Water Pollution Water – The Elixir of Life Can you imagine life without water? Take a minute and think about it. We need water for all our daily essential activities – drinking‚ bathing‚ cleaning… In fact‚ every living thing on this planet needs water Water pollution And what do we do with this vital resource? We take its all important ability – we all know that water can dissolve many of the thing that we dump in it – to make it a giant rubbish bin. In fact‚ we even throw things
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pollutants E) all of the choices are correct 5. Plants are dependent on microorganisms A) providing oxygen B) providing water C) changing atmospheric nitrogen to a usable form D) providing carbohydrates 6. Which is usually true of Bacteria? A) They are found as rods‚ spheres‚ or spirals B) They reproduce by binary fission C) They contain rigid cell walls made of petidoglycan D) They are found as single cells E) All of the choices are correct 7. Which is not usually true
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What is Food Microbiology Food microbiology is the study of food micro-organisms; how we can identify and culture them‚ how they live‚ how some infect and cause disease and how we can make use of their activities. Microbes are single-cell organisms so tiny that millions can fit into the eye of a needle. They are the oldest form of life on earth. Microbe fossils date back more than 3.5 billion years to a time when the Earth was covered with oceans that regularly reached the boiling point‚ hundreds
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Amoeba: It is a unicellular protozoan that lacks a definite shape. Live in both fresh water and marine habitats. Some are found in soil‚ and many have adapted to parasitic life on the body of marine animals or internal organs of both aquatic and terrestrial animals. Amoeba reproduces asexually by binary and multiple fissions. They eat algae‚ bacteria‚ other protozoan‚ and tiny particles of dead plant or animal matter. Bacillus: They are rod shaped‚ gram positive bacteria found in soil and water. The
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Cells 1. Cell theory a. Outline the cell theory b. Discuss the evidence for the cell theory c. State that unicellular organisms carry out all the functions of life d. Compare the relative sizes of molecules‚ cell membrane thickness‚ viruses‚ bacteria‚ organelles and cells using the appropriate Sl unit e. Calculate the linear magnification of drawings and the actual size of specimens in images of known magnification f. Explain the importance of the surface area to volume ration as a factor
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Airborne diseases refers to any diseases which are caused by pathogens and transmitted through the air. These viruses and bacteria can be spread through coughing‚ sneezing‚ laughing or through close personal contact. These pathogens ride on either dust particles or small respiratory droplets and can stay suspended in air and or are capable of traveling distances on air currents.[1] Often‚ airborne pathogens or allergens cause inflammation in the nose‚ throat‚ sinuses and the lungs. This is caused
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The ability of humans to manipulate DNA is a mixed blessing Genetically modified organisms are made moving the DNA from one species to another. DNA contains genes which code for proteins. For plants and bacteria; restriction enzymes are used to cut a DNA segment from a desired gene source and a bacterium plasmid. They are joined using ligase enzymes and inserted into the plant chromosome or host bacterium. For animals the recombinant DNA is injected into an embryo and transferred to a recipient
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that causes symptoms and has a negative impact on health. Diseases may be inherited and have a genetic component‚ or can be the result of pathogenic infections. Our lifestyle choice may further exacerbate the risk of contraction of disease. This essay expands on these principles to describe how disease is caused in humans. Pathogens‚ such as bacteria‚ fungi or viruses are agents that cause disease. Pathogens cause disease by gaining entry into the host‚ colonise the tissues‚ resist the host defences
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Species Interaction * The relationships between two species in an ecosystem. * The interactions between two species need not be through direct contact. Species may affect each other through intermediaries such as shared resources or common enemies. Major factors in evolution and adaptation: * Predation * Competition for scarce resources Terminologies: * Habitat – the actual physical location where a species lives. * Conditions – physical or chemical attributes of the
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shown to be largely responsible for enabling oil of oregano to kill various microorganisms under experimental conditions. A dishwashing liquid is to remove stains‚ loosens food remains enough so you can wipe it away with little effort‚ to kill bacteria that sticks in the container. It is a detergent used to assist in dishwashing. It is usually a highly-foaming mixture of surfactants with low skin irritation‚ and is primarily used for hand washing of glasses‚ plates‚ cutlery‚ and cooking utensils in
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