Question

Consider the life cycle of a cell. when the memory cells of the immune system are not activated or responding to a pathogen exposure, what phase of the cell cycle are they likely in? justify your reasoning

Answer 1

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Answer 2

Ans.

Memory cells of immune system are present in G0 phase, in which these cells are not activated or responding for a pathogen.

The cell-cycle is defined as the series of events that lead to DNA duplication and division of a cell to form daughter cells. The cell cycle is divided into interphase and M phase.

The interphase includes gap 1 (G 1) phase, S or synthesis phase, and gap 2 (G 2) phase, while M phase includes karyokinesis and cytokinesis.

The cells after M phase either goes for next cell division or G1 phase or for G 0 (gap 0) phase. The G0 phase is resting phase, in which cells show a quiescent state.

As memory cells are present in resting phase, till the next exposure of same antigen, these cells are in G0 phase of cell cycle.