Thursday, February 7, 2008

Activity 3.1 Essay Type Question

How does a change in temperature affect the rate at which yeast go through cellular respiration?



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12 comments:

Christopher Noda said...

Yeast is a single celled organism that undergoes a process called fermentation. In this process fuel or sugar is made from to fuel the yeast. In order for this to happen though the yeast must be at just the right temperature. If the yeast is too hot its cells will start to die off, and if its too cold its cells will start to freeze. From the lab we figured out that Yeast best goes under fermentation in warm temperature but not burning temperature. If the temperature changes in the middle of fermentation the process will have to stop and correct itself before continuing with the process.

Chloe said...

Yeast, since it is single celled does not reproduce like other organisms but though fermentation. the rate that the yeast goes though cellular respiration when its cold is very low and if it gets too cold then it will freeze and make crystals. If it gets over heated then the yeast will stop reproducing and die off. the best temperature for cellular respiration is at or around room temperature.
~julie kemper

Jackie Schechter said...

Yeast goes through a process called fermentation. During this process it consumes sugar and produces carbon dioxide as a waist product. When yeast is placed in cold environments it starts to freeze and its chemical reactions begin to slow. since yeast is a single celled organism its only cell cannot undergo fermentation in cold temperatures because it begins to die. In hot temperatures the yeasts protein cells begin to change shape. Since the protein molecules are responsible for the cells growth, repair, and overall survival the cell begins to die and is not able to undergo fermentation.

DeAnna said...

Yeast, a single-celled organism goes through a type of cellular respiration called fermentation. Cellular respiration is a chemical process within the cells of all organisms, including yeast. Fermentation, the process in which yeast digests sugar. During this yeast cells produce carbon dioxide (C02), as a waste product. Yeast ferments best in warm environmental temperatures. Example: if you put yeast in a pan on a burner on "high".

Suzie said...

All cells go through cellular respiration. Yeast is a single-celled organism that goes through fermentation, a type of cellular respiration. During fermentation, yeast has a series of chemical reactions that allow it to break down sugars and release carbon dioxide as a result. In exteme temperatures, yeast is not able to ferment/survive; yeast in extremely cold temperatures result in the formation of ice crystals, while in extremly hot temperatures, the cells die of heat. When in cold temperatures, yeast do not die, but the rate of chemical reactions slow down (slowing down the process of fermentation). The fermentation of yeast is at its best when in warm/hot temperatures (the process speeds up, and the yeast cells don't die of heat or ice crystals.)

Meagan M. said...

Every organism has a set of optimum, or most favorable, conditions that it lives under. If these conditions change drastically, then the organism will not be able to function as well since it is not adapted to survive in those new circumstances. Yeast thrives in warm temperatures. As my partner and I discovered in Activity 3.1, yeast's rate of fermentation, or the process by which yeast digest sugar to get energy, is the most rapid at around 40 degrees Celsius (when compared to 25 degrees and 10 degrees Celsius), which is a little hotter than the temperature of the human body. If yeast is not in an environment at this temperature, then the rate of fermentation will slow down or stop entirely.

Lucy Lloyd said...

Every organism has an optimum temperature. This temperature is the state at which that organism functions the most efficiently (reproduces, being active etc). The temperature at which yeast is most active is a high temperature and this is probably because as temperature raises, molecules and atoms become more active, causing the cell to expand. This causes cellular respiration.

shruza said...

Yeast, single-celled fungi commonly found on plants, skin, intestines, soil, and water, has an optimum temperature at which it most easily goes through cellular respiration. Yeast goes through a process called fermentation during which the single-celled fungi digest sugar, in order to live and reproduce, producing carbon dioxide gas as a by-product. Cellular respiration takes place in all cells and fermentation that takes place in yeast cells is a form of cellular respiration. Yeast’s optimum temperature for going through fermentation is about 20 degrees Celsius to 45 degrees Celsius according the Science and Sustainability textbook. If the temperature gets much higher than 40 degrees Celsius, the yeast cells begin to die off making them unable to reproduce. If the temperature gets much colder than 20 degrees Celsius, the process of fermentation slows down making it rather ineffective. If yeast is exposed to extremely cold conditions, ice crystals can from within the cell that causes irreparable damage. Yeast functions best at temperatures between 20 and 40 degrees Celsius.

Foster Bundy said...

Yeast, a single-celled fungi goes through a process called fermentation. In this process yeast digests sugars and releases carbon dioxide as a waste product. Yeast has an optimum temperature where this single-celled fungi performs at its best. If the temperature is too cold the cells will freeze and if they are too hot they will die off. So you want a warm optimum temperature but not a boiling one. If the temperature changes in the middle of the process it will have to stop itself and correct it before moving through the process.

Conor Capps said...

Yeast is a signal celled organism/fungi that goes through the process of fermentation. Durring fermentation yeast breaks down sugars then releases carbon dioxide as a waste product. Yeast can't just ferment in any tempature. For example if it is to cold the cells will freeze and the yeast won't be able to ferment. Now if the tempature is to hot the yeast cells will change form and die. So the yeast have a optitum tempature that is not to hot but not to cold.

copalmer said...

Yeast is a single-celled fungi that undergoes the process of fermentation. Yeast ferments best at just under 40 degrees Celsius, it's optimum temperature. If the temperature is hotter or lower than this, the yeast will not ferment as well. Yeast is a poikilotherm (correct me if I'm wrong), so if the temperature is too cold, it's metabolism will decrease (unlike homeotherms, who's metabolism increases the colder the temperature) and the organism will not be able to cellular respirate as quickly. And if the temperature is too hot, the proteins in the yeast will change shape and not operate as well.

Teddy Murphy said...

A change in temperature that is out of yeast’s optimum (most favorable) condition range could affect fermentation. When the temperature gets too high, the protein loses its shape. When temperatures are too cold, the rate of chemical reactions are slowed, which includes fermentation.