Question

Choose the correct answers from the alternatives given :
The centromere or primary constriction of the chromosome contains rings of protein that are intimately associated with a spindle fibre. These rings are called

• A. asters
• B. secondary constrictions
• C. centrioles
• D. kinetochores

Answer 1

The correct option is D kinetochores

• The kinetochore is the region which is present in the center of the chromosome near the centromere or the primary constriction.
• The spindle fibers which are formed from the centrioles are required to pulled the chromosome towards the poles of the dividing daughter cells.
• The spindle fiber of the centrioles are attached to the kinetochore which is a protein ring or made up of protein which forms bonds with tubulin protein of the spindle fiber, so that the chromosomes can be pulled apart towards the poles.
• Therefore the answer option 'kinetochores' is correct.