Question

Do plant cells have centrioles?

Answer 1

Hint: Centrioles are the organelles that are cylindrical in shape and consist of proteins known as tubulin and are found in the eukaryotic cells mostly. The conifers and other angiosperms plants lack centrioles.

Complete answer:
Centrioles are present in some lower plants and are absent in higher plants. The cells do not use centrioles for cell division in these plants. Lower plants are composed of flagella which possess the centrioles at the base of flagella and support cell division with the movement of the cell. Centrioles are composed of 9 sets of short microtubule triplets which are arranged in a cylinder and include additional proteins like centrin, testing and calnexin. Centrioles produce cilia during the interphase and aster and spindle during their cell division which is considered as the main function of centrioles. The organisation of the mitotic spindle and the completion of cytokinesis takes place with the help of centrioles and the centrioles help in the formation of the mitotic spindle in animal cells.
The cell consists of two centrioles before the replication of DNA and is known as the mother centriole and younger daughter centriole. The new centriole grows at the proximal end of the mother and daughter centrioles during the cell division and the two centriole pairs get attached after duplication until mitosis. The distal end of the mother centriole consists of radiating appendages and is attached to the daughter centrioles with the proximal end.

Note:
Spirochetes are bacteria with microtubules from where the centrioles are derived. These microtubules act as part of the cytoskeleton. Centrioles are the source of the formation of spindle fibres which separate the chromosome during the process of cell division and focuses on ciliogenesis.