Presentation on theme: "Oldest Life on Earth Mr. Kempfer 7th Grade Science"— Presentation transcript:
1 Oldest Life on Earth Mr. Kempfer 7th Grade Science MoneransOldest Life on EarthMr. Kempfer7th Grade Science
2 Monerans Single celled No nucleus Most commonly known as Bacteria Appeared 3.5 billion years agoMost numerous organism2.5 billion bacteria in a gram of soilHow are bacteria different from other cells?
3 Types of Bacteria Shapes of bacteria Can be any color Types of BacteriaShapes of bacteriaCoiled, ball, rod, candy-apple, blobsCan be any colorRed, yellow, blue, purpleFound in water, air, soil and other organisms
4 Amazing BacteriaSome bacteria live in volcanoes, boiling water, glaciers, acid pools and at very high pH’sBacteria are simple but still perform all of the functions necessary for life.How would this be an advantage on early Earth?
5 Structure of Bacteria Have a cell wall Protects and gives shape Cell MembraneLets stuff in and outCytoplasmNo nucleusGenetic material just floats in the cytoplasmWhat parts do bacteria share with other cells?
6 Movement of Bacteria Most bacteria can’t move on their own. Moves by air, water or hitches a rideSome have flagellumWhip like tails that propel them through a liquid.Why do bacteria need to move?
7 Life Functions of Bacteria Some need oxygen, some don’tMost are heterotrophsSome are parasitesSome are decomposersSome are autotrophsSome eat sulfur and ironWhy do you think bacteria are so diverse?
8 Reproduction Bacteria reproduce by splitting into 2 Can double their numbers in 20 minutesIn 24 hours could weigh 2 million kilograms!!!In 5 days would weigh more than the Earth!!!?What keeps this from happening?
9 Bacteria in Control Reproduction depends on food supply. When there’s no food, bacteria form an endospore.This is like a suit of armor against the environmentBacteria can survive bleach, boiling, freezing and radiation in an endosporeWhen would a bacteria need an endospore?
10 Bacteria in NatureBacteria are an essential part of the food and energy relationships that link all life on Earth.Decomposers, Producers, food for consumersOxygen producersWhy is this important?
11 PioneersBacteria are the first to move into a new area and populate it.Volcanic areasForest firesSymbiotic RelationshipsHelp us digest foodGive plants nitrogenHow does this help an ecosystem?
12 Bacteria and HumansBacteria are used in the production of food, fuel, medicines and other products.Some, though, can spoil food, cause diseases and poison water.Name a bad bacteria.
13 Bacteria and FoodUsed to make cheese, yogurt, pickles, sour cream, soy sauce, vinegar, high-fructose corn syrup (sugars)Blue-green algae are 70% protein…yum!We heat food to kill bad bacteriaWhat can bad bacteria do to food?
14 Bacteria as FuelCertain bacteria can break down fruit rinds, dead plants, manure and sewage to make methane gas (natural gas)Dead bacteria and other stuff became crude oil in time
15 Medicine Bacteria is used to make anitbiotics Chemicals that poison other bad bacteriaBacteria can cause …Strep throat, pneumonia, tetanus and Lyme disease.Can antibiotics fight a virus?
16 Bacteria and Industry Used to tan leather Extract copper, silver and gold from rockColoring food, cosmetics, removing stains and changing chemicals.Damages asphalt, water and gas pipes and oil drilling machinery.
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