NEET BIOLOGY

CELL STRUCTURES AND FUNCTION

CELL DIVISION

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Microtubules ____ during telophase
A
Break down
B
Build up from centrosomes
C
Either A or B
D
None of the above
Explanation: 

Detailed explanation-1: -Telophase is also marked by the dissolution of the kinetochore microtubules and the continued elongation of the polar microtubules. As the nuclear envelopes re-form, the chromosomes begin to decondense and become more diffuse.

Detailed explanation-2: -During telophase, the chromosomes begin to decondense, the spindle breaks down, and the nuclear membranes and nucleoli re-form. The cytoplasm of the mother cell divides to form two daughter cells, each containing the same number and kind of chromosomes as the mother cell.

Detailed explanation-3: -Some cellular proteins act to disassemble microtubules, either by severing microtubules or by increasing the rate of tubulin depolymerization from microtubule ends. Other proteins (called microtubule-associated proteins or MAPs) bind to microtubules and increase their stability.

Detailed explanation-4: -During prophase, when levels of mitotic kinase activity rise, interphase microtubules were gradually disassembled, in part as a result of phosphorylation-induced inactivation of the microtubule stabiliser Ensconsin/MAP7.

There is 1 question to complete.