Spontaneous Generation and Cell Theory 1. Tradition thought is very hard to overcome- even with solid evidence to support new ideas * Social pressure has effect on acceptance of scientific ideas and technological advancements * Science is a social/political enterprise * New ideas often met with resistance * Sometimes ostracisms‚ persecution‚ death * Microscope helped to overturn some strange ideas * Disease processes * "spontaneous
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2.1 Cell Theory 2.1.1 Outline the cell theory The three main principles of the cell theory are: * All organisms are composed of one or more cells * Cells are the smallest units of life * All cells come from pre-existing cells New Concepts * Cells contain the blueprint for their own growth‚ development and behavior * Cells are the site of all the chemical reactions needed to sustain life * Cells (and multicellular organisms) show emergent properties – appears as complexity
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7-1‚ 7-2 Cell Structures and Function cell theory- all living things are composed of cells‚ cells are the basic units of structure and function in living things‚ new cells are produced from existing cells. prokaryote- smaller and simpler than eukaryotes‚ do not contain nuclei‚ are part of the Bacteria domain‚ are unicellular‚ are autotrophs or heterotrophs eukaryote- cells with nuclei and contain specialized structures called organells. All plants‚ animals and fungi are eukaryotes. Part of the
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Approach To Basho’s Haiku: Principle and Western Ideas Ordinarily‚ it is mostly common for readers new to haiku‚ particularly Basho’s haiku‚ to find it immensely difficult to understand. Substantially‚ it is for good reasons to find difficulty with Basho‘s haiku. For one‚ it forms a mental images in the readers mind arousing… An Approach to Basho’s Haiku: Principles and Western Ideas Ordinarily‚ it is mostly common for readers new to haiku‚ particularly Basho’s haiku‚ to find it immensely
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Schwann and M.J. Schleiden introduced the cell theory; the theory that individual cells make up all tissues.1 However‚ due to the lack of staining techniques at the time‚ not much was known about nervous tissue and many scientists wondered if it even conformed to the same rules followed by all the other cells in the body. Two major theories were proposed regarding the nervous system: the reticular theory by Josef van Gerlach‚ and the neuron doctrine theory.1 Eventually‚ in 1873‚ an Italian scientist
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Cells Cells Cell division and cancer Victoria Brothwell Strayer University Cells Introduction Regular cells and cancel cells are extremely different. Depending on the cancer that one may have cancer cells have more chromosomes that are scattered which is for why cancer cells are formed. In cell division all living things obtain cells in which come from other preexisting cells. If normal cells are do not divide and make new cells then cancer will occur. In order of all cells to be
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3.1 Cell Theory KEY CONCEPT Cells are the Basic unit of life. 3.1 Cell Theory 3.1 Objectives Describe developments that led to the cell theory. Differentiate between eukaryotic and prokaryotic cells. 3.1 Cell Theory The cell theory grew out of the work of many scientists and improvements in the microscope. • Many scientists contributed to the cell theory. 3.1 Cell Theory The cell theory grew out of the work of many scientists and improvements in the microscope. • Many scientists
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Cells‚ Cell Division‚ and Cell Specialization Fundamentally Different Types of Cell Prokaryotic Cell- single celled: only DNA+ structure (“before nucleus”) E.g. zygote-complete DNA Eukaryotic Cell-multi-celled (“after nucleus”) Prokaryotes Eukaryotes DNA In “nucleoid” region Within membrane-bound nucleus Chromosomes Single‚ circular Multiple‚ linear Organelles None Membrane-bound organelles Size Usually smaller Usually larger- 50 times Organization Usually single-celled Often multicellular
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Biology Notes 1. Organisms are made of cells that have similar structural characteristics. 1 Outline the historical development of the cell theory‚ in particular the contributions of Robert Hooke and Robert Brown. The development of the cell theory starts in the 1600ʼs with Robert Hookeʼs discovery of cells when viewing a piece of cork under a microscope and describing them as a nun house. Anton van Leeuwenhoek was crucial in the development of microscopes making simple microscopes through advanced
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possible‚ that cancer cells have the same characteristics as normal stem cells and that is why they grow and invade rapidly? And if so can scientist and doctors use this information to find a permanent cure or a better way to stop cancer? The vague knowledge about how cancer is formed is that our healthy genes are suddenly mutated. They are most likely mutated during a process called mitosis. Mitosis is apart of the cell life cycle. First‚ a cells
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