OBJECTIVE LIFE SCIENCE
CELL BIOLOGY
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
Spindle fibers disappear
|
|
|
Duplicated chromosomes pull apart alone the metaphase plate
|
|
|
The nuclear membrane disappears
|
|
|
The duplicated chromosomes line up among the metaphase plate in the middle of the cell
|
Detailed explanation-1: -Metaphase. Chromosomes line up at the metaphase plate, under tension from the mitotic spindle. The two sister chromatids of each chromosome are captured by microtubules from opposite spindle poles. In metaphase, the spindle has captured all the chromosomes and lined them up at the middle of the cell, ready to divide.
Detailed explanation-2: -The equatorial position of the metaphase plate ensures symmetric cell divisions.
Detailed explanation-3: -As mitosis progresses, the microtubules attach to the chromosomes, which have already duplicated their DNA and aligned across the center of the cell. The spindle tubules then shorten and move toward the poles of the cell. As they move, they pull the one copy of each chromosome with them to opposite poles of the cell.