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06. Euglena Notes
06. Euglena Notes

... Euglena are unicellular organisms classified into the Kingdom Protista. All euglena have chloroplasts and can make their own food by photosynthesis. They are not completely autotrophic (able to make their own food) though; euglena can also absorb food from their environment. Euglena usually live in ...
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Tonicity, which is directly related to the osmolarity of a

... solute particles; a solution with high osmolarity has fewer water molecules with respect to solute particles. In a situation in which solutions of two different osmolarities are separated by a membranepermeable to water, though not to the solute, water will move from the side of the membrane with lo ...
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Lecture 6 Notes CH.6

... • 6.3 The eukaryotic cell's genetic instructions are housed in the nucleus and carried out by the ribosomes • 6.4 The endomembrane system regulates protein traffic and performs metabolic functions in the cell • 6.5 Mitochondria and chloroplasts change energy from one form to another • 6.6 The cytosk ...
Biological Kingdoms
Biological Kingdoms

... them different from other eukaryotic organisms. One of the main differences is that they are autotrophic, meaning they are able to make their own food using simple inorganic substances. They do this through a process known as photosynthesis, in which plants convert sunlight, water, and carbon dioxid ...
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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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