Most centipedes need to live in moist places, but a few can survive in deserts and dry grasslands. 1  These animals are found in the following types of habitat. 2  temperate. 3  tropical. terrestrial.  Terrestrial 1  Biomes. taiga.  desert or 1  dune. chaparral. 2  forest. rainforest. 3  scrub forest.  mountains.
Yeast are among the few living organisms that do not need oxygen in order to produce energy. This oxygen-independent state is called anaerobic (pronounced a-na-ROE-bik; without oxygen). During such anaerobic conditions, yeast convert carbohydratesâstarches and sugarsâto alcohol and carbon dioxide gas. This process is known as fermentation. The fermentation process of yeast is caused by enzymes, catalysts in chemical reactions similar to the digestive enzymes in the human body.
The yeast inthis flask will use up the oxygen inside the flask and willferment glucose to produce carbon dioxide. The CO 2 will displacethe remaining air, which will bubble out through the water. Thisflask will not contain oxygen after the first hour or two of theexperiment.EACHER REFERENCE PAGES-YEAST FERMENTATION LAB. Biology Yeast Lab, Page 13 4/26/01 produces carbonic acid and drops the pH of the solution.After 24 hours, the production of CO 2 can be demonstrated inthe anaerobic yeast culture as follows:1. Place 50 mL of Bromothymol blue solution into a 125 mLErlenmeyer flask.2.