Question

Identify A, B, C, D, E and F in the given diagrammatic representation of the internal structure of cilia/flagella.

Answer 1

• The centrosome is an organelle usually containing two cylindrical structures called Centrioles. They are surrounded by amorphous pericentriolar materials. Both the centrioles in a centrosome lie perpendicular to each other in which each has an organization like the cartwheel.
• They are made up of nine evenly spaced peripheral fibrils of tubulin. Each of the peripheral fibrils is a triplet. The adjacent triplets are also linked. The central part of the centriole is also proteinaceous and called the hub, which is connected with tubules of the peripheral triplets by radial spokes made of protein.
• The centrioles create the basal body of cilia or flagella, and spindle fibers that give rise to the spindle apparatus during cell division in animal cells.