Describe the structure and function of cilia and flagella. Be sure to include the following in your answer : basal body, doublets, triplets, dynein, fused, unfused, and "9+2."
What will be an ideal response?
Flagella and cilia are motile extensions of a cell, and they contain nine fused pairs of microtubules (each pair is a doublet) arranged in a ring around two single unfused microtubules, yielding a "9+2" arrangement. Dynein motor molecules walk along adjacent microtubule doublets, causing the doublets to slide past each other; this is responsible for the bending and stroking actions of cilia and flagella. Cilia and flagella arise from basal bodies, which are similar to centrioles and have nine fused triplets rather than doublets of microtubules and do not surround any unfused microtubules.
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What will be an ideal response?
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a) A b) B c) C d) F e) H