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Describe the structure and life processes of bacteria Bacterial cells like plant cells are surrounded by a cell wall However bacterial cell walls are made up of polysaccharide chains linked to amino acids while plant cell walls are made up of cellulose which contains no amino acids Many bacteria secrete a slimy capsule around the outside of the cell wall The capsule provides additional protection for the cell Many of the bacteria that cause diseases in animals are surrounded by a capsule The capsule prevents the white blood cells and antibodies from destroying the invading bacterium Inside the capsule and the cell wall is the cell membrane In aerobic bacteria the reactions of cellular respiration take place on fingerlike infoldings of the cell membrane Ribosomes are scattered throughout the cytoplasm and the DNA is generally found in the center of the cell Many bacilli and spirilla have flagella which are used for locomotion in water A few types of bacteria that lack flagella move by gliding on a surface However the mechanism of this gliding motion is unknown Most bacteria are aerobic they require free oxygen to carry on cellular respiration Some bacteria called facultatibe anaerobes can live in either the presence or absence of free oxygen They obtain energy either by aerobic respiration when oxygen is present or by fermentation when oxygen is absent Still other bacteria cannot live in the presence of oxygen These are called obligate anaerobes Such bacteria obtain energy only fermentation Through fermentation different groups of bacteria produce a wide variety of organic compounds Besides ethyl alcohol and lactic acid bacterial fermentation can produce acetic acid acetone butyl alcohol glycol butyric acid propionic acid and methane the main component of natural gas Most bacteria are heterotrophic bacteria are either saprophytes or parasites Saprophytes feed on the remains of dead plants and animals and ordinarily do not cause disease They release digestive enzymes onto the organic matter The enzymes breakdown the
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