development of the microscope on the development of cell theory. Over a period of nearly 400 years‚ technology has impacted so significantly on humanities understanding of life. This is due to the development of the microscope‚ examining the invisible‚ discovering the building blocks of life‚ and the creation of the cell theory. This theory is so fundamental to our current knowledge of the functioning of living organisms. The development of cell theory is closely linked to the improvements of the microscope
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Cell Theory - Biology Speech on Cell Theory. Cells are the "building blocks" of the body. A human is made of millions of cells‚ which are adapted for different functions. They are composed mainly of a cell membrane‚ cytoplasm‚ vacuole(s) and a nucleus. They are the foundations of all living organisms‚ making them probably cells extremely significant when it comes to biology. They are one of the foundations of biology itself. The Cell Theory is a theory that has been composed‚ changed and altered
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CELL THEORY – STEM CELLS Stem cells are a large focus of study in today’s biomedical world. “They are cells that exist in an undifferentiated state‚ and transform into differing tissue types depending on what the cells surrounding them are‚“ (National Institute of Health‚ 2012). Stem cells have the remarkable potential to develop into many different cell types in the body during early life and growth. In addition‚ they also serve as an internal repair mechanism inside many tissues‚ dividing without
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Chapter 2 IB Biology 2.1 Cell Theory 2.1.1 Outline the cell theory (2). • All organisms are composed of one or more cells • Cells are the smallest units of life • All cells come from preexisting cells • TOK: cell theory replaces the former ideas of spontaneous generation or abiogenesis in which inanimate matter assembles itself into living forms • Exception: muscle cells- more than 1 nucleus‚ very long; (fungal cells) hyphae roots- not a single unit; protoctista- not specialized to single
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knowledge and understanding of the cell theory The technological advancements‚ in the scientific field‚ have opened opportunities for scientists to accumulate knowledge and understanding of the cell theory and have thus provided justification to the living organisms that exist. Notably‚ prior to the proposal of the cell theory‚ limited knowledge and understanding of what humans comprised of was evident and thus the theory of spontaneous generation was brought forth. This theory‚ which has been disproved
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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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Discovering Cells Directions: answer the following questions using complete sentences. Use pages 6C-13C of your textbook. 1. What are cells? 2. When was the first microscope invented? 3. What is a microscope? 4. What is the difference between a simple and compound microscope? 5. Who was one of the first people to observe cells? 6. What did Anton van Leeuwenhoek discover? 7. A Scanning Tunneling Microscope (STM)
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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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