21 - Signal transduction pathway proteins DNA binding...

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Hormones called growth factors also signal cells to divide or not by a similar pathway. In either case, built into the cell cycle are natural stop points that your book calls “checkpoints”. Muscle and nerve cells are arrested during the Gap1 phase. These cells have no need to be primed for further division. During embryonic development, many cells are arrested just prior to cell division or just prior to cytokinesis. No chromosomes detected at G1 arrest and cell is diploid. No chromosomes detected at G2 arrest but cell is quadraploid. Chromosomes detected at M check point. How many copies? 1 Signal transduction pathway proteins Nuclear membrane bound protein Membrane bound protein DNA binding protein
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MEIOSIS Meiosis is the reduction of a diploid cell to a haploid cell by the process of cell division. What would happen during sexual reproduction if meiosis did not occur? First, what is sexual reproduction? The combining of DNA from two parents; Male and Female. An egg and sperm cell [gametes] combine to form a new
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21 - Signal transduction pathway proteins DNA binding...

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