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Question
In which of the following phases do the cell organelles increase in number?
In which of the following phases do the cell organelles increase in number?
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Solution
The correct option is C G2 phase
The G1 phase is considered to be the first phase of interphase. It is a phase between the end of the mitotic phase of the previous cycle and the beginning of S- phase of the next cycle. It is the longest among all the phases of interphase. The cell is metabolically active and increases in size continuously. The nucleus however, increases in size to a very small extent. Synthesis of RNA and proteins takes place.
The S- phase is the second phase of interphase. Here, there is the replication of chromosomes i.e the DNA replication takes place. DNA replicates so that the daughter cells can inherit the genetic information from the parent cell. Content of DNA gets doubled but the number of chromosomes remains the same. The chromosomes get duplicated, possessing 2 chromatids, which remain attached to each other at the centromere. Centrioles get doubled. They help to separate the daughter chromosomes during the mitotic phase.
The G2 phase is the third and final phase of interphase. This is the phase after the DNA replication takes place. Here, the DNA replication process stops. Formation of RNA and proteins continue. Cell organelles increase in number. Both the cell and the nucleus grow in size.
In the M- phase; there is karyokinesis (division of nucleus) and cytokinesis (division of cytoplasm).
The G1 phase is considered to be the first phase of interphase. It is a phase between the end of the mitotic phase of the previous cycle and the beginning of S- phase of the next cycle. It is the longest among all the phases of interphase. The cell is metabolically active and increases in size continuously. The nucleus however, increases in size to a very small extent. Synthesis of RNA and proteins takes place.
The S- phase is the second phase of interphase. Here, there is the replication of chromosomes i.e the DNA replication takes place. DNA replicates so that the daughter cells can inherit the genetic information from the parent cell. Content of DNA gets doubled but the number of chromosomes remains the same. The chromosomes get duplicated, possessing 2 chromatids, which remain attached to each other at the centromere. Centrioles get doubled. They help to separate the daughter chromosomes during the mitotic phase.
The G2 phase is the third and final phase of interphase. This is the phase after the DNA replication takes place. Here, the DNA replication process stops. Formation of RNA and proteins continue. Cell organelles increase in number. Both the cell and the nucleus grow in size.
In the M- phase; there is karyokinesis (division of nucleus) and cytokinesis (division of cytoplasm).