CELL STRUCTURES AND FUNCTION
CELL DIVISION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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protein synthesis, organelle number increase, cell size increases, Cyclin D is expressed
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DNA is replicated, triggered by Cyclin A
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protein synthesis, organelle number increase, cell size increases, Cyclin B is expressed to promote spindle formation
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Separation of sister chromatids into genetically identical nuclei
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Detailed explanation-1: -S phase (Synthesis Phase) is the phase of the cell cycle in which DNA is replicated, occurring between G1 phase and G2 phase. Since accurate duplication of the genome is critical to successful cell division, the processes that occur during S-phase are tightly regulated and widely conserved.
Detailed explanation-2: -The S phase of a cell cycle occurs during interphase, before mitosis or meiosis, and is responsible for the synthesis or replication of DNA. In this way, the genetic material of a cell is doubled before it enters mitosis or meiosis, allowing there to be enough DNA to be split into daughter cells.
Detailed explanation-3: -S phase is the period during which DNA replication occurs.
Detailed explanation-4: -Once activated, the S phase cyclins Clb5 and Clb6 in complex with Cdk phosphorylate Sld2 and Sld3 to initiate the formation of the Sld2–Sld3–Dpb11 complex. This complex mediates the activation of DNA replication66–68. Cyclin specificity has an important role in ordering cell cycle events18.
Detailed explanation-5: -The levels of S cyclins remain high, not only throughout S phase, but through G2 and early mitosis as well to promote early events in mitosis. M cyclin concentrations rise as the cell begins to enter mitosis and the concentrations peak at metaphase.