arrangement of microtubules that compose the centrioles

Under the electron microscope the centrioles appear as two short, hollow, cylinders usually lying at right angles to each other. Each centriole is made up of nine microtubule triplets, which lie evenly spaced in a ring. There are no microtubules in the center..

. They show a (9+o) arrangement of microtubules. They are involved in the formation of spindle fibres during cell division and the basal bodies of cilia and flagella. Cilia and flagella are found in the surface of motile cells. They show a (9+2) arrangement of mic..

. The axoneme is composed of eleven microtubules (9+2 arrangement). The movement of cilia and flagella is brought about by sliding of the nine double microtubules past each other, using energy from A..

After the centrioles reach their positions corresponding to the two opposite poles, the chromosomes arrange themselves upon the equator of a spindle, which is formed in the cell by delicate cytoplasmic threads radiating from the centrioles. Each sister chromatid is at..

Pith is the innermost region of the root representing the central axis. It is composed of few loosely arranged parenchyma cell..

These are very fine thread-like, coiled filaments uniformly distributed in the nucleoplasm. At the time of cell division, the chromatin becomes thick and ribbon like and are known as chromosomes. The chromosomes contain genes, which are composed of DNA (deoxy-ribonucleic acid). Genes are..

At the molecular level all the different types of cells in living organisms are composed of certain chemical substances. The structure and function of the cell and its components are dependent on the molecular structure, arrangement and properties of these chemical constit..

Muscle is composed of a large number of muscle fibres. The muscle fibres are arranged in groups. Each group is under the control of a single motor neuron, the axon of which sends a terminal branch to each fibre of the group. All the muscle fibres of a group contract when a..

Meristematic tissues are composed of cells that divide continuously. The cells are spherical, oval, polygonal or rectangular The cell wall is thin and made up of cellulose The cells are closely arranged without inter-cellular spaces Cytoplasm is abundant and nuclei are large Vac..

Introduction - At the molecular level all the different types of cells in living organisms are composed of certain chemical substances. The structure and function of the cell and its components are dependent on the molecular structure, arrangement and properties of these chemica..