Systems Exam Questions and Verified Answers 2026
1. Which organelle is known as the “powerhouse of the cell”?
A. Nucleus
B. Ribosome
C. Golgi apparatus
D. Mitochondrion
Answer: D
2. Which macromolecule is primarily responsible for storing genetic information?
A. Protein
B. Lipid
C. Carbohydrate
D. Nucleic acid
Answer: D
3. What is the monomer of proteins?
A. Fatty acids
B. Monosaccharides
C. Nucleotides
D. Amino acids
Answer: D
4. Which molecule is the main energy source for cells?
A. DNA
B. Protein
C. Glucose
D. Cholesterol
Answer: C
5. During cellular respiration, most ATP is produced in the:
A. Cytoplasm
B. Ribosome
C. Mitochondria
D. Lysosome
Answer: C
, 6. Which process converts glucose into pyruvate?
A. Krebs cycle
B. Electron transport chain
C. Glycolysis
D. Fermentation
Answer: C
7. Which enzyme unwinds DNA during replication?
A. Ligase
B. Polymerase
C. Primase
D. Helicase
Answer: D
8. Which type of bond holds amino acids together in proteins?
A. Hydrogen bond
B. Ionic bond
C. Peptide bond
D. Glycosidic bond
Answer: C
9. Which blood vessel carries oxygenated blood from the lungs to the heart?
A. Pulmonary artery
B. Aorta
C. Vena cava
D. Pulmonary vein
Answer: D
10. What is the main function of enzymes?
A. Store genetic information
B. Produce hormones
C. Speed up chemical reactions
D. Carry oxygen
Answer: C
11. Which hormone lowers blood glucose levels?
A. Glucagon
B. Cortisol
C. Epinephrine
D. Insulin