Match Organelles to Their Work
Organelles are easier to remember when each structure is tied to its dominant job, location and cell type.
Living-system questions are solved by matching a structure or organism to its function, process and stated condition.
Read a cell from its boundary to its working parts
Structure → location → job
First locate the boundary, then the control or energy structure, then the organelle named in the question. Match its structure to its job.
Match ER type to cell function
Smooth ER supports lipid/steroid synthesis and detoxification; rough ER supports synthesis of secreted and membrane proteins. Gonadal and adipose cells use abundant SER, while pancreatic enzyme-secreting cells are rich in RER.
Track specialised organelles
Spliceosomes process pre-mRNA in the nucleus. Chloroplast proteins may be encoded in either the nuclear or chloroplast genome; chloroplast genes generally show cytoplasmic rather than Mendelian inheritance. Yeast peroxisomes are repressed by glucose and induced by methanol; they grow using proteins and lipids supplied from the ER and need not arise only by fission.
Retained chloroplasts in sea slugs
Some sacoglossan sea slugs retain functional chloroplasts taken from algal food (kleptoplasty). In electron micrographs, chloroplasts show internal thylakoid membranes; do not confuse them with mitochondria or food vacuoles.
OlympIQ exam lens
- ✓SER: lipids/steroids and detoxification; RER: protein secretion.
- ✓Spliceosome: nucleus.
- ✓Chloroplast genes: cytoplasmic inheritance.
- ✓Yeast peroxisomes: glucose-repressed, methanol-induced.
Match an organelle to the cell’s main activity, not to a single possible function.
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