Read Cytokinesis and the Actin Ring
A concise NSEB read for cytokinesis and the actin ring. Learn the key idea, then apply it in the linked practice.
Living-system questions are solved by matching a structure or organism to its function, process and stated condition.
Core idea
Animal-cell cytokinesis forms an actin–myosin contractile ring that constricts to create the cleavage furrow. Cytochalasin B disrupts actin polymerisation, so it interferes directly with furrow formation rather than DNA synthesis or spindle–kinetochore attachment.
Cytokinesis
Predict cell-cycle step most affected by cytochalasin B. Cytochalasin B disrupts actin polymerization. The contractile ring that forms the cleavage furrow during cytokinesis is composed primarily of actin and myosin. Spindle microtubules, DNA synthesis and chromosome attachment are much less directly dependent on actin. Hence D. Page 4
OlympIQ exam lens
- ✓Animal-cell cytokinesis forms an actin–myosin contractile ring that constricts to create the cleavage furrow.
Use the information in the question and the stated assumptions before choosing an answer.
Ready to try the pattern?
100% coverage across the linked question.
Practise the linked question