Study behavioral objective 16. Describe the microtubule arrangement of the centriole pair and place in your notes. You may want to go back to miniunit Beta and review the function of the centriole pair. 
 
 

              c

                        centriole pair  

Centrioles are found only in animal cells and some Protists. They are not found in the higher plant cells. 

In animal cells they act as spindle organizing centers at the poles during mitosis. Centrioles also  synthesize the microtubules of cilia and flagella. During mitosis each pair of centrioles separate and move to opposite poles in animal cells. After mitosis during interphase the parent centriole pair will synthesize  a second pair.  Plant cells carry out cell division in a similar fashion. However, they do not have these centrioles to organize the spindles. The spindles simply organize at each pole opposite of one another. 
 

36. What is the microtubular arrangement of the centriole? 

       a) 9(3) + 2                               c)  9(1) + 2 
       b) 9(3) + 0                               d)  9(3) + 1 

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37. What is the chemical makeup of the centrioles? 

       a) lipid, microfilaments                      c) phospholipid, membranes 
       b) protein, spheres                            d) protein microtubules 

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This is the end of the lesson on mitosis. Click here to go on to lesson four Binary Fission. 
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