Cell Cycle and Mitosis Quiz

Which phase of the cell cycle is the longest?

• G₂

• M phase

• Interphase

• Cytokinesis

What happens during the S phase?

• Cell divides

• Spindle fibers form

• DNA is replicated

• Chromosomes align

Which checkpoint ensures correct DNA replication before mitosis?

• G₁ checkpoint

• G₂ checkpoint

• M checkpoint

• S checkpoint

During G₁ phase, the cell mainly:

• Replicates DNA

• Divides

• Grows and metabolizes

• Forms spindle fibers

What controls progression of the cell cycle?

• Kinetochores

• Centrosomes

• Cyclin-kinase complex

• Spindle fibers

If no signal at G₁ checkpoint, cell enters:

• M phase

• S phase

• Cytokinesis

• G₀ phase

Which is NOT checked at G₁ checkpoint?

• Energy

• Cell size

• Spindle formation

• DNA damage

Sequence of interphase stages:

• S → G₂ → G₁

• G₂ → S → G₁

• G₁ → S → G₂

• G₀ → S → M

Which does not occur in G₂ phase?

• DNA replication

• Energy storage

• Spindle protein synthesis

• Centrosome replication

Cytokinesis is:

• Nuclear division

• Genetic division

• Chromatid separation

• Cytoplasm division