto glutarate dehydrogenase complex d) Succinate dehydrogenase e) Malate dehydrogenase 2) A biochemistry graduate student isolated
TCA Cycle- Multiple-choice questions Read More »
1) Glucose breakdown in certain mammalian and bacterial cells can occur by mechanisms other than classic glycolysis. In most of these, glucose 6-phosphate is oxidized to 6- 6-phosphogluconate, which is then further metabolized by: a) an aldolase-type split to form glyceric acid and glyceraldehyde 3-phosphate. b) an aldolase-type split to form glycolic acid and erythrose
Multiple-choice questions- Pentose phosphate pathway Read More »
1) A 4-month-old boy is being evaluated for seizures, psychomotor retardation, and hypotonia. Workup reveals elevated serum levels of lactate, alanine, pyruvate, and keto acids. Based on the clinical presentation, pyruvate carboxylase activity is measured using fibroblasts from a skin biopsy and is found to be markedly decreased. This enzyme is normally used to directly
Gluconeogenesis- Multiple-choice questions Read More »
1). A patient has chronic obstructive pulmonary disease, and enough oxygen is not reaching her tissues. All of the following are expected except- a) The electron transport chain would be inhibited b) Glycolysis would be activated by a low ATP/ADP ratio c) More than normal amounts of ATP would be synthesized. d) Concentrations of NADH and
Glycolysis- Multiple-choice questions (set-1) Read More »
Q.1- Choose a site along the electron transport chain out of the following that is not coupled to ATP synthesis: a) NADH- coenzyme Q (CoQ) reductase b) Succinate-Co Q reductase c) Cytochrome bc1 reductase d) Cytochrome oxidase e) None of the above. Q.2- Choose a statement out of the following that best describes the uncouplers
