Sunday, 24 July 2016

CENTRIOLE & CENTROSOME (23 Qs)



One of the most important features of living organisms is growth and reproduction. Both these phenomena are due to cell division. In cell division distribution of chromosomes is the most important aspect. Here centrioles play an important role by forming spindle fibres.

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QUESTIONS & ANSWERS


1) What is the spherical body that controls the arrangement of centrioles in a cell?
A) Centrosphere
2) How is the thick fluid substance in Centrosome called?
A) Kinoplasm
3) How is a pair of centrioles in a centrosome called?
A) Diplosome
4) How are two centrioles arranged in a centrosome ?
A) Perpendicular arrangement
5) Who gave the ultrastructure of centrioles?
A) Benden & Boveri
6) What is the shape of a Centriole?
A) Cartwheel structure
7) What kind of arrangement of fibrils is seen in a centriole?
A) 9+0 arrangement
8) How are groups of CBA fibrils in a centriole described?
A) Triplet fibrils
9) What are the building blocks of centrioles?
A) Tubulins
10) How much angle is maintained by triplets of fibrils with respect to each other?
A) 40 degree angle
11) What is meant by PCM?
A) Peri Centriolar Matrix
12) How many protofilaments are there per a microtubule?
A) 13 fibrils
13) What are the connecting links between adjacent triplets?
A) C-A linkers
14) In which phase of cell cycle centrioles are duplicated?
A) G2 phase
15) What are the A to hub links?
A) Massules or Peri Centriolar Satellites
16) Which enzyme provides energy to locomotory organelles & spingle fibre movement?
A) ATPase
17) What is the origin of spindle fibres during cell division?
A) Asters
18) Name the eukaryotic organisms without centrioles.
A) Funi, Pinophytes & Angiosperms
19) Which cellular organelle guides the location of a nucleus?
A) Centriole
20) Which enzyme is responsible for the duplication and separation of centrioles?
A) Separase
21) Name the genes responsible for the formation of centrioles.
A) Centrins
22) How many triplets are there per a centriole?
A) 9 triplets
23) What is the mother centriole for cilia and flagella?
A) Blepharoplast, Basal body or Kinetosome
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