Describe the events in each phase for Cell Cycle A. Compare the steps in mitosis and meiosis for Cell Cycle B. Cells : Behind the membrane Cells are said to be the building blocks of life. They are the bricks and mortar that bring the universe together as a whole.
Virtual Lab: The Cell Cycle and Cancer
The Cell Cycle | Biology I
The two main phases that occur during a cell cycle are interphase and mitosis. During most of a cell cycle, the cell spends a majority of its time in interphase resting in the cell cycle. Within interphase, the cell goes through 3 phases; 2 growth phases and DNA replication. During Interphase the cell goes through its first gap phase G1. During G1 protein and RNA synthesis occurs so that the cell can grow and mature. Cooper, Geoffrey M G1 is very important because it controls the rate at which.
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In prophase the nuclear envelope breaks down and the nucleolus disintegrates, then the centrosome which is known as the microtubule organising centre, copies itself and these move to opposite poles of the cell and these help to form the mitotic spindle. The chromosomes supercoil and are seen as two identical sister chromatids held together by their centromeres GENIE, The next stage prometaphase involves the chromosomes lining up in the middle of the cell on the metaphase plate, the mitotic spindle fibres then bind to the kinetochores of the chromosomes. The kinetochore is the centre of the chromosome.
As described in the central dogma of biology, information from a gene can be used to build a protein in a two-step process. Transcription is considered to be the first step of gene expression. The process of eukaryotic transcription can be separated into three phases, initiation, elongation and termination. This complex process involves various cell signaling methods as well as the activity of many enzymes.