CELL STRUCTURES AND FUNCTION
CELL CYCLE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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a cell doubles in size
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chromosomes form
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DNA replicates
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None of the above
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Detailed explanation-1: -G1 is followed by S phase (synthesis), during which DNA replication takes place. The completion of DNA synthesis is followed by the G2 phase (gap 2), during which cell growth continues and proteins are synthesized in preparation for mitosis.
Detailed explanation-2: -The S phase of the cell cycle occurs before the interphase and is involved in DNA synthesis or replication. In this way, the genetic material of the cell is replicated before entering mitosis or meiosis, leaving enough DNA to divide into daughter cells. S phase is not initiated until the cell passes the G1 phase.
Detailed explanation-3: -In S phase, the cell synthesizes a complete copy of the DNA in its nucleus. It also duplicates a microtubule-organizing structure called the centrosome.
Detailed explanation-4: -S phase : The replication phase is known as the S phase. DNA replication consumes the majority of the cell’s resources.
Detailed explanation-5: -During the S phase, DNA is duplicated into two sister chromatids, and centrosomes, which give rise to the mitotic spindle, are also replicated. In the G2 phase, energy is replenished, new proteins are synthesized, the cytoskeleton is dismantled, and additional growth occurs.