Spindle microtubules that never attach to a chromosome are called:
APolar microtubules
BAstral microtubules
CKinetochore fibres
DContractile fibres
Answer & Solution
Correct answer: A. Polar microtubules
1. The spindle contains several classes of microtubule with different jobs.
2. Some grip chromosomes at the kinetochore and some do not.
3. Spindle microtubules that do not engage the chromosomes are called polar microtubules.
4. They push against each other to elongate the cell instead.
_Source: OpenStax Biology for AP(R) Courses (CC BY 4.0), Ch 10 'Cell Reproduction', sections 10.1-10.5_
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