Cellular Respiration Biology Paper

Topics: Energy, Carbon dioxide, Cellular respiration Pages: 8 (1580 words) Published: September 17, 2014

What Is Cellular Respiration and What Influences It’s Function?

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Eating is a basic essential of life that most people don’t pay much mind till they’re hungry. Eating is essential and very important for various reasons but one of the main reasons is for energy. Our bodies use a term called cellular respiration which is the process by which chemical energy of food is released and partially captured in the form of ATP or energy. Throughout the experiment that was conducted the principles of cellular respiration and how temperature affects it was evaluated through the use of crickets. The experiment begins with the obtaining of 10 adults live crickets and placing them in a 250 mL respiration chamber. The necessary weights of the crickets and the respiration chamber were obtained and the process will be explained later in this report. After obtaining weights the experiment of how temperature affects cellular respiration began by measuring the production of Co2 released from the crickets. The system used was a logger Pro System and a Co2 sensor. The crickets were exposed to various temperatures in the order of an ice bath at of 4° C to a cold water bath of 15°C and then water baths with temperatures in the order of 26°C , 30°C, 35°C, 40°C and 45°C. The amount of Co2 at each temperature was recorded and used to graph results of the experiment.


Energy is the ability to cause change, an example being the ability to do work (). Without energy life would really not exist. There are two main types of energy one being potential energy which is stored energy and kinetic energy which is energy in motion. Regardless of the types of energy all living things acquire energy through the same methods with the most abundant supply of energy coming from cellular respiration. Cellular respiration is the catabolic pathways of aerobic and anaerobic respiration, which breaks down organic molecules and uses an electron transport chain to produce ATP(). In basic terms cellular respiration is the process our cells uses to break down foods we eat especially sugars into a form of energy that the cell can use. Cellular respiration is key for cells to be able to perform and happens in 3 stages. Glycolysis, which is the breaking down of sugars which takes place in the cytosol of the cell. Next there is a preparatory phase before stage two in which a 2-carbon acetyl group binds to coenzyme producing acetyl-CoA and then enters the second stage called the kreb cycle. The kreb cycle occurs in the matrix of a double membrane organelle called the Mitochondria. In the kreb cycle completes the breaking of glucose that started in glycolysis by oxidizing acetyl CoA to carbon dioxide. The final stage of cellular respiration is oxidative phosphorylation, which happens in the folds of the mitochondria. These folds are called cristae and maximize surface area for production of ATP. In oxidative phosphorylation electrons from glycolysis and the kreb cycle are carried via NADH and FADH2 (which are electron transporters) to the electron transport chain. It is here where ATP is mostly produced, this happens because a hydrogen gradient is formed and an enzyme called ATP synthase makes ATP. In cellular respiration atoms of sugar molecules are released as carbon dioxide, which was tested in the experiment with the use of ten adult crickets. Crickets are considered ectotherms, ectotherms have a connection with their external environment and their metabolic rate. One example of an external environment that ectotherms adjust to is the temperature outside; this is why many reptiles seem to move slower on cold mornings or anytime throughout the day when the temperatures are colder. Some common examples of ectotherms are reptiles and the crickets used throughout this experiment.

Materials and Methods:

The experiment of measuring carbon dioxide...

Cited: Reece, Jane B., et al. Campbell Biology. 9th edition; International edition. Harlow: Pearson Education, 2011.
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