Answer :
Answer: B) The mitotic spindle is a structure made of microtubules that segregates chromosomes into the daughter cells during mitosis.
Explanation: The mitotic spindle (also known as spindle fibers) is made up of microtubules, which are in turn made up of protein filaments. These spindles are very important during cell division.
After prophase has occurred during mitosis, the mitotic spindles are responsible for attaching to chromosomes and aligning them in the middle of the cell during metaphase. In addition, during anaphase and telophase, the spindles are also responsible for equally dividing the chromosomes between each half of the cell by pulling each chromosome to their respective half of the cell. Thus, choice B best describes the function of the mitotic spindle.
Choice A is incorrect because mitotic spindles play no role in aiding DNA replication. DNA replication is instead performed by other proteins, such as helicase and DNA polymerase.
Choice C is incorrect because mitotic spindles do not make up the structure of the nuclear membrane. Instead, the nuclear membrane is made up of a phospholipid bilayer with protein channels interspersed throughout.
Choice D is incorrect because mitotic spindles are not enzymes and they do not play a role in catalyzing reactions. They do not split the cell membrane during cytokinesis, as this function is instead carried out by actin and myosin protein filaments.
