Structur1 - to play a clear role in organization of the...

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Structure: The fundamental structure of both cilia and flagella is the axoneme . The axoneme is composed of microtubules and associated proteins. Microtubules are in a characteristic 9 + 2 arrangement with a central pair of microtubules surrounded by 9 outer doublet microtubules. Outer doublets are connected to central pair of microtubules by radial spokes. Two arms of dynein are attached to each A tubule and the motor activity of these dyneins drives the beating of cilia and flagella. The minus ends of the microtubules are anchored in a basal body which is similar in structure to centriole. It contains 9 triplet microtubules and is known
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Unformatted text preview: to play a clear role in organization of the axoneme microtubules. Each of the outer microtubule doublets of an axoneme is formed by extension of the two microtubules present in triplet in the basal body. Thus, the basal body serves to initiate the growth of axonemal microtubules as well as anchoring cilia and flagella to the surface of the cell. • Movements of cilia and flagella result from the sliding of the outer microtubule doublets relative to each other, powered by motor activity of dynein. It is not known how dynein action is coordinated...
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This document was uploaded on 11/03/2011 for the course BIOLOGY MCB2010 at Broward College.

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