Eukaryotic cells partition functions among a nucleus, endomembrane system, cytoskeleton, mitochondria, and other organelles, enabling regulated and spatially organized cellular activity.
Coverage 2013–2025 · Updated 15 Jul 2026
A eukaryotic cell has a plasma membrane enclosing compartmentalized cytoplasm with 80S ribosomes, a nucleus and membrane-bound organelles.
| Structure | Required feature or role |
|---|---|
| Nucleus | DNA-histone chromosomes inside a double membrane with pores |
| Mitochondrion | Aerobic respiration and ATP production |
| Rough / smooth ER | Protein synthesis and processing / lipid-related synthesis |
| Golgi apparatus | Modifies and sorts cell products |
| Vesicles, vacuoles, lysosomes | Transport, storage or intracellular digestion |
| Cytoskeleton | Microtubules and microfilaments organize shape and movement |
| 80S ribosomes | Protein synthesis in cytoplasm or on rough ER |
A secreted protein is synthesized on rough-ER ribosomes, processed through ER and Golgi, then carried in a vesicle to the plasma membrane.
Not every eukaryotic cell displays every organelle equally clearly; identify the cell using a combination of visible structures.
This objective is assessed through structured response, commonly using Identify / Label / State.
Identify / Label / State / Draw
Build the answer around this relationship: The nucleus encloses the chromosomes of a eukaryotic cell.
Identifying an organelle from size alone while ignoring membranes and internal structure.
Representative question
Label structures I, II, III and IV.
I.
II.
III.
IV.
The SL core is a practical chain. First, understand cells as structural and functional units. Then use microscopes correctly: prepare, stain, calibrate, measure, and choose a method based on resolution and the detail needed. Finally, identify cell types from visible evidence and draw only what the micrograph shows. This is how the topic turns from definitions into exam performance.
