CB-01 — Ultimate Last-Day Cheat Sheet
MUST KNOW — High-Frequency NEET Facts
| FACT | VALUE |
|---|---|
| Prokaryotic ribosome | 70S (50S + 30S) |
| Eukaryotic cytoplasmic ribosome | 80S (60S + 40S) |
| Mitochondria/Chloroplast ribosome | 70S (prokaryotic type) |
| Fluid Mosaic Model proposers | Singer & Nicolson (1972) |
| "Suicide bags" of cell | Lysosomes |
| Semi-autonomous organelles | Mitochondria + Chloroplasts |
| Middle lamella composition | Calcium pectate |
| Bacterial cell wall composition | Peptidoglycan (murein) |
| Fungal cell wall composition | Chitin |
| Plant cell wall composition | Cellulose |
| Prokaryotic flagella protein | Flagellin |
| Eukaryotic flagella arrangement | 9+2 tubulin |
| rRNA synthesis site | Nucleolus |
| Cell Theory (year) | 1838–39 (Schleiden + Schwann) |
| "Omnis cellula e cellula" | Virchow |
| Cis face of Golgi | Receives from ER |
| Trans face of Golgi | Releases vesicles for secretion |
| Endosymbiotic Theory | Lynn Margulis (1967) |
| Plant cytokinesis method | Cell plate (centrifugal) |
| Animal cytokinesis method | Cleavage furrow (centripetal) |
| Cristae (location + function) | Inner mitochondrial membrane → ATP synthesis surface |
| Grana (location + function) | Thylakoid stacks in chloroplast → light reactions |
PRESENT IN ONLY ONE CELL TYPE
| Structure | Present In | Absent In |
|---|---|---|
| Centrioles | Animal cells | Most plant cells |
| Lysosomes | Animal cells | Plant cells (mostly) |
| Plastids (chloroplasts etc.) | Plant cells | Animal cells |
| Cell wall (cellulose) | Plant cells | Animal cells |
| Large central vacuole | Plant cells | Animal cells |
| Plasmodesmata | Plant cells | Animal cells |
| Tight/Gap junctions | Animal cells | Plant cells |
| Peptidoglycan wall | Bacteria | Eukaryotes |
| Mesosomes | Prokaryotes | Eukaryotes |
| Plasmids | Prokaryotes (mostly) | Eukaryotes (rare) |
KEY TRAPS TO AVOID
- Mito ribosomes = 70S (NOT 80S — location in eukaryote is irrelevant)
- Middle lamella = Calcium pectate (NOT cellulose)
- Lysosomes from Golgi (NOT from ER)
- Mito + Chloroplasts NOT in endomembrane system (semi-autonomous)
- Svedberg units NOT additive (50+30 = 70S; 60+40 = 80S by convention)
- Prokaryote flagella = flagellin (NOT tubulin; NO 9+2)
- Cell plate formation = Golgi (NOT ER, NOT mitochondria)