Q8 of 43 Page 52

Both unicellular and multicellular organisms undergo mitosis. What are the differences, if any, observed in the process between the two?

• In prokaryotes amitosis takes place, the cell directly divides into two daughter cells.


• Whereas in multicellular organisms, proper steps of cell division occurs; first the karyokinesis takes place then cytokinesis occurs.


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6

The following events occur during the various phases of the cell cycle, Name the phase against each of the events.

a. Disintegration of nuclear membrane _________________________


b. Appearance of nucleolus _________________________


c. Division of centromere _________________________


d. Replication of DNA _________________________


 7

Mitosis results in producing two cells which are similar to each other. What would be the consequence if each of the following irregularities occur during mitosis?

a. Nuclear membrane fails to disintegrate


b. Duplication of DNA does not occur


c. Centromeres do not divide


d. Cytokinesis does not occur


 9

Name the pathological condition when uncontrolled cell division occurs.

 10

Two key events take place, during S phase in animal cells, DNA replication and duplication of centriole. In which parts of the cell do events occur?