#7 Function and general structure of the organelles or their component. a. -Nuclear membrane: double membrane each composed of lipid bi-layer; Pores in the envelope and outer membranes are continuous. -Nucleus: contains most of DNA in eukaryotic cells -Nucleolus: site of ribosomal RNA production & assembly of Ribosome components -Chromatin: mix of proteins and DNA that condense and form into chromosomes before division. b. Ribosomes: particles made of ribosomal RNA & proteins;
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Cells, Exchange and Transport Cell Structure State the resolution and magnification that can be achieved by a light microscope, a transmission electron microscope and a scanning electron microscope; | Light microscope | TEM | SEM | Resolution | 200nm | 0.1nm | 0.1nm | Magnification | X1500 | X250 000 | X100 000 | Explain the difference between magnification and resolution; Magnification: How much bigger the image is than
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Cell membrane - forms the outer covering of the cell, and is semi-permeable. Cytoplasm - is a gel-like matrix where all the other cell organelles are suspended inside the cell. Nucleus - contains the hereditary material DNA and directs the activities of the cell. Centrioles - organize the microtubules assembly during cell division. Endoplasmic Reticulum - are a network of membranes composed of rough and smooth endoplasmic reticulum. Golgi complex - is responsible for storing, packaging
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CELLS AND ORGANELLES Cell Membrane: consist of a lipid bilayer. Hydrophobic tails are located in the interior. Transmembrane protiens are anchored to the core of the bilayer and can be removed only by detergents that disrupt the bilayer. Peripheral membrane proteins are attatched to the cell surface electrostatically and are easily removed by altering the pH. Eucaryotic cells with outer- and intra- cellular membranes ~ half the cell’s total volume -separate intracellular organelles Nucleus-
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Compare the structure of prokaryotic and eukaryotic. (290) There are two major types of cell: eukaryotic and prokaryotic. Eukaryotic cells have many membrane-bounded organelles within the cell. Whereas prokaryotic cells do not have any membrane-bounded organelles. The only membrane in prokaryotic is plasma(cell)membrane. Prokaryotes with the size of 5㎛(1-10㎛) are much smaller than eukaryotic cells with the size of 10㎛(10-100㎛). They both have a cell wall but with different composition. Prokaryotic
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Structures in All Eukaryotic Cells We're going to start with eukaryotic cells even though they tend to be more complex than prokaryotic. But, there is a method to our madness: you are a eukaryote and have eukaryotic cells, so we thought you might relate better. And, eukaryotic comes before prokaryotic alphabetically. Come up with whatever reasons you want for it, but eukaryotes are up first. Tough cookies. Eukaryotic Cell Structure and Function A cell is defined as eukaryotic if it has a membrane-bound
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absence of organelles and the structure of cell walls and membranes that differentiate a prokaryote and a eukaryote. Prokaryote comes from the Greek word meaning pre nucleus. The DNA is not enclosed within a membrane has a singular circularly arranged chromosome. Prokaryotes DNA does not contain histones but does have other proteins. They divide by binary fission, this is when the DNA is copied and the cell divides into two cells. The prokaryote does not contain a membrane-enclosed organelle. The prokaryote
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Intracellular organelles have membranes included in their structure? How would the breakdown of the membranes of these structures affect the function of Joseph’s heart cells? Every intracellular organelle has membranes, with ATPase’s transferring calcium from the cytosol to the endoplasmic reticulum in cardiac muscle cells. Without the membrane the levels would just rise without channels in the membrane to regulate them causing an overload that would attack cytoskeleton. If the structure is broke down
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4. Find a media piece—article, video, presentation, song, or other—that compares structures and functions of different cell types. Include the link or reference citation for the piece and describe how it helped you better compare structures and functions of different cell types. [pic] 5. Discuss what life means to you after completing questions 1–4. [pic] -----------------------
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single cell; including most bacteria) or multicellular (including plants and animals). Humans contain about 10 trillion cells. Cells are of two types – Prokaryotic cells and Eukaryotic cells. Prokaryotic cells lack a nucleus and membrane bound organelles like endoplasmic reticulum , golgi apparatus and so on, example bacteria . Eukaryotic cells possess a nucleus and membrane
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