The electron microscope has revealed that one of the components within the cell consists of pinwheel array of 9 triplets of microtubules arranged to form a hollow tube. This structure is a ________.

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The structure described is a centriole, which is composed of 9 triplets of microtubules arranged in a pinwheel pattern to form a hollow tube. The centrosome is a region near the nucleus that contains centrioles, while a chromosome is a condensed form of DNA. Ribosomes are not composed of microtubules and do not have a pinwheel array pattern.

The Electron Microscope Has Revealed That One of the Components