Biochemistry (PACOP Green)
Questions and Answers | Latest
Version | 2025/2026 | Correct & Verified
Which biomolecule is the primary source of energy in cells?
A. Proteins
B. Nucleic acids
✔✔C. Carbohydrates
D. Lipids
What is the main function of enzymes in biochemical reactions?
A. Provide energy
✔✔B. Catalyze reactions and lower activation energy
C. Store genetic information
D. Serve as structural components
Which vitamin is water-soluble and essential for collagen synthesis?
A. Vitamin A
B. Vitamin D
1
,✔✔C. Vitamin C
D. Vitamin E
What type of bond links amino acids in proteins?
A. Hydrogen bond
✔✔B. Peptide bond
C. Ionic bond
D. Glycosidic bond
Which process converts glucose into pyruvate in the cytoplasm?
A. Krebs cycle
✔✔B. Glycolysis
C. Beta-oxidation
D. Gluconeogenesis
Which coenzyme is derived from vitamin B3?
A. FAD
B. CoA
2
,✔✔C. NAD+
D. TPP
What is the primary storage form of glucose in animals?
A. Cellulose
✔✔B. Glycogen
C. Starch
D. Chitin
Which molecule is the end product of anaerobic glycolysis in muscles?
A. Acetyl-CoA
✔✔B. Lactate
C. Pyruvate
D. Oxaloacetate
Which amino acid is essential and cannot be synthesized by humans?
A. Glutamine
✔✔B. Lysine
3
, C. Tyrosine
D. Alanine
Which lipid type is a major component of biological membranes?
A. Triglycerides
B. Cholesterol esters
✔✔C. Phospholipids
D. Free fatty acids
Which organelle is the main site of oxidative phosphorylation?
A. Golgi apparatus
B. Endoplasmic reticulum
✔✔C. Mitochondria
D. Nucleus
Which process generates glucose from non-carbohydrate precursors?
A. Glycolysis
B. Glycogenolysis
4
Questions and Answers | Latest
Version | 2025/2026 | Correct & Verified
Which biomolecule is the primary source of energy in cells?
A. Proteins
B. Nucleic acids
✔✔C. Carbohydrates
D. Lipids
What is the main function of enzymes in biochemical reactions?
A. Provide energy
✔✔B. Catalyze reactions and lower activation energy
C. Store genetic information
D. Serve as structural components
Which vitamin is water-soluble and essential for collagen synthesis?
A. Vitamin A
B. Vitamin D
1
,✔✔C. Vitamin C
D. Vitamin E
What type of bond links amino acids in proteins?
A. Hydrogen bond
✔✔B. Peptide bond
C. Ionic bond
D. Glycosidic bond
Which process converts glucose into pyruvate in the cytoplasm?
A. Krebs cycle
✔✔B. Glycolysis
C. Beta-oxidation
D. Gluconeogenesis
Which coenzyme is derived from vitamin B3?
A. FAD
B. CoA
2
,✔✔C. NAD+
D. TPP
What is the primary storage form of glucose in animals?
A. Cellulose
✔✔B. Glycogen
C. Starch
D. Chitin
Which molecule is the end product of anaerobic glycolysis in muscles?
A. Acetyl-CoA
✔✔B. Lactate
C. Pyruvate
D. Oxaloacetate
Which amino acid is essential and cannot be synthesized by humans?
A. Glutamine
✔✔B. Lysine
3
, C. Tyrosine
D. Alanine
Which lipid type is a major component of biological membranes?
A. Triglycerides
B. Cholesterol esters
✔✔C. Phospholipids
D. Free fatty acids
Which organelle is the main site of oxidative phosphorylation?
A. Golgi apparatus
B. Endoplasmic reticulum
✔✔C. Mitochondria
D. Nucleus
Which process generates glucose from non-carbohydrate precursors?
A. Glycolysis
B. Glycogenolysis
4
