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Main Curriculum Tie:
Background For Teachers:
Bacteria, yeasts, and molds can be found everywhere. Scientists have gathered them from clouds above mountain tops and in the deepest parts of the ocean. They are present on animals, people, floors, doorknobs, and even in the air we breathe.
How small are microorganisms? Molds can be seen with only slight magnification and the use of an ordinary magnifying glass. Yeasts must be viewed through a microscope that magnifies several hundred times. Bacteria can best be seen when studied with a more powerful microscope that enlarges at least 1,000 times.
A microscope capable of magnifying 500 times must be used in order to see a single bacterial cell. However, if that cell is allowed to grow on suitable food or solid media, it will reproduce rapidly into a colony consisting of millions of cells. The colony is visible to the naked eye.
Microorganisms have a direct impact on our daily lives. Some are helpful. They aid our bodily processes by helping to break down complex foods into simpler substances.
Intended Learning Outcomes:
The students will do a PREASSESSMENT to determine their current knowledge about three main types of microorganisms.
The teacher will introduce the use of scientific equipment such as: microscopes, balance beam scales, pick glasses and slides, petri dishes, etc.
The students will grow bacteria cultures on agar in petri dishes and do a plate count:
The students will participate in a YOGURT-making lab to show HOW BACTERIA PRODUCE LACTIC ACID.
After preparing the dish, they will complete a worksheet (ORIENTAL RECIPES WORKSHEET) and identify examples of fungi, food fermentation, and the role of microorganisms in the dish prepared.
The students will participate in a BACTERIAL FERMENTATION TASTING LAB by making REUBEN SANDWICHES. Note that the sauerkraut, pickle, and olives all involve bacteria in the process of fermentation that produce their special flavors.
NOTE TO TEACHER: This should be pass/fail, and all answers are acceptable as each student probably has a different background.
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