The following are the differences between prokaryotic and eukaryotic cells.
Prokaryotic Cell | Eukaryotic Cell |
1. Size: Generally small (1-10 \( \mu\)m); 1 \( \mu\)m \( =10^{-6}m\) | 1. Size: Generally large (5-100 \( \mu\)m) |
2. The nuclear region is not well defined as the nuclear membrane is absent and is referred to as the nucleoid. | 2. Nuclear region: well defined and girdled by a nuclear membrane. |
3. There is a single chromosome | 3. There are more than one chromosomes. |
4. Membrane-bound cell organelles absent. | 4. Membrane-bound cell organelles present. |
Which type of cell division is required for growth and repair of body and which type is involved in formation of gametes?
Carry out the following osmosis experiment:
Take four peeled potato halves and scoop each one out to make potato cups. One of these potato cups should be made from a boiled potato. Put each potato cup in a trough containing water. Now,
(a) Keep cup A empty
(b) Put one teaspoon sugar in cup B
(c) Put one teaspoon salt in cup C
(d) Put one teaspoon sugar in the boiled potato cup D.
Keep these for two hours. Then observe the four potato cups and answer the following:
(i) Explain why water gathers in the hollowed portion of B and C.
(ii) Why is potato A necessary for this experiment?
(iii) Explain why water does not gather in the hollowed out portions of A and D.
Where do the lipids and proteins constituting the cell membrane get synthesised?