Question

Given below are the sets of five terms rewrite the terms in a logical sequence as directed at the end of a statement.

Karyokinesis, S-phase, Cytokinesis, G₁-phase, G₂-phase (cell cycle)

Answer 1

Phases of cell cycle:

There are two phases in which cell cycle is divided - interphase and mitotic phase.

Interphase:

1. It is the longest phase of the cell cycle.
2. The interphase is divided into three stages: G₁ phase, S phase and G₂ phase.

G₁-phase:

1. It is the first growth phase in which the cell grows in size and prepares itself for replication of DNA and synthesis of RNA and proteins by becoming metabolically active.

S-phase:

1. It is also called as synthesis phase where DNA replication occurs.
2. The chromosomes doubles from 2n to 4n.

G₂-phase:

1. This is the second growth phase which is just prior to mitosis.
2. In this phase, the synthesis of RNA and proteins continues which is required for mitosis.

M-phase or Mitotic phase:

1. All the cell contents are reorganized for cell division.
2. Replicated chromosomes are divided into two daughter cells into two steps: karyokinesis and cytokinesis.

Karyokinesis: In this, the nucleus is divided.

Cytokinesis: In this cytoplasm is divided.

Thus, the correct order is G₁-phase, S-phase, G₂-phase, karyokinesis and cytokinesis.