📝 Step 5 — KMU Past Papers & Exam Learning
This section contains KMU-style past paper questions designed to strengthen conceptual understanding. Focus on understanding explanations rather than memorizing answers.
🎯 How to Study KMU Past Papers
- Read the question carefully.
- Think about the answer before looking.
- Read the explanation slowly.
- Understand the reasoning behind the correct answer.
- Revise difficult questions again.
MCQ 1
Question:
A patient with uncontrolled type 1 diabetes mellitus develops marked hyperglycemia despite reduced glucose uptake in skeletal muscle. Which hepatic process contributes most directly to this hyperglycemia?
Options:
Increased glycogenesis in hepatocytes
Increased gluconeogenesis in liver
Decreased lipolysis in adipose tissue
Reduced glycogenolysis in muscle
Reduced glycolysis in red blood cells
Correct Answer:
Increased gluconeogenesis in liver
Explanation:
Insulin deficiency fails to suppress hepatic gluconeogenesis, leading to continued glucose production despite hyperglycemia.
MCQ 2
Question:
During prolonged fasting, maintenance of blood glucose becomes increasingly dependent on which substrate derived from adipose tissue?
Options:
Acetyl-CoA
Lactate
Alanine
Glycerol
Pyruvate
Correct Answer:
Glycerol
Explanation:
Adipose tissue lipolysis releases glycerol, which serves as an important substrate for gluconeogenesis during prolonged fasting.
MCQ 3
Question:
A child develops hypoglycemia and hepatomegaly due to inability to mobilize hepatic glycogen. Which pathway is primarily impaired?
Options:
Glycolysis
Pentose phosphate pathway
Glycogenolysis
Lipogenesis
Ketogenesis
Correct Answer:
Glycogenolysis
Explanation:
Defects in glycogen breakdown impair hepatic glucose release during fasting, causing hypoglycemia and glycogen accumulation.
MCQ 4
Question:
Which tissue continues to require glucose even during prolonged starvation because of absence of mitochondria?
Options:
Cardiac muscle
Hepatocytes
Renal cortex
Red blood cells
Adipose tissue
Correct Answer:
Red blood cells
Explanation:
RBCs lack mitochondria and therefore depend entirely on anaerobic glycolysis for ATP production.
MCQ 5
Question:
A patient develops severe confusion after prolonged fasting. Which physiological event most directly explains this neurological manifestation?
Options:
Reduced glycogen storage in adipose tissue
Reduced ATP generation in hepatocytes
Reduced glucose availability to neurons
Reduced fatty acid oxidation in muscle
Reduced ketone synthesis in liver
Correct Answer:
Reduced glucose availability to neurons
Explanation:
The brain depends heavily on glucose, and severe hypoglycemia impairs neuronal ATP production causing neuroglycopenic symptoms.
MCQ 6
Question:
Following a carbohydrate-rich meal, which metabolic event occurs predominantly in hepatocytes under insulin influence?
Options:
Activation of gluconeogenesis
Activation of glycogenesis
Activation of ketogenesis
Activation of glycogenolysis
Activation of lipolysis
Correct Answer:
Activation of glycogenesis
Explanation:
Insulin promotes glycogen synthesis in the liver during the fed state for glucose storage.
MCQ 7
Question:
A marathon runner rapidly mobilizes glycogen stores during intense exercise. Which hormone is primarily responsible for this immediate metabolic adaptation?
Options:
Insulin
Cortisol
Adrenaline
Thyroxine
Aldosterone
Correct Answer:
Adrenaline
Explanation:
Adrenaline stimulates glycogen breakdown in liver and muscle during stress and exercise to provide rapid energy.
MCQ 8
Question:
Which metabolic feature explains why skeletal muscle cannot directly maintain blood glucose during fasting?
Options:
Absence of glycogen synthase
Absence of GLUT-4 transporters
Absence of glucose-6-phosphatase
Absence of phosphofructokinase
Absence of glycogen phosphorylase
Correct Answer:
Absence of glucose-6-phosphatase
Explanation:
Skeletal muscle lacks glucose-6-phosphatase and therefore cannot release free glucose into circulation.
MCQ 9
Question:
A patient with pyruvate kinase deficiency develops chronic hemolytic anemia. Which biochemical abnormality is most directly responsible?
Options:
Reduced glycogen synthesis in RBCs
Reduced ATP production in RBCs
Reduced ketone body utilization
Reduced glucose absorption from intestine
Reduced gluconeogenesis in liver
Correct Answer:
Reduced ATP production in RBCs
Explanation:
RBCs rely completely on glycolysis for ATP; pyruvate kinase deficiency decreases ATP and causes membrane instability.
MCQ 10
Question:
Which metabolic pathway becomes most active in liver after depletion of glycogen stores during fasting?
Options:
Glycogenesis
Glycolysis
Lipogenesis
Gluconeogenesis
Pentose phosphate pathway
Correct Answer:
Gluconeogenesis
Explanation:
After hepatic glycogen depletion, gluconeogenesis becomes the major mechanism for maintaining blood glucose.
MCQ 11
Question:
A patient with insulin resistance has elevated blood glucose despite adequate insulin secretion. Which cellular event is most likely impaired?
Options:
GLUT-4 mediated glucose uptake
Mitochondrial beta oxidation
Ketone body formation
Protein digestion
Lysosomal degradation
Correct Answer:
GLUT-4 mediated glucose uptake
Explanation:
Insulin resistance impairs GLUT-4 mediated glucose uptake in muscle and adipose tissue, contributing to hyperglycemia.
MCQ 12
Question:
Which tissue primarily stores glycogen for maintenance of systemic glucose homeostasis rather than local energy use?
Options:
Skeletal muscle
Cardiac muscle
Adipose tissue
Liver
Brain
Correct Answer:
Liver
Explanation:
Hepatic glycogen is used to maintain blood glucose levels for the entire body during fasting.
MCQ 13
Question:
During fasting, increased glucagon secretion produces which direct hepatic effect?
Options:
Increased glycogen synthesis
Increased glucose oxidation
Increased glycogen breakdown
Increased fatty acid synthesis
Increased protein synthesis
Correct Answer:
Increased glycogen breakdown
Explanation:
Glucagon stimulates hepatic glycogenolysis to increase blood glucose during fasting.
MCQ 14
Question:
A patient develops recurrent fasting hypoglycemia due to impaired gluconeogenesis. Which organ dysfunction would most strongly contribute to this condition?
Options:
Spleen dysfunction
Hepatic dysfunction
Thyroid dysfunction
Pancreatic exocrine dysfunction
Bone marrow dysfunction
Correct Answer:
Hepatic dysfunction
Explanation:
The liver is the primary site of gluconeogenesis and is essential for maintaining blood glucose during fasting.
MCQ 15
Question:
Which metabolic adaptation helps preserve blood glucose for brain and RBC function during prolonged fasting?
Options:
Increased glycogenesis
Increased ketone body utilization by peripheral tissues
Increased lipogenesis
Increased glycogen synthesis in muscle
Increased glucose uptake in adipose tissue
Correct Answer:
Increased ketone body utilization by peripheral tissues
Explanation:
Peripheral tissues begin using ketone bodies during starvation, helping conserve glucose for brain and RBCs.
MCQ 16
Question:
After administration of insulin to a diabetic patient, which metabolic change occurs first in skeletal muscle?
Options:
Increased glycogenolysis
Increased glucose uptake
Increased gluconeogenesis
Increased ketogenesis
Increased cortisol secretion
Correct Answer:
Increased glucose uptake
Explanation:
Insulin rapidly promotes GLUT-4 translocation, increasing glucose uptake into skeletal muscle cells.
MCQ 17
Question:
A patient with severe liver disease develops fasting hypoglycemia because of reduced ability to perform which integrated metabolic functions?
Options:
Lipogenesis and ketogenesis
Glycolysis and glycogenesis
Glycogenolysis and gluconeogenesis
Protein synthesis and glycolysis
Ketogenesis and beta oxidation
Correct Answer:
Glycogenolysis and gluconeogenesis
Explanation:
The liver maintains fasting blood glucose through glycogen breakdown and glucose synthesis.
MCQ 18
Question:
Which metabolic relationship best explains the reciprocal regulation of glycolysis and gluconeogenesis?
Options:
Both pathways are maximally active simultaneously
One pathway is activated while the other is suppressed
Both pathways occur only in adipose tissue
Both pathways depend equally on glucagon
One pathway occurs only during exercise
Correct Answer:
One pathway is activated while the other is suppressed
Explanation:
Reciprocal regulation prevents futile cycling and conserves energy during metabolic state transitions.
MCQ 19
Question:
A fasting individual develops increased hepatic glucose output. Which hormonal pattern is most likely present?
Options:
High insulin with low glucagon
Low insulin with high glucagon
High insulin with high cortisol
Low glucagon with high insulin
Low adrenaline with high insulin
Correct Answer:
Low insulin with high glucagon
Explanation:
The fasting state is characterized by decreased insulin and increased glucagon, promoting hepatic glucose release.
MCQ 20
Question:
Which integrated metabolic response occurs in skeletal muscle during intense exercise?
Options:
Increased glycogenesis with reduced glycolysis
Increased glycolysis with glycogen breakdown
Increased gluconeogenesis with glycogenesis
Increased lipogenesis with ketogenesis
Increased glucose release into blood
Correct Answer:
Increased glycolysis with glycogen breakdown
Explanation:
During exercise, skeletal muscle breaks down glycogen and increases glycolysis to rapidly generate ATP for contraction.
📌 Important Exam Strategy
KMU examinations often test integrated understanding rather than isolated facts. Focus on linking anatomy, embryology, histology, and clinical concepts when reviewing questions.
✅ Revision Tip
If you can explain the reason behind the correct answer without looking at notes, your concept is strong.