BIOL 251 FINAL EXAM AND STUDY
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COMPLETE 350 REAL EXAM QUESTIONS
AND CORRECT VERIFIED ANSWERS/
ALREADY GRADED A+ (MOST RECENT!!)
SECTION 1: CELLULAR BIOLOGY & CHEMISTRY (Q1–35)
Q1. What is the primary function of the plasma membrane?
A: Regulates the passage of substances into and out of the cell (selective permeability).
Q2. Which organelle is responsible for ATP production via aerobic respiration?
A: Mitochondria.
Q3. What is the function of the rough endoplasmic reticulum?
A: Protein synthesis and modification (due to attached ribosomes).
Q4. Which cellular structure contains digestive enzymes to break down waste and
cellular debris?
A: Lysosomes.
Q5. What is the term for the diffusion of water across a selectively permeable
membrane?
A: Osmosis.
Q6. A solution that has a higher solute concentration than the inside of a cell is called
what?
A: Hypertonic.
Q7. What happens to a red blood cell placed in a hypotonic solution?
A: It swells and undergoes hemolysis (bursts).
,Q8. What is the primary energy currency of the cell?
A: ATP (Adenosine Triphosphate).
Q9. Which process does NOT require ATP: Active Transport, Endocytosis, or Facilitated
Diffusion?
A: Facilitated Diffusion (passive transport).
Q10. The sodium-potassium pump moves which ions in which directions?
A: 3 Na+ out of the cell, 2 K+ into the cell (against their gradients).
Q11. What is the genetic material found in the nucleus?
A: DNA (Deoxyribonucleic acid).
Q12. What is the basic structural unit of DNA?
A: Nucleotide.
Q13. Which phase of the cell cycle does DNA replicate?
A: S phase (Synthesis).
Q14. What is the end product of mitosis?
A: Two genetically identical diploid daughter cells.
Q15. What is the term for programmed cell death?
A: Apoptosis.
Q16. What is the difference between a solute and a solvent?
A: Solute is dissolved; Solvent does the dissolving (e.g., water).
Q17. What is the pH range of blood?
A: 7.35 – 7.45 (slightly alkaline).
Q18. Which organelle is responsible for protein packaging and secretion?
A: Golgi apparatus.
,Q19. What is the function of a ribosome?
A: Translation of mRNA to synthesize proteins.
Q20. What is the name of the fluid inside the cell?
A: Intracellular fluid (ICF) or Cytosol.
Q21. Which type of transport uses vesicles to move large particles INTO the cell?
A: Endocytosis (specifically phagocytosis or pinocytosis).
Q22. Which type of transport uses vesicles to move large particles OUT of the cell?
A: Exocytosis.
Q23. What is the function of the nucleolus?
A: Produces ribosomal RNA (rRNA) and assembles ribosomes.
Q24. Which organelle is involved in detoxification and lipid synthesis?
A: Smooth Endoplasmic Reticulum.
Q25. What is a catalyst?
A: A substance (like an enzyme) that speeds up a chemical reaction without being
consumed.
Q26. What is the specific region on an enzyme where the substrate binds?
A: Active site.
Q27. What is the primary function of the cytoskeleton?
A: Maintains cell shape, anchors organelles, and facilitates cell movement.
Q28. Which type of intercellular junction allows for direct communication between
adjacent cells via ions?
A: Gap junctions.
Q29. Which type of junction prevents leakage between epithelial cells?
A: Tight junctions (Zonula Occludens).
, Q30. Which type of junction anchors cells together like rivets (desmosomes)?
A: Desmosomes.
Q31. What is the difference between anabolism and catabolism?
A: Anabolism builds larger molecules (requires energy); Catabolism breaks down larger
molecules (releases energy).
Q32. What is the primary role of glycolipids in the plasma membrane?
A: Cell recognition and adhesion.
Q33. What does the term "amphipathic" mean in relation to phospholipids?
A: It has both a hydrophilic (water-loving) head and a hydrophobic (water-fearing) tail.
Q34. Which molecule provides the immediate source of energy for cellular work?
A: ATP.
Q35. What is the final electron acceptor in the electron transport chain?
A: Oxygen.
SECTION 2: HISTOLOGY (TISSUES) (Q36–65)
Q36. What are the four primary types of tissue?
A: Epithelial, Connective, Muscle, and Nervous.
Q37. What is the main function of epithelial tissue?
A: Protection, secretion, absorption, and filtration.
Q38. What is the name of the basal layer that attaches epithelial tissue to underlying
connective tissue?
A: Basement membrane.
GUIDE NEWEST 2026 TEST BANK|
COMPLETE 350 REAL EXAM QUESTIONS
AND CORRECT VERIFIED ANSWERS/
ALREADY GRADED A+ (MOST RECENT!!)
SECTION 1: CELLULAR BIOLOGY & CHEMISTRY (Q1–35)
Q1. What is the primary function of the plasma membrane?
A: Regulates the passage of substances into and out of the cell (selective permeability).
Q2. Which organelle is responsible for ATP production via aerobic respiration?
A: Mitochondria.
Q3. What is the function of the rough endoplasmic reticulum?
A: Protein synthesis and modification (due to attached ribosomes).
Q4. Which cellular structure contains digestive enzymes to break down waste and
cellular debris?
A: Lysosomes.
Q5. What is the term for the diffusion of water across a selectively permeable
membrane?
A: Osmosis.
Q6. A solution that has a higher solute concentration than the inside of a cell is called
what?
A: Hypertonic.
Q7. What happens to a red blood cell placed in a hypotonic solution?
A: It swells and undergoes hemolysis (bursts).
,Q8. What is the primary energy currency of the cell?
A: ATP (Adenosine Triphosphate).
Q9. Which process does NOT require ATP: Active Transport, Endocytosis, or Facilitated
Diffusion?
A: Facilitated Diffusion (passive transport).
Q10. The sodium-potassium pump moves which ions in which directions?
A: 3 Na+ out of the cell, 2 K+ into the cell (against their gradients).
Q11. What is the genetic material found in the nucleus?
A: DNA (Deoxyribonucleic acid).
Q12. What is the basic structural unit of DNA?
A: Nucleotide.
Q13. Which phase of the cell cycle does DNA replicate?
A: S phase (Synthesis).
Q14. What is the end product of mitosis?
A: Two genetically identical diploid daughter cells.
Q15. What is the term for programmed cell death?
A: Apoptosis.
Q16. What is the difference between a solute and a solvent?
A: Solute is dissolved; Solvent does the dissolving (e.g., water).
Q17. What is the pH range of blood?
A: 7.35 – 7.45 (slightly alkaline).
Q18. Which organelle is responsible for protein packaging and secretion?
A: Golgi apparatus.
,Q19. What is the function of a ribosome?
A: Translation of mRNA to synthesize proteins.
Q20. What is the name of the fluid inside the cell?
A: Intracellular fluid (ICF) or Cytosol.
Q21. Which type of transport uses vesicles to move large particles INTO the cell?
A: Endocytosis (specifically phagocytosis or pinocytosis).
Q22. Which type of transport uses vesicles to move large particles OUT of the cell?
A: Exocytosis.
Q23. What is the function of the nucleolus?
A: Produces ribosomal RNA (rRNA) and assembles ribosomes.
Q24. Which organelle is involved in detoxification and lipid synthesis?
A: Smooth Endoplasmic Reticulum.
Q25. What is a catalyst?
A: A substance (like an enzyme) that speeds up a chemical reaction without being
consumed.
Q26. What is the specific region on an enzyme where the substrate binds?
A: Active site.
Q27. What is the primary function of the cytoskeleton?
A: Maintains cell shape, anchors organelles, and facilitates cell movement.
Q28. Which type of intercellular junction allows for direct communication between
adjacent cells via ions?
A: Gap junctions.
Q29. Which type of junction prevents leakage between epithelial cells?
A: Tight junctions (Zonula Occludens).
, Q30. Which type of junction anchors cells together like rivets (desmosomes)?
A: Desmosomes.
Q31. What is the difference between anabolism and catabolism?
A: Anabolism builds larger molecules (requires energy); Catabolism breaks down larger
molecules (releases energy).
Q32. What is the primary role of glycolipids in the plasma membrane?
A: Cell recognition and adhesion.
Q33. What does the term "amphipathic" mean in relation to phospholipids?
A: It has both a hydrophilic (water-loving) head and a hydrophobic (water-fearing) tail.
Q34. Which molecule provides the immediate source of energy for cellular work?
A: ATP.
Q35. What is the final electron acceptor in the electron transport chain?
A: Oxygen.
SECTION 2: HISTOLOGY (TISSUES) (Q36–65)
Q36. What are the four primary types of tissue?
A: Epithelial, Connective, Muscle, and Nervous.
Q37. What is the main function of epithelial tissue?
A: Protection, secretion, absorption, and filtration.
Q38. What is the name of the basal layer that attaches epithelial tissue to underlying
connective tissue?
A: Basement membrane.
