Question

In animal cells, cytokinesis involves:

• A. The separation of sister chromatids
• B. The contraction of the contractile ring of microfilament
• C. Depolymerisation of kinetochore microtubules
• D. A protein kinase that phosphorylates other enzymes

Answer 1

The correct option is B The contraction of the contractile ring of microfilament

In animal cells, cytokinesis is achieved through the constriction of the cell by a ring of contractile microfilaments consisting of actin and myosin. The process can be divided to the following distinct steps; anaphase spindle reorganization, actin-myosin ring assembly and contraction, and abscission.
In animal cells, during anaphase there is separation of sister chromatids. During metaphase, microtubules associated with kinetochores undergo depolymerization. Protein kinases play a major role in cellular activation processes. Kinase is an enzyme that phosphorylates proteins. Phosphatase is an enzyme that dephosphorylates proteins, effectively undoing the action of kinase.
So, the correct answer is option b.