Scientists isolate two different cells from the same organism at different points in the cell cycle. Cell A has 1.5 times the DNA content of cell B. Which of the following is true? Scientists isolate two different cells from the same organism at different points in the cell cycle. Cell A has 1.5 times the DNA content of cell B. Which of the following is true? cell A is in S phase; cell B is in G2 phase cell B is in G1 phase; cell A is in G1 phase cell A is in S phase; cell B is in G1 phase cell B is in S phase; cell A is in G1 phase cell A is in G1 phase; cell B is in G2 phase

cell A is in S phase; cell B is in G1 phase

Explanation:

The cell cycle refers to the series of events that takes place in a cell from the duplication of DNA to cytokinesis (division of cytoplasm). The cell cycle occurs in stages characterized by different activities occuring in the cell.

The cell initially undergoes the Interphase or resting phase, which comprises of the:

G1 phase: where the cell undergoes physical enlargement

S phase: The genetic material (DNA) of the cell duplicates or doubles at this stage i.e. ×2

Hence, if the scientists isolate different cells from the same organism and cell A contains 1.5 times cell B's DNA, it means that cell A has entered the Synthesis phase or S phase where it is currently undergoing DNA replication which cell B is still at the G1 phase and is yet to proceed to the S phase.

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