Definition of Microorganism Microorganism (from the Greek: mikrós‚ "small" and organismós‚ "organism") is an organism that is microscopic (usually too small to be seen by the naked human eye). Microorganisms live in all parts of the biosphere where there is liquid water‚ including soil‚ hot springs‚ on the ocean floor‚ high in the atmosphere and deep inside rocks within the Earth’s crust. Microorganisms are critical to nutrient recycling in ecosystems as they act as decomposers
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natural science concerned with the study of life and living organisms‚ including their structure‚ function‚ growth‚ evolution‚ distribution‚ and taxonomy. * The cell is the basic structural and functional unit of all known living organisms. It is the smallest unit of life that is classified as a living thing (except virus‚ which consists only from DNA/RNA covered by protein and lipids)‚ and is often called the building block of life. Organisms can be classified as unicellular (consisting of a single
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biological unit of all known living organisms. Cells are the smallest unit of life that is classified as a living thing‚ and are often called the "building blocks of life". Discoverer: The cell was discovered by Robert Hooke in 1665. The cell theory‚ first developed in 1839 by Matthias Jakob Schleiden andTheodor Schwann‚ states that all organisms are composed of one or more cells‚ that all cells come from preexisting cells‚ that vital functions of an organism occur within cells‚ and that all cells
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into more than one kingdom? In the early days of biology‚ all organisms were classified as either plants or animals. Single-celled eukaryotic organisms such as algae and Paramecium were assigned to one of the kingdoms according to whether they are photosynthetic or not. Fungi and prokaryotes were grouped with plants‚ because fungi are sedentary and prokaryotes have cell walls. A five-kingdom scheme was devised because some organisms don’t fit well into a two-kingdom system of classification. The
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8.4 - Life on Earth: Prerequisite Knowledge: • Discuss evidence that present-day organisms have developed from different organisms in the distant past: Comparison of the physiology of fossils to present day organisms have showed relationships between the organisms The examination of the DNA structure of organisms has shown the development from past organisms. • Describe the conditions under which fossils form: Fossils are any remains of past life found in rocks of different
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1. BIOLOGICAL CLASSIFICATION Aristotle’s classification - Aristotle was the earliest to attempt a more scientific basis for classification of organisms. - He classified plants into trees‚ shrubs & herbs and animals into two groups‚ those which had red blood and those that did not. Two-kingdom classification - In Linnaeus’ time Two Kingdom classification (Kingdom Plantae & Kingdom Animalia) was developed. Drawbacks of 2-kingdom classification Prokaryotes (Bacteria‚ cyanobacteria) and eukaryotes
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over time 1. Living things are based on a universal genetic code a) All organisms sore the complex information they need to live‚ grow and reproduce in a genetic code written in a molecule called DNA. b) That information is copied and passed from parent to offspring c) With a few minor variations‚ life’s genetic code is almost identical in every organism on Earth 2. Living things grow and develop a) Every organism has a particular pattern of growth and development b) During development‚
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of atoms and molecules that differs from the mixture of chemicals in the environment surrounding the cell. Organisms: independent living things‚ simplest forms of independent life are single-celled organisms Multicellular organisms are more complex organisms‚ having many kinds of cells‚ such as muscle cells‚ nerve cells‚ and gland cells. During the development of multicellular organisms‚ each cell differentiates or becomes specialized to carry out a particular function; body is made up
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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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behavioral or other attributes survived over those who didn’t (Natural Selection) What evidence is there to support the theory of evolution through natural selection? - Fossil- are preserved remains‚ tracks‚ or traces of once-living organisms o Most direct evidence of macroevolution o By dating the rock we can get an accurate idea of how old the fossil is (history of evolutionary change) - Anatomical- reveals similarities between structures of species
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