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bio12_sm_10_1
bio12_sm_10_1

... 6. Since it is derived from cholesterol, it is a steroid hormone and should use an internal receptor mechanism, passing through the lipid bilayer plasma membrane and activating a receptor molecule inside the cell’s cytosol or nucleus. 7. Answers may vary according to the hormone students chose to il ...
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here - ScienceA2Z.com
here - ScienceA2Z.com

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... 50) Motor proteins provide for molecular motion in cells by interacting with what types of cellular structures? A) sites of energy production in cellular respiration B) membrane proteins C) ribosomes D) cytoskeletons E) cellulose fibers in the cell wall Answer: D Topic: Concept 6.6 Skill: Knowledge ...
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Marking cell lineages in living tissues

... in three axially adjacent pericycle files when several transverse divisions in single or in axial pairs of pericycle cells are followed by tangential periclinal divisions of an inner pair of derivatives resulting in the inner layer (IL) and outer layer (OL) of LRP cells (Figure 3a). When the marked ...
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Mitosis



Mitosis is a part of the cell cycle in which chromosomes in a cell nucleus are separated into two identical sets of chromosomes, each in its own nucleus. In general, mitosis (division of the nucleus) is often followed by cytokinesis, which divides the cytoplasm, organelles and cell membrane into two new cells containing roughly equal shares of these cellular components. Mitosis and cytokinesis together define the mitotic (M) phase of an animal cell cycle—the division of the mother cell into two daughter cells, genetically identical to each other and to their parent cell.The process of mitosis is divided into stages corresponding to the completion of one set of activities and the start of the next. These stages are prophase, prometaphase, metaphase, anaphase, and telophase. During mitosis, the chromosomes, which have already duplicated, condense and attach to fibers that pull one copy of each chromosome to opposite sides of the cell. The result is two genetically identical daughter nuclei. The cell may then divide by cytokinesis to produce two daughter cells. Producing three or more daughter cells instead of normal two is a mitotic error called tripolar mitosis or multipolar mitosis (direct cell triplication / multiplication). Other errors during mitosis can induce apoptosis (programmed cell death) or cause mutations. Certain types of cancer can arise from such mutations.Mitosis occurs only in eukaryotic cells and the process varies in different organisms. For example, animals undergo an ""open"" mitosis, where the nuclear envelope breaks down before the chromosomes separate, while fungi undergo a ""closed"" mitosis, where chromosomes divide within an intact cell nucleus. Furthermore, most animal cells undergo a shape change, known as mitotic cell rounding, to adopt a near spherical morphology at the start of mitosis. Prokaryotic cells, which lack a nucleus, divide by a different process called binary fission.
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