Question

1. which stage or phase of the cell cycle corresponds to each of the descriptions below? a) a new cell wall begins to form. b) the membrane of the nucleus dissolves. c) daughter chromosomes begin to separate. d) the cell begins to pinch together along its centre. e) thick chromosome threads are visible in two distinct regions of the cell. f) the cell grows and copies its dna.

Explanation:

• a) Plant cell cytokinesis involves cell wall formation.
• b) Prophase starts nuclear membrane breakdown.
• c) Anaphase is defined by chromatid separation.
• d) Animal cell cytokinesis has membrane pinching.
• e) Telophase has chromosomes in two new nuclear regions.
• f) Interphase is growth and DNA replication phase.

Answer:

a) Cytokinesis (in plant cells, specifically the formation of the cell plate which develops into the cell wall).
b) Prophase (nuclear membrane dissolves to allow chromosome movement).
c) Anaphase (sister chromatids (daughter chromosomes) separate and move to opposite poles).
d) Cytokinesis (in animal cells, the cell membrane pinches in, forming a cleavage furrow).
e) Telophase (chromosomes decondense and are visible in two regions as new nuclei form).
f) Interphase (G₁ for growth, S for DNA replication, G₂ for preparation; overall cell grows and copies DNA).