CELL DIVISION
THE CELL CYCLE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Macromolecules are synthesized
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The DNA replicates
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The nucleus divides
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The entire cell divides
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Detailed explanation-1: -During G1 synthesis of ATP nucleotides, amino acids, RNAs and protein synthesis occur and growth of nucleus is observed.
Detailed explanation-2: -During the G1 phase, the cell grows in size and synthesizes mRNA and protein that are required for DNA synthesis and for this process, DNA polymerase is needed.
Detailed explanation-3: -The G1 phase is often referred to as the growth phase, because this is the time in which a cell grows. During this phase, the cell synthesizes various enzymes and nutrients that are needed later on for DNA replication and cell division.
Detailed explanation-4: -During interphase, G1 involves cell growth and protein synthesis, the S phase involves DNA replication and the replication of the centrosome, and G2 involves further growth and protein synthesis. The mitotic phase follows interphase.
Detailed explanation-5: –G1 phase-In this part of interphase, the cell synthesizes rRNA, mRNA, ribosomes and proteins in preparation for subsequent steps leading to mitosis. The metabolic rate, synthesis of enzymes and ATP storage is high. Increases in ATP synthesis occur in this phase.