Question

Which of the following occurs during metaphase?

A.) chromosomes being aligned under tension at the spindle equator
B.) chromosomes being captured by spindle microtubules
C.) nuclear envelope breakdown
D.) chromosomes being condensed
E.) nuclear envelope reassebly

Answer 1

During metaphase, chromosomes align at the spindle equator, known as the metaphase plate, with sister chromatids maximally condensed and connected by cohesin proteins.

Step-by-step explanation:

During metaphase, the correct event that occurs is chromosomes being aligned under tension at the spindle equator. Specifically, this is referred to as chromosomes lining up at the metaphase plate. At this stage, the chromosomes are maximally condensed and the sister chromatids are still tightly attached to each other by cohesin proteins.

The nuclear envelope has already broken down in an earlier phase, prometaphase, and will not reassemble until telophase. The spindle microtubules, made from proteins called tubulins, attach to each sister chromatid at structures called kinetochores in the previous stage, prometaphase.