Question

describe the structure of the following:
1) axoneme
2)centrosome

Answer 1

a) The structure of a typical centrioleconsists of a ring of nine microtubule triplets with two triplets in the middle (often referred to as the 9 + 2 structure). This structure is conserved in the vast majority of taxa that possess centrioles, with only minor variations.

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Answer 2

consists of a cylinder (axoneme) made up of a pair of central microtubules surrounded and joined by cross-bridges to a circle of nine pairs of microtubules. This “nine-plus-two” arrangement of the microtubules in the axoneme is surrounded by cytoplasm and ensheathed in cell membrane.

At the end of mitosis each daughter cell inherits a single centrosome and by the start of the next mitosis each contains just two centrosomes that will establish the bipolar spindle. ... This is based in the cycle of centriole splitting and centriole duplication (Sluder and Rieder, 1985).