The organisms first believed to live on Earth were the Prokaryotes. Prokaryotes have many differences and similarities to a Eukaryote. For an example‚ their names sound similar yet they are not the same so that makes them different. Since there are so many organisms‚ the organisms are separated into those two broad categories. Prokaryotes are nearly always a unicellular organisms. An example of a Prokaryote is bacteria and archaea . Prokaryotes do not contain a nucleus or a membrane that should
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`Biology B1 Revision Classification • Organisms were based into groups based on their characteristics (classification). • Kingdom‚ Phylum‚ Class‚ Order‚ Family‚ Genus‚ Species Kingdom Main Characteristics Animalia Multicellular; heterotrophic feeders so no chlorophyll‚ no cell walls; complex cell structure with nucleus Plantae Multicellular; autotrophic feeders using chlorophyll; cell walls made of cellulose; complex cell structure with nucleus Fungi Multicellular; cell walls not made
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have cell walls composed of chitin The cytoplasm is continuous along the hyphae with no end cell wall or membrane Protoctista: Challenges the idea that a cell is specialised A cell capable of all necessary functions Amoeba Single celled organisms have one region of cytoplasm surrounded by a cell membrane. The protoctista cell is unusual in that it performs all functions. Such cells are usually much larger than other cells such that some biologist consider them ’acellular’‚ that is
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very large‚ diverse group of organisms‚ including the plant-like protists (algae)‚ fungi-like protists‚ and the animal-like protists (protozoans). They are all eukaryotic‚ and most are unicellular. Traditional taxonomy of protists (Kingdom Protista) did not accurately represent evolutionary relationships‚ so the classification of this group is unsettled. Modern taxonomy has rearranged the group formerly known as Kingdom Protista‚ separating the different types of organisms into their own candidate Kingdoms
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CH 17 BIOLOGY VOCABULARY AND ASSESSMENT CH 17 SEC 1 1. Binomial nomenclature: Linnaeus’s system of naming organisms‚ giving a scientific two-word name to each species- the first part being the genus‚ and the second the species 2. Class: taxonomic group that contains one or more related orders 3. Classification: grouping of organisms or objects based on a set of criteria that helps organize‚ communicate‚ and retain information 4. Division: taxonomic term used instead of phylum to group related
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Chapter 18 Outline: Diversity and Variation 18.1 The Species Concept TAXONOMY- classifying organisms in ways that reflect relationships and help distinguish one type of organism from another. SPECIES- group of organisms that is capable of breeding offspring‚ or mating‚ with another in nature to produce fertile offspring. Individual members of a species may look very different from eachother. Such differences among members of a species are known as variations Natural selection
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Microscopy Introduction What is life? What are the key factors that biologists have defined that apply to every single organism on the planet? In the 17th century‚ due to the amazing advancement of the microscope‚ biologists created a theory to differentiate the living from the non-living called the cell theory. One concept from the theory is that all living organisms are composed of one or more cells. The importance of studying cells is akin to the importance of studying life. By being able
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the idea that different organisms were related by descent‚ he devised a system that placed these organisms in a hierarchy. Through classification systems‚ scientist have found it easier to find answers to important questions. This way things are broken down more and easier to learn. Classification is the systematic grouping of organisms into catagories on the basis of evolutionary or structural relationships between them. The benefit of classifying organism is it makes the study
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LIFE ON EARTH REVISION Analysis of the oldest sedimentary rocks provides evidence for the origin of life. - Identify the relationship between the conditions on early Earth and the origin of organic molecules. - Formation of the organic molecule was the first event in the evolution of life. - The molecules provided a building block for cell formation and the food for the earliest life. - Present day life’s atmosphere contains: - Oxygen - Water - Carbon
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of organisms present in different ecosystem. Diversity of plants and animals the diversity of plants ’(flora) and animals’(fauna)’ ia region depends on climate‚altitude‚soils and the presence of other species.it is the richest in the tropics. biodiversity found on earth today is the result of 4billion years of evolution.the origon of lifeis not well known to science‚ though limited evidencs suggests that until 600million years ago‚ all life consisted of bacteria and similar unicellular organisms
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