UCSD essay - Makoto Eo(403-840-083) Abdullah...

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Makoto Eo(403-840-083) Abdullah Abed(803-697-484 Sameer Patel ( 003-649-425) Life Sciences 2 Section 2G Michelle Kim 02.09.10 The Effect of light on Goldfish Metabolism Introduction In living organisms, metabolism is the process that is defined as the sum total of all chemical reactions that constantly occur within the body. Two types of metabolic reactions take place in order for organs and cells to carry out their necessary and proper functions. Anabolic reactions link simple molecules together and are responsible for the synthesis of more complex molecules such as proteins. Energy is captured and stored within chemical bonds that can be later released for a cell demanding energy. Catabolic reactions, on the other hand, serve to break down these complex molecules into simpler ones in order to obtain energy that can be used to perform work. While anabolic reactions require an input of energy and capture it in the form of chemical bonds, catabolic pathways release this stored energy by breaking these bonds. In many cases, the energy released in catabolic reactions is used to carry out anabolic reactions. The energy required to carry out these reactions is attained through respiration, in which organisms acquire oxygen at a specific rate that directly rates to its metabolic rate. In this experiment, we measured the metabolic rates in a number of goldfish as we provided extra light from a lamp into their
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environment to see its effect on metabolic rate. We used goldfish as our subjects since they are poikilothermic organisms whose body temperature adjusts along with environmental temperature changes, and so it would be considerably easier to manipulate and measure metabolic rates for this species. They are also fairly easy to get a hold of and would not cost too much money to buy in large numbers. If we were to use homeothermic organisms whose body temperatures remain independent of environmental temperature changes, it would be difficult to influence and induce changes within their metabolic rates because such changes would most likely require digesting certain drugs to cause internal metabolic changes. We will use an electronic acquisition data tool called “LoggerLite” to periodically measure the amount of oxygen concentration inside the water chamber to indirectly determine metabolic rates. Oxygen concentration is measured rather than carbon dioxide because it is more practical to measure the disappearance of oxygen within a closed chamber. Because the system we are placing the goldfish in is a closed system, the chamber’s oxygen concentration should continue decreasing until the fish utilizes and depletes the water of all its oxygen. Our hypothesis in this lab is that providing extra light from the lamp into the goldfish’s water chamber will increase its oxygen consumption rate, and in doing so, speed up its metabolic rate. The rationale behind our theory is that introducing light to the environment will disrupt their comfort and increase their alertness which will stimulate blood circulation and blood
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This note was uploaded on 06/03/2011 for the course LIFE SCIEN 2 taught by Professor Soliman during the Fall '10 term at UCLA.

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UCSD essay - Makoto Eo(403-840-083) Abdullah...

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