1) A 30-year-old man has been fasting for religious reasons for several days. His brain has reduced its need for glucose by using which of the following substances as an alternative source of energy? A.Fatty acids B.Beta-hydroxybutyrate C.Glycerol D.Beta carotene E. Alanine 2) A 7-year-old girl is brought to the emergency department by her parents […]
Carbohydrate metabolism- Problem based MCQs Read More »
Q.1- Which of the following is an important glycogen storage site? A) Adipose tissue B) Cardiac muscle C) Spleen D) Kidney E) Liver. Q.2- Which of the following is an active form of glucose to initiate the process of glycogenesis? A) Adenosyl Glucose B) UDP glucose C) AMP Glucose D) Glucose-6-Phosphate E) Glucose-1-P Q.3- Choose
Metabolism of Glycogen, Glycogen storage diseases and Diabetes mellitus- Solved MCQs 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) Which of these enzyme reactions is not irreversible in glycolysis? a) Hexokinase b) Glucokinase c) 3-phosphoglycerate kinase d) Phosphofructokinase-1 e) Pyruvate kinase 2) Which of the following statements is not true about aerobic glycolysis? a) The rate-limiting enzyme is phosphofructokinase-1 which converts fructose-6- phosphate to fructose-1,6-bisphosphate b) The pathway is activated allosterically by fructose-2,6-bisphosphate
Carbohydrate metabolism-Practice 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- Which of the following is a common compound shared by the TCA and Urea cycles? a) α- Ketoglutarate b) Succinyl CoA c) Oxaloacetate d) Fumarate Q.2-Which of the following is a common nitrogen acceptor for all reactions involving transaminases? a) α- Ketoglutarate b) Pyruvate c) Oxaloacetate d) Acetoacetate Q.3- In a 55- year-old man
Amino Acid Metabolism-Multiple-choice questions (set-2) Read More »
Q.1- A 12 -year-old boy develops convulsions. After running an Electroencephalogram(EEG), a neurologist determines that the child has epilepsy. He is started on benzodiazepine, which promotes the activity of GABA. GABA is derived from Glutamate by which of the following reactions? a) Transamination b) Decarboxylation c) Deamination d) Hydroxylation e) Dehydrogenation Q.2- A couple of
Amino acid metabolism-Multiple-choice questions (set-1) Read More »
Q.1- Which statement best describes the ‘semi-conservative replication’ of DNA? A) In each replication cycle, only one of the two DNA strands is replicated B) In each replication cycle, one of the parental strands is conserved C) In each replication cycle, the daughter cells acquire either the parental stands or new stands D) Only half
Molecular Biology-Multiple-choice questions (set-2) Read More »
