Lab Report4-AppConTemp

Lab Report4-AppConTemp - Lab Report #4 Template...

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Lab Report #4 Template Investigating Cellular Respiration Lab group report responsibilities: Primary author of section I (Overview) = Eugenia Soliterman Primary author of section II (Results) = Fady Ghali Primary author of section III (Conclusions) = Emily Smith Overview: Questions: 1 (addressed in lab): Is more carbon dioxide produced when the body is at rest or after intense exercise? 2 (associated w/ topic): If there is more carbon dioxide produced after exercise, how much more exactly? 3 (follow-up): Do different fitness levels affect the amount of carbon dioxide released after exercise? Approach: (write approach here) Initially we tested for the presence of carbon dioxide in seeds, leaves with light, leaves without light, a cricket, a pebble, and a seedling to see if our hypotheses were correct. We did this by seeing if the cabbage extract solution was affected by a change in pH. The blue color represented no change in pH and the purple color represented an acidic environment. CO2 makes the pH in cabbage extract solution acidic so if the color of the extract was purple we knew that CO2 was present. The reason CO2 in the extract makes the solution acidic is because CO2 combines with water to form carbonic acid which is acidic. In our next experiment we tested for the presence of CO2 in the air, in our exhaling, and in our breath after extreme exercise. We did this my mixing the gases with cabbage extract solution. As in the previous experiment, blue meant no change in pH and purple meant acidic. The air was supposed to already have CO2 because it is a product of respiration and our breath was supposed to have more CO2 after extreme exercise because more oxygen was taken in to supply for the cells doing exercise and therefore had more CO2 released. In our next experiment we tested if the yeast cells performed respiration by putting
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This note was uploaded on 04/06/2008 for the course BIO 161 taught by Professor Black during the Winter '08 term at Cal Poly.

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Lab Report4-AppConTemp - Lab Report #4 Template...

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