Q.38 Match the organelles in Group I with their functions in Group II.
Group I Group II
P. Lysosome 1. Digestion of foreign substances
Q. Smooth ER 2. Protein targeting
R. Golgi apparatus 3. Lipid synthesis
S. Nucleolus 4. Protein synthesis
5. rRNA synthesis
(A) P–1, Q–3, R–2, S–5 (B) P–1, Q–4, R–5, S–3
(C) P–2, Q–5, R–3, S–4 (D) P–1, Q–3, R–4, S–5
Correct Answer: (A) P-1, Q-3, R-2, S-5
Lysosomes digest foreign substances like bacteria and worn-out organelles using hydrolytic enzymes. Smooth ER handles lipid synthesis, including steroids and phospholipids. Golgi apparatus manages protein targeting and modification for secretion or other destinations, while the nucleolus specializes in rRNA synthesis for ribosome assembly.
Organelle Matching Breakdown
Lysosome (P) matches Digestion of foreign substances (1).
These organelles act as the cell’s digestive system, breaking down pathogens, extracellular debris, and damaged components via acid hydrolases in an acidic lumen.
Smooth ER (Q) matches Lipid synthesis (3).
Lacking ribosomes, it features enzymes for phospholipid, steroid, and detoxification processes, prominent in cells like hepatocytes and steroid-producing glands.
Golgi Apparatus (R) matches Protein targeting (2).
It modifies proteins from the rough ER through glycosylation, sorting them into vesicles for lysosomes, plasma membrane, or secretion.
Nucleolus (S) matches rRNA synthesis (5).
This nuclear substructure transcribes ribosomal RNA and assembles ribosomal subunits, excluding protein synthesis (4), which occurs at ribosomes.
Option Analysis
| Option | P-Lysosome | Q-Smooth ER | R-Golgi | S-Nucleolus | Correct? |
|---|---|---|---|---|---|
| (A) | 1 (✓) | 3 (✓) | 2 (✓) | 5 (✓) | Yes |
| (B) | 1 (✓) | 4 (✗ Protein synthesis = ribosomes) | 5 (✗ rRNA = nucleolus) | 3 (✗ Lipids = smooth ER) | No |
| (C) | 2 (✗ Protein targeting = Golgi) | 5 (✗ rRNA = nucleolus) | 3 (✗ Lipids = smooth ER) | 4 (✗ Protein synthesis = ribosomes) | No |
| (D) | 1 (✓) | 3 (✓) | 4 (✗ Protein synthesis = ribosomes) | 5 (✓) | No |
Option (A) alone correctly pairs all organelles with their primary functions.
Introduction to Organelles Functions Matching
Organelles functions matching questions test core cell biology knowledge, linking structures like lysosome, smooth ER, Golgi apparatus, and nucleolus to roles such as digestion of foreign substances, lipid synthesis, protein targeting, and rRNA synthesis. These MCQs appear frequently in exams like NEET, CSIR NET, and GATE Life Sciences, emphasizing precise pairings for competitive success.
Key Functions of Matched Organelles
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Lysosome: Primary site for digestion of foreign substances via phagocytosis or autophagy, containing 50+ hydrolytic enzymes active at pH 5.
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Smooth Endoplasmic Reticulum: Dedicated to lipid synthesis, including cholesterol and phospholipids, plus glycogen metabolism and drug detoxification.
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Golgi Apparatus: Central hub for protein targeting, performing O- and N-linked glycosylation to direct proteins to lysosomes, secretion, or membranes.
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Nucleolus: Exclusive for rRNA synthesis (transcribed by RNA Pol I) and early ribosome biogenesis steps.
Distinguish from distractors: Ribosomes handle protein synthesis (option 4), not Golgi or smooth ER.
Exam Strategies for Organelles Matching
Visualize pathways: Lysosome recycles via endocytosis; smooth ER feeds Golgi lipids; Golgi sorts ER proteins; nucleolus supplies ribosomes cell-wide. Practice with 20-30 similar MCQs weekly to score 95%+ in cell biology sections.
Common Pitfalls in MCQs
Trick options swap lipid synthesis (smooth ER) with rRNA (nucleolus) or assign protein synthesis to Golgi. Recall: No ribosomes on smooth ER excludes translation; Golgi modifies, doesn’t synthesize proteins de novo.
