All Free Biochemistry MCQs with Answers

• A. All of the above statements are true
• B. The hydrolysis of maltose yields glucose and fructose
• C. The hydrolysis of sucrose yields only glucose
• D. The hydrolysis of lactose yields glucose and galactose

Explanation: Lactose is a disaccharide of glucose and galactose, so hydrolysis releases these two monosaccharides.

• A. Cortisone
• B. Insulin
• C. GH
• D. Epinephrine

Explanation: Insulin promotes glucose uptake and activates glycogen synthase, directing excess glucose into glycogen.

• A. Pentoses
• B. Disaccharides
• C. Hexoses
• D. Polysaccharides

Explanation: Hexoses such as glucose and galactose are absorbed rapidly as monosaccharides after digestion.

• A. Phosphoglutamase
• B. Branching enzyme
• C. Debranching enzyme
• D. Glucose-6-phosphotase

Explanation: Muscle lacks glucose-6-phosphatase, the enzyme needed to convert glucose-6-phosphate into free glucose for release into blood.

• A. Skeletal muscle
• B. Kidney
• C. Liver
• D. Cardiac muscle

Explanation: Skeletal muscle contains the greatest total amount of glycogen because total muscle mass is much larger than liver mass.

• A. Glycogen
• B. Ribosome
• C. Golgi body
• D. Endoplasmic reticulum

Explanation: Cytoplasmic inclusions are stored or accumulated materials that are not true membrane-bound organelles; glycogen is a classic example.

• A. Energy
• B. Utility
• C. None of the above
• D. Collectivity

Explanation: The glycemic index measures the rise in blood glucose after eating a carbohydrate-containing food, compared with a reference food.

• A. Proteins
• B. Carbohydrates
• C. Fat
• D. Fibre rich diet

Explanation: A fibre-rich diet is preferred in type 2 diabetes because soluble fibre slows glucose absorption and improves post-meal glycemic control.

• A. 80 mg%
• B. 100 mg%
• C. 180 mg/ dl
• D. 200 mg%

Explanation: The renal threshold for glucose is about 180 mg/dL, above which the renal tubules cannot reabsorb all filtered glucose and glucosuria may…

• A. Urea
• B. Creatine
• C. glucose
• D. None of the aboveFind Chemistry Tutors

Explanation: Glucose is normally almost completely reabsorbed by the renal tubules and is absent from urine, except when blood glucose exceeds the…

• A. Glucose 1 phosphatase
• B. Glucose 1,6 phosphatase
• C. Glucose 6 phosphatase
• D. Myophosphorylase

Explanation: McArdle disease is caused by deficiency of muscle glycogen phosphorylase, also called myophosphorylase.

• A. Cytochrome P-450
• B. Glutathione S-transferase
• C. NADPH cytochrome P-450 reductase
• D. Glucuronyl transferase

Explanation: Cytochrome P-450 carries out the major Phase I oxidation reactions that activate or modify many xenobiotics.

• A. Gaucher's disease
• B. Zellweger's syndrome
• C. Epidermolysis bullosa
• D. Leber's neuropathy

Explanation: Zellweger syndrome results from defective peroxisome formation or function, causing accumulation of very-long-chain fatty acids and…

• A. Alkaline phosphatase
• B. SGOT
• C. CPK
• D. SGPT

Explanation: Creatine phosphokinase, now called creatine kinase, is abundant in skeletal muscle and is released after muscle injury.

• A. CPK
• B. LDH
• C. SGOT
• D. Amylase

Explanation: Creatine phosphokinase, now called creatine kinase, is among the earliest listed enzymes to rise after myocardial infarction, usually…

• A. MM fraction
• B. MB fraction
• C. BB fraction
• D. Both MM and BB fraction

Explanation: CK-MB is the creatine kinase isoenzyme relatively concentrated in cardiac muscle, so it rises after myocardial infarction.

• A. Glutamate oxaloacetate transaminase
• B. Glutamate pyruvate transaminase
• C. Alkaline phosphaase
• D. Acid phosphatase

Explanation: Alkaline phosphatase is markedly increased in cholestasis and obstructive jaundice because bile obstruction enhances its release from the…

• A. Deficiency of glutamic acid
• B. Deficiency of oxaloacetic acid
• C. All of the above
• D. Liver disease

Explanation: SGOT, now called AST, rises in liver injury, although it is not liver-specific and can also increase in cardiac or skeletal muscle damage.

• A. Haemoglobin
• B. A & B
• C. Gall bladder
• D. Myoglobin

Explanation: Bilirubin is formed when heme from haemoglobin and other haemoproteins, including myoglobin, is degraded.

• A. All of the above
• B. Chenodeoxycholic acid
• C. Deoxycholic acid
• D. Lithocholic acid
• E. Cholic acid

Explanation: Bile contains primary bile acids such as cholic and chenodeoxycholic acids, along with secondary bile acids such as deoxycholic and…