centrioles

The Centrosome and the Centrioles ANIMAL CELL CENTROSOME: The centrosome, also called the "microtubule organizing center", is an area in the cell where microtubles are produced.

. Within an animal cell centrosome there is a pair of small organelles, the centrioles, each made up of a ring of nine groups of microtubules. There are three fused microtubules in each group. The two centrioles are arranged such that one is perpendicular to the other.

During animal cell division, the centrosome divides and the centrioles replicate (make new copies). The result is two centrosomes, each with its own pair of centrioles.

The two centrosomes move to opposite ends of the nucleus, and from each centrosome, microtubules grow into a "spindle" which is responsible for separating replicated chromosomes into the two daughter cells.

PLANT CELL CENTROSOME: Plant cells have centrosomes that function much like animal cell centrosomes. However, unlike centrosomes in animal cells, they do not have centrioles.

Centrioles are cylindrical structures that are composed of groupings of microtubules arranged in a pattern. The pattern is so named because a ring of nine microtubule "triplets" are arranged at right angles to one another.

Microtubules are one of the components of the cytoskeleton. They have a diameter of 25 nm and length varying from 200 nanometers to 25 micrometers. Microtubules serve as structural components within cells and are involved in many cellular processes including mitosis, cytokinesis, and vesicular transport.cytoskeletonnm mitosiscytokinesisvesicular transport

Centrioles are found in animal cells and play a role in cell division. Centrioles replicate in interphase stage of mitosis and they help to organize the assembly of microtubules during cell division. Centrioles called "basal bodies" form cilia and flagella.

There are three fused microtubules in each group. The two centrioles are arranged such that one is perpendicular to the other.

Centrioles and Basal Bodies Centrioles and Basal Bodies Basically these are the same thing. A centriole is made up of nine (9) sets of triplet microtubules. A centriole is commonly found in the centrosome. A important note is that plant cells commonly do not have centrioles and they are not required for division. A triplet contains one complete microtubule fused to two incomplete microtubules. The centriole is a short cylinder-like structure.

The centriole is important in the formation of cilia or flagella, then it is called a basal body are typically thought in relation to cilium or flagellum, where as, centrioles are associated with the cytoskeleton. Centrioles are surrounded by a densely staining material pericentriolar material, this is where most of the microtubules arise from, also in cells without centrioles, the microtubules are organized from this densely stained material.

Centrioles as mentioned earlier are often known for their role in cell division. Centrioles seem to determine the position of the pericentriolar material, which in turn affects the polarity of the cell.