The endosymbiotic theory explains the evolution of the eukaryotic cell and eukaryotic organelles by phagocytocis of small prokaryotic cells. This theory states that some of the organelles in today’s eukaryotic cells were once prokaryotic bacteria. In this theory‚ the first eukaryotic cell was probably an amoeba-like nucleated (probably DNA in a nucleoid region not an actual nucleus) prokaryotic cell that got nutrients by phagocytosis (engulfing nutrients or other cells) Some of these unicellular
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body that holds its own genome and occasionally has mutations‚ this organelle being the mitochondria. The mitochondrial is a semi-autonomous organelle that is believe to have arisen from free-living bacteria this is called the endosymbiotic theory. The endosymbiotic theory is the belief that long ago‚ a bacterium with a nucleus had performed phagocytosis to another organelle and this two membraned specimen later evolved to become the mitochondria. Mitochondrion have 37 genes and their entire DNA
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c------------------------------------------------- Evidence for Endosymbiotic theory: ------------------------------------------------- Evidence that mitochondria and plastids arose from bacteria is as follows:[13][14][15] * New mitochondria and plastids are formed only through a process similar to binary fission. * In some algae‚ such as Euglena‚ the plastids can be destroyed by certain chemicals or prolonged absence of light without otherwise affecting the cell. In such a case‚ the
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Mitochondrion Mitochondrion is an organelle found both in plant and animal cells which provides energy to the cell by cellular respiration. The structure of mitochondrion‚ cellular respiration and the endosymbiotic theory will be discussed in this essay. In comparison with some of the other organelles within the cell‚ mitochondria serve some unique purposes in the function of the cell. Structure As known‚ all organelles have different important structures. Mitochondrion consists of an outer membrane
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Philosophy Ego Theory and Bundle Theory Derek Parfit’s views on personal identity and the Ego and Bundle Theory are all summarized in his article “Divided Minds and the Nature of Persons”. In his article‚ Parfit explains the distinction between Ego theory and Bundle theory and provides several arguments against Ego Theory. Although it proves to be very difficult to believe the Bundle Theory‚ Parfit’s critique is convincing and well thought out. In order to defend the Bundle Theory of personal identity
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1. What is a scientific theory? Please cite a definition you like. As Watson stated in "The Value of Theories"‚ a scientific theory is a systematic explanation that unifies various observed phenomena and facts. Based on observations we make‚ science operates under theories which are constantly revised and checked by experiment. A scientific theory also possesses many vital qualities for true understanding. 2. What is the difference between a scientific theory and common sense ideas about the same
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CULTURAL IMPERIALISM Explanation of Theory: Cultural Imperialism Theory states that Western nations dominate the media around the world which in return has a powerful effect on Third World Cultures by Individual Interpretations: Western Civilization produces the majority of the media (film‚ news‚ comics‚ etc.) because they have the money to do so. The rest of the world purchases those productions because it is cheaper for them to do so rather than produce their own. Therefore‚ Third World countries
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Theories and Hypotheses: The Differences and Similarities Abstract This paper is an examination of theories and hypotheses‚ their differences and similarities. The four major types of theories studied are Deductive‚ Inductive‚ Grounded and Axiomatic. Each type of theories is introduced and explained. Additionally‚ a hypothesis is defined in relation to a theory‚ and the key differences between the two explained. The variables which exist between the theories
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Psychology Theories of Personality 7th Edition Feist−Feist =>? McGraw-Hill McGraw−Hill Primis ISBN−10: 0−39−043533−3 ISBN−13: 978−0−39−043533−0 Text: Theories of Personality‚ Seventh Edition Feist−Feist This book was printed on recycled paper. Psychology http://www.primisonline.com Copyright ©2008 by The McGraw−Hill Companies‚ Inc. All rights reserved. Printed in the United States of America. Except as permitted under the United States Copyright Act of 1976‚ no part of
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structure‚ its size‚ its technology‚ and the requirements of its environment. This perspective is known as "contingency theory" and contrasts with the perspective of classical theorists like Weber‚ Taylor‚ Fayol‚ etc. who thought that there probably was one way to run organizations that was the best. Critics assert that no cohesive contingency theory exists‚ that "contingency theory" is a collection of different ideas that represent a contingency approach‚ which research does not validate because
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