All Free Biochemistry MCQs with Answers

• A. Cholesterol
• B. Leucine
• C. Ketone bodies
• D. Bile acids

Explanation: HMG-CoA is an intermediate in cholesterol synthesis and ketogenesis, and it can also arise during leucine catabolism.

• A. Acetyl CoA
• B. Acetic acid
• C. Oxalo acetic acid
• D. PyruvateFind Chemistry Tutors

Explanation: Acetyl-CoA is the two-carbon starting material for cholesterol synthesis; it condenses to form acetoacetyl-CoA and then HMG-CoA.

• A. Chenodeoxy cholic acid
• B. Cholecystokinin
• C. Testosterone
• D. Glycocholic acid

Explanation: Chenodeoxycholic acid, glycocholic acid and testosterone are synthesized from cholesterol.

• A. Gluconeogenesis
• B. Glycolysis
• C. GlycogenolysisFind Chemistry Tutors
• D. Fatty acid synthesis

Explanation: Fatty-acid synthesis requires NADPH as the reducing power for converting carbon intermediates into a saturated fatty-acid chain.

• A. Acetyl CoA carboxylase
• B. Acyl transferase
• C. Aceto acetate synthetase
• D. Biotin

Explanation: Acetyl-CoA carboxylase is the rate-limiting and regulatory enzyme of fatty-acid synthesis, producing malonyl-CoA from acetyl-CoA.

• A. Cholesterol
• B. Prostaglandins
• C. Cell membrane lipid
• D. Saturated fatty acidConsult A Nutritionist

Explanation: Certain unsaturated fatty acids, especially arachidonic acid formed from linoleic acid, are precursors of prostaglandins through the…

• A. Acid
• B. Water
• C. Alkali
• D. Enzymes

Explanation: Saponification is alkaline hydrolysis of fats, producing glycerol and the salts of fatty acids known as soaps.

• A. Phospholipids
• B. Triglycerides
• C. Sphingomyelins
• D. Fatty acidsFind Chemistry Tutors

Explanation: Phospholipids form the basic bilayer of cell membranes because their hydrophilic heads face water while their hydrophobic tails face…

• A. It is a precursor of polyunsaturated fatty acids
• B. It is a component of cell membrane
• C. It stores up energy
• D. None of the above

Explanation: Cholesterol is an important structural component of cell membranes, where it helps regulate fluidity and permeability.

• A. Palmitic acid
• B. Oleic acid
• C. Linoleic acid
• D. Stearic acid

Explanation: Linoleic acid is an essential fatty acid because humans cannot introduce the required double bond and must obtain it from the diet.

• A. Electrolytes
• B. Irons
• C. Non electrical insulators
• D. Electrical insulators

Explanation: Nonpolar lipids lack charged groups and therefore resist the movement of electrical charge, making them effective electrical insulators.

• A. Rosiglitgazone
• B. Voglibose
• C. Exanatide
• D. Repaglinide

Explanation: Rosiglitazone activates PPAR-gamma, a nuclear receptor that regulates genes involved in insulin sensitivity and glucose and lipid…

• A. 200 mg/dl
• B. 180 mg/dl
• C. 150 mg/dl
• D. 120 mg/dl

Explanation: A desirable total cholesterol level is below 200 mg/dL. Higher values indicate increasing cardiovascular risk, although interpretation…

• A. Bile acids
• B. Steroid hormones
• C. Energy
• D. Vitamin D

Explanation: Cholesterol is the precursor of bile acids, steroid hormones and vitamin D.

• A. 4
• B. 7
• C. 9
• D. 5

Explanation: Fat yields about 9 kcal per gram, more than carbohydrates and proteins, which each provide about 4 kcal per gram.

• A. Glucose synthesis
• B. Glycogen synthesis
• C. Protein syntehsis
• D. Fatty acid synthesis

Explanation: Insulin promotes storage and synthesis by increasing fatty-acid, glycogen, and protein synthesis.

• A. Glucose 1,6 diphosphate dehydrogenase
• B. Glucose 1 phosphate dehydrogenase
• C. Glucose 6 phosphate dehydrogenase
• D. All of the above

Explanation: Glucose-6-phosphate dehydrogenase catalyses the first step of the pentose phosphate pathway and produces NADPH.

• A. ATP
• B. ADP
• C. Acetyl CoA
• D. NADPH

Explanation: The HMP shunt, or pentose phosphate pathway, produces NADPH for reductive biosynthesis and antioxidant protection, along with…

• A. Transketolase
• B. 6 phosphogluconate dehydrogenase
• C. G6 PD
• D. Transaldolase

Explanation: Transketolase transfers a two-carbon unit in the HMP shunt and requires thiamine pyrophosphate, the active coenzyme form of vitamin B1.

• A. Glycogenolysis and Gluconeogenesis
• B. Glycolysis and citric acid cycle
• C. Embden-Meyerhof Pathway and H.M.P shunt
• D. Glycogenolysis and Citric and cycleOrder DNA Kits

Explanation: The brain primarily obtains energy by oxidising glucose through glycolysis, followed by the citric acid cycle and oxidative…