Yeast Information Essay Example For Students

Yeast Information Essay Scientific name -Kingdom- Fungi, Phylum- Ascomycota Class- Ascomycetes Order- Saccharomycetaler, Family- Saccharomycetaceae, Genus- Saccharomyces, Species- CervisiaeDescription Yeast is a unicellular organism that lacks chloroplasts. They are so small that it cant be seen by the naked eye and they are so small that it would take 4000 of them lined up side by side to measure an inch. Habitat Yeast lives on and is nourished by dead or living plant or animal matter. The ideal conditions of yeast is high humidity and temperature, plus lots of food. In bad conditions though the yeast produces a second cell wall for protection and the yeast contents divides into four parts; the parts are called ascospores. Then when favorable conditions return the ascospores burst to reproduce. Yeast gets their food from simple sugars, such as prutrose and destrose. These sugars are found in grapes and other fruits. They abstract the sugars out of the fruit by breaking the fruit down to double sugars then breaking those down to simple sugars. In this process they produce alcohol and CO2.Life cycle Yeast reproduces by budding. We will write a custom essay on Yeast Information specifically for you for only $16.38 $13.9/page Order now This is where the adult yeast begins to swell on its surface. Then part of the parent begins to bud and a wall is formed between the parent and the new yeast. Then the new yeast may do one of two things. It may break away from the parent or it may stay attached to form a chain or a cluster. Budding is very quick. It takes about 20 minutes to produce new yeast.Importance Yeast is used in many different types of commercial uses. Some of them are in banking to get breads and cakes to rise, in beer production in Germany, and wine production. Wine producers dont use wild yeast because they have some unfavorable traits. So they kill off the wild yeast and use yeast that have been domesticated to the needs of the production process.Bibliography Stew Scherer Yeast.com, Yahoo, Windows 95, 2-11-99

Independent and Dependent Variable Examples

Independent and Dependent Variable Examples The independent variable and dependent variable are examined in an experiment using the scientific method, so its important to know what they are and how to use them. Here are the definitions for independent and dependent variables, examples of each variable, and the explanation for how to graph them. Independent Variable The independent variable is the condition that you change in an experiment. It is the variable you control. It is called independent because its value does not depend on and is not affected by the state of any other variable in the experiment. Sometimes you may hear this variable called the controlled variable because it is the one that is changed. Do not confuse it with a control variable, which is a variable that is purposely held constant so that it cant affect the outcome of the experiment. Dependent Variable The dependent variable is the condition that you measure in an experiment. You are assessing how it responds to a change in the independent variable, so you can think of it as depending on the independent variable. Sometimes the dependent variable is called the responding variable. Independent and Dependent Variable Examples In a study to determine whether how long a student sleeps affects test scores, the independent variable is the length of time spent sleeping while the dependent variable is the test score.You want to compare brands of paper towels, to see which holds the most liquid. The independent variable in your experiment would be the brand of paper towel. The dependent variable would be the amount of liquid absorbed by a paper towel.In an experiment to determine how far people can see into the infrared part of the spectrum, the wavelength of light is the independent variable and whether the light is observed (the response) is the dependent variable.If you want to know whether caffeine affects your appetite, the presence/absence of the amount of caffeine would be the independent variable. How hungry you are would be the dependent variable.You want to determine whether a chemical is essential for rat nutrition, so you design an experiment. The presence/absence of the chemical is the independent v ariable. The health of the rat (whether it lives and can reproduce) is the dependent variable. If you determine the substance is necessary for proper nutrition, a follow-up experiment would be to determine how much of the chemical is needed. Here, the amount of chemical would be the independent variable and the rat health would be the dependent variable. How to Tell the Independent and Dependent Variable Apart If you are having a hard time identifying which variable is the independent variable and which is the dependent variable, remember the dependent variable is the one affected by a change in the independent variable. If you write out the variables in a sentence that shows cause and effect, the independent variable causes the effect on the dependent variable. If you have the variables in the wrong order, the sentence wont make sense. Independent variable causes an effect on the dependent variable. Example: How long you sleep (independent variable) affects your test score (dependent variable). This makes sense, but: Example: Your test score affects how long you sleep. This doesnt really make sense (unless you cant sleep because you are worried you failed a test, but that would be a whole other experiment). How to Plot Variables on a Graph There is a standard method for graphing the independent and dependent variable. The x-axis is the independent variable, while the y-axis is the dependent variable. You can use the DRY MIX acronym to help remember how to graph variables: DRY MIX DÂ   dependent variableRÂ   responding variableYÂ   graph on the vertical or y-axis MÂ   manipulated variableIÂ   independent variableXÂ   graph on the horizontal or x-axis Test your understanding with the scientific method quiz.