35. Corn ( Zea maize) contains 20 chromosomes is its somatic cell. How many chromatids would this 
cell contain in its metaphase stage? 

                        a) 2       b) 10       c) 20        d) 40 
 
Press here to check answer.  press 
 
 
 
 
 

Read the pages indicated by G-7 and study behavioral objective 14 and 15. After the completion of nuclear division (mitosis) the cytoplasm will divide into almost equal halves in a manner that each half will contain one of the nuclei. This event is called cytokinesis. Because plant cells have a thick cell wall cytokinesis occurs differently in plant cells than animal cells. In your notes write a description 
contrasting between cytokinesis in plant cells and animal cells. Include the following terms: cell plate, 
ring of microfilaments, pinching. 
 
 

                                 k 
 
Note how a cell wall forms between the two newly synthesized nuclei in the plant cell above. The cell wall forms along a cell plate which is formed by microtubules. The above figure shows the formation of a cell plate after the two nuclei have reformed during late telophase in a plant cell. 
 

                             k 

 Note how the cell membrane simply pinches the cytoplasm into two parts with a newly synthesized nucleus in each cell. 
 

To move to the next page you must answer the following question correctly. 
 

Why can't the plant cell's cytoplasm  simply pinch into two parts? 

 a ) The stiff cell wall prevents it from being pinched into two parts. 
 b ) Plant cells do not have Golgi to form elastin used for stretching the cell membrane. 
For information on how to use this page, go to How to Use This Site.