A patient with chronic gastritis is found to have no hydrochloric acid in their gastric juice (achlorhydria). This condition would most significantly impair the activation of which enzyme?

A 50-year-old male with a history of alcohol abuse presents with severe epigastric pain radiating to the back. Serum amylase and lipase are elevated. What is the diagnosis?

A child with foul-smelling, fatty stools (steatorrhea) and recurrent respiratory infections is diagnosed with cystic fibrosis. The primary biochemical defect involves which of the following?

During the secretion of HCl in parietal cells, which ion is pumped into the gastric lumen in exchange for potassium (K+)?

A patient presents with right upper quadrant pain after fatty meals. An ultrasound reveals gallstones. This condition (cholelithiasis) is often due to an imbalance in the concentration of which substances?

Which enzyme in the succus entericus is responsible for activating pancreatic zymogens by converting trypsinogen to trypsin?

A 20-year-old student experiences bloating, gas, and diarrhea after consuming dairy products. The deficiency of which enzyme is responsible?

Which glucose transporter (GLUT) is insulin-dependent and found primarily in muscle and adipose tissue?

The SGLT-1 transporter moves glucose into intestinal mucosal cells against a concentration gradient using the energy from which source?

In aerobic glycolysis, the net yield of ATP per molecule of glucose is:

A patient presents with chronic hemolytic anemia. Biochemical analysis shows a deficiency in a glycolytic enzyme that converts phosphoenolpyruvate to pyruvate. Which enzyme is deficient?

Which hormone increases during fasting to stimulate glycogenolysis and gluconeogenesis?

The rate-limiting enzyme of glycolysis is:

In anaerobic conditions (like exercising muscle), pyruvate is reduced to lactate by NADH. This reaction is essential to regenerate which molecule?

Which complex is responsible for the oxidative decarboxylation of pyruvate to acetyl-CoA?

How many molecules of NADH are produced during one turn of the TCA (Krebs) cycle?

The conversion of pyruvate to oxaloacetate in gluconeogenesis requires which cofactor?

The Cori cycle involves the transport of lactate from muscle to the liver, where it is converted back to which compound?

Which substrate provides the carbon skeleton for glucose synthesis during prolonged starvation via the glucose–alanine cycle?

Which enzyme in the TCA cycle is also a part of the electron transport chain (Complex II)?

Fluoroacetate is a potent inhibitor of the TCA cycle. It inhibits which enzyme?

High levels of acetyl-CoA act as an allosteric activator for which gluconeogenic enzyme?

Arsenic poisoning affects the pyruvate dehydrogenase complex and alpha-ketoglutarate dehydrogenase by binding to which cofactor?

A 6-month-old infant presents with hepatomegaly and severe fasting hypoglycemia. A liver biopsy shows an inability to dephosphorylate glucose-6-phosphate (Von Gierke's disease). This is glycogen storage disease (GSD) type:

Which glycogen storage disease is characterized by painful muscle cramps during exercise and the absence of muscle phosphorylase (McArdle’s disease)?

The primary purpose of the hexose monophosphate (HMP) shunt is to produce:

A patient with G6PD deficiency develops hemolytic anemia after taking primaquine (an antimalarial). This occurs because red blood cells cannot maintain adequate levels of which molecule?

Which enzyme in the HMP shunt requires thiamine pyrophosphate (TPP) and is used clinically to assess thiamine status?

Which pathway is responsible for the formation of cataracts in diabetic patients due to accumulation of sorbitol?

In the uronic acid pathway, humans cannot synthesize vitamin C (ascorbic acid) because they lack which enzyme?

Glycogenolysis in the liver is stimulated by glucagon via which second messenger?

Chronic ethanol consumption leads to a high NADH/NAD+ ratio. This favors the conversion of pyruvate to:

Fatty liver (steatosis) in alcoholics occurs because high NADH inhibits:

The component of the electron transport chain that is a mobile electron carrier between Complex III and IV is:

Cyanide and carbon monoxide (CO) inhibit the electron transport chain by binding to:

An uncoupler like 2,4-dinitrophenol (DNP) causes:

Oligomycin inhibits ATP synthesis by:

Which shuttle system for reducing equivalents yields more ATP (approximately 2.5 per NADH)?

The chemiosmotic hypothesis states that ATP is produced as H+ ions flow from the:

A child presents with edema, thinned hair, and a "flaky paint" dermatosis, despite having a relatively normal caloric intake but very low protein. This is:

A 1-year-old child appears "skin and bones" with severe muscle wasting and no edema. This is characteristic of:

A BMI (Body Mass Index) of $$32 \ \text{kg/m}^2$$ is classified as:

Which type of obesity is associated with a higher risk of metabolic syndrome and cardiovascular disease?

Basal metabolic rate (BMR) is generally higher in:

What is the energy content of 1 gram of alcohol?

A patient with gluten enteropathy (celiac disease) must avoid:

During pregnancy, the daily caloric requirement typically increases by approximately how many kcal in the second trimester?

Dietary fiber is recommended in patients with hemorrhoids because it:

Which of the following is a macronutrient?

The committed step in purine synthesis is catalyzed by:

The parent purine nucleotide from which both AMP and GMP are derived is:

A 5-year-old boy shows self-mutilation (biting lips/fingers), hyperuricemia, and intellectual disability. He likely lacks which enzyme?

Severe Combined Immunodeficiency (SCID) is most commonly associated with a deficiency in:

Gout is caused by the accumulation of crystals of:

Allopurinol treats gout by inhibiting which enzyme?

Orotic aciduria (Type I) results from a deficiency in UMP synthase. It is characterized by megaloblastic anemia and is a disorder of:

The drug methotrexate inhibits which enzyme, thereby reducing the availability of THF for nucleotide synthesis?

5-Fluorouracil (5-FU) is a pyrimidine analog that primarily inhibits:

Which enzyme reduces ribose to deoxyribose for DNA synthesis and is inhibited by hydroxyurea?

CPS-II (Carbamoyl Phosphate Synthetase II) is involved in pyrimidine synthesis and is located in the:

Mycophenolic acid acts as an immunosuppressant by inhibiting the synthesis of:

A patient with uncontrolled diabetes mellitus presents with Kussmaul breathing and a blood pH of 7.25. This is:

The primary compensatory mechanism for metabolic acidosis is:

Which of the following causes respiratory acidosis?

A patient with severe prolonged vomiting is likely to develop:

The anion gap is calculated as:

In a patient with alkalosis, the decrease in ionized calcium levels can lead to:

Hyperventilation due to a panic attack leads to which acid–base disturbance?

The normal ratio of bicarbonate to dissolved carbon dioxide in blood at pH 7.4 is:

A chronic alcoholic presents with hypoglycemia. The high NADH/NAD+ ratio inhibits gluconeogenesis by pushing which reaction toward the product?

A patient has pCO2 = 60 mmHg (normal ≈ 40) and pH = 7.2. This is:

In the malate–aspartate shuttle, which amino acid is used to transport nitrogen back to the cytosol?

Which enzyme deficiency causes a "mousy odor" to urine and intellectual disability?

A patient is diagnosed with high-altitude sickness. The body compensates for the resulting respiratory alkalosis by:

Which of the following is an inhibitor of Complex I of the electron transport chain?

A patient with a high-protein diet will have increased activity of which cycle to dispose of nitrogen?

Glucose-6-phosphate dehydrogenase (G6PD) deficiency follows what inheritance pattern?

What is the effect of insulin on glycogen synthase?

In pyruvate dehydrogenase (PDH) deficiency, the buildup of pyruvate leads to its conversion into: