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Mader/Biology, 10/e – Chapter Outline
Mader/Biology, 10/e – Chapter Outline

... 2. Eukaryotic cells are compartmentalized; they contain small structures called organelles that perform specific functions. 3. The nucleus communicates with ribosomes in the cytoplasm. 4. The organelles of the endomembrane system communicate with one another; each organelle contains its own set of e ...
What is Life
What is Life

... rigid layer that surrounds the cells of plants and some other organisms controls which substances pass into and out of the cell acts as the cell’s control center directing all of the cell’s activities Tiny cell structures that carry out specific functions within a cell allows materials to pass in an ...
“Guided Reading and Study” Student Notes Chapter 2.4, “Looking
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... Mitochondria: Convert energy in food molecules to energy the cell can use to carry out its functions Endoplasmic reticulum: Carries proteins and other materials from one part of the cell to another Ribosomes: Produce proteins Goldi bodies: Receives proteins and other materials from the endoplasmic r ...
Tour Of The Cell
Tour Of The Cell

...  Electron microscope - resolving power is greater since wavelengths of electrons are smaller than those of light ◦ SEM (Scanning Electron Microscope) - 3D image ◦ TEM (Transmission Electron Microscope) - flat internal ultrastructure of cell image ...
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...  Dissolved molecules ( ions, organic molecules, etc) are called solutes  Most solutes cannot cross membranes  As solute conc increases “free” H2O decreases  Hypertonic high [solute]  Hypotonic  low [solute] ...
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CELL ORGANELLE ANALOGY PROJECT RUBERIC

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Video Guide
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... 14. In general, what is the role of proteins in the phospholipid bi-layer? 15. The movement of molecules from an area of __________ concentration to an area of _______ concentration is called _________________. 16. When the cell takes no energy to move molecules into or out of a cell without energy ...
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... Part A. "HOW BIG IS A...." (click on the interactive link "howbig" to access this page) In the photo below, there is a line that says 200 nanometers. This is used to help you determine how big an object is. It works similar to the way a map works. The line represents 200 nanometers, but the object i ...
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... the flagellum to the cell wall and the cytoplasmic membrane. Unlike eukaryotic flagella, the bacterial flagellum has no internal fibrils and does not flex. Instead, the basal body acts as a molecular motor, enabling the flagellum to rotate and propell the bacterium through the surrounding fluid. In ...
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Cytoplasmic streaming



Cytoplasmic streaming, also called protoplasmic streaming and cyclosis, is the directed flow of cytosol (the liquid component of the cytoplasm) and organelles around large fungal and plant cells through the mediation of actin. This movement aids in the delivery of organelles, nutrients, metabolites, genetic information, and other materials to all parts of the cell. Cytoplasmic streaming occurs along actin filaments in the cytoskeleton of the cell.Cytoplasmic streaming was first discovered in the 1830s. The scientific breakthrough assisted scientists in developing an understanding of the different roles of cells and how they function as the basic operating systems of life.This process occurs through the operation of motor proteins called myosins.These proteins use energy of adenosine triphosphate (ATP) to act as a molecular motor, which slides along actin filaments. This works in a manner that tows the organelles and other cytoplasmic contents in the same direction. Myosin proteins consist of two conjoined proteins. If one protein remains attached to the substrate, the substance acted upon by the protein, such as a microfilament, has the ability to move organelles through the cytoplasm.The green alga genus Chara and other genera in the Division Charophyta, such as Coleochaete, are thought to be the closest relatives of land plants. These haploid organisms contain some of the largest plant cells on earth, a single cell of which can reach up to 10 cm in length. The large size of these cells demands an efficient means to distribute resources, which is enabled via cytoplasmic streaming.Cytoplasmic streaming is strongly dependent upon intracellular pH and temperature. It has been observed that the effect of temperature on cytoplasmic streaming created linear variance and dependence at different high temperatures in comparison to low temperatures. This process is complicated, with temperature alterations in the system increasing its efficiency, with other factors such as the transport of ions across the membrane being simultaneously affected. This is due to cells homeostasis depending upon active transport which may be affected at some critical temperatures.In plant cells, chloroplasts may be moved around with the stream, possibly to a position of optimum light absorption for photosynthesis. The rate of motion is usually affected by light exposure, temperature, and pH levels.In reference to pH, because actin and myosin are both proteins, strong dependence on pH is expected. The optimal pH at which cytoplasmic streaming is highest, is achieved at neutral pH and decreases at both low and high pH.The flow of cytoplasm may be stopped by:Adding Lugol's iodine solutionAdding Cytochalasin D (dissolved in dimethyl sulfoxide)↑ ↑ ↑ ↑ ↑ ↑
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