Discussion
Match the correct combination between A and B :
| (A) | (B) |
|---|---|
| (1) Prokaryotic cells | (i) more than 10 micrometers and lack membrane surrounding every organells |
| (2) Eukaryotic cells | (ii) more than 10 micrometers and lack membrane around some organelles |
| (3) Eukaryotic cells | (iii) less than 10 micrometers and possess membrane around some organelles |
| (4) Prokaryotic cells | (iv) less than 5 micrometers and lack membrane around all organells |
Answer: D
The correct combination is 4 and (iv): prokaryotic cells are less than 5 micrometres across and have no membrane around any organelle.
Typical bacteria are 0.5 to 5 micrometres long, and they lack a nucleus and membrane-bound organelles such as mitochondria, chloroplasts, the endoplasmic reticulum and the Golgi apparatus; their ribosomes are not membrane-bound.
The other pairs are wrong. Prokaryotic cells are not more than 10 micrometres (pair 1 and ii). Eukaryotic cells, usually 10 to 100 micrometres, do not lack membranes around their organelles (pair 2 and i). Pair 3 and iii is wrong on both counts: eukaryotic cells are usually larger than 10 micrometres, and they have membranes around nearly all their organelles, not just some.
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