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Brian Heng 10/20/09  Cp bio Compare and Contrast Photosynthesis and cell respiration Even though photosynthesis and cell respiration need each other, both are different because they make different substances. Both are similar and contribute to the environment. Photosynthesis and cell respiration are interdependent contributing to the environment. The photosynthesis makes oxygen for other heterotrophic organisms and it is necessary for the life of these organisms. The organisms exhales carbon which that plants need to make oxygen, so they both need each other. But some differences between these two processes are that cell respiration takes place in the mitochondria. The organism takes in the oxygen and releases carbon. The reactants for cellular respiration are C6H12O6 +O2 and the products are CO2 and water. ATP is required to make cellular respiration start. This takes place in heterotrophs and is essential for life of these organisms because without the carbon that is released the plant would not have the carbon need to make oxygen. Therefore the heterotrophs will die. Another difference is that aerobic respiration is also used. The first stage is gycolysis which requires two ATP molecules. The glycolysis breaks the glucose molecule into pyruvic acid and 4 molecules of ATP. The second stage is the kerbs cycle which produces 2 ATP. The final stage is the electronic transport chain which makes 32 ATP. All of these stages are used to break glucose down into ATP energy and 62% of the energy is released as heat. In the stages the energy stays as kinetic energy. Photosynthesis on the other hand takes in the carbon breathed out by the hetrotroph and the autotrophs use that to make the oxygen and sugar the heterotrophs need. Without carbon autortrophs could not make oxygen. The reactants of photosynthesis are 6CO2+6H2O and the products are sugars and oxygen. Autotrophs are light dependent because they need light energy to perform the process. This takes place in the chloroplast. In the cytoplasm is where glycolysis takes place. This is important to life because without the oxygen provided by the autotrophs the hetrotrophs will die. In the chloroplast there is a thylakoid which is a disk like structures that contain photosynthetic pigments. Surrounding the thylakoid is a gel like substance called the stroma. There are two stages during photosynthesis. The first stage is light reactions which takes in light and water and releases oxygen. The second stage is the Calvin cycle which takes in the CO2 and takes the ATP from the light reactions and uses it to make sugar. As the light reactions happen and as it goes to the Calvin cycle the chemical energy turns into kinetic energy.

These are more alike then you think they are. For instance both create a gas that both need to survive. Also they both create energy for the hetrotroph or the autotroph. Both of these processes are essential for life. They both use or produce glucose. But an imbalance that effects these processes are humans. Humans are releasing more carbon dioxide into the air and cutting more trees down. The less trees or plants the less oxygen is made and the fact that there is more carbon in the atmosphere does not help. Less oxygen leads to breathing problems with hetrotrophs. If this continues many organisms will begin to die off.

Matt Milliron


 * Photosynthesis is a major part of (a) plants life cycle due to plants taking energy from the sun and turning it into ATP, which is then transferred to the mitochondria for packaging. Photosynthesis starts with the reactants which are 6CO2 + 6H20. The products of photosynthesis are C6H12O6 +6O2. Photosynthesis takes in carbon dioxide in from the sun and releases oxygen that humans and animals use to breath. Chloroplasts are the location in the cell that uses photosynthesis to give the cell energy. **
 * This process can only take place in plant cells because animal cells don’t have a cell wall. The first stage of cell respiration is light reaction and then the Calvin Cycle. The light reaction comes first when light comes through the plant cell wall and into the chloroplast. The Calvin cycle occurs next when the CO2 comes into the cell and comes out as CH2O (sugar). The light reaction gives ATP and the Calvin cycle converts it into ADP. Photosynthesis retains mostly to the chloroplast which has a Thylakoid which is a disk that contains photosynthetic pigments. The chloroplast also has another part that has a job with photosynthesis. The Stroma also relates to photosynthesis, which is a gel that is around the outer core of the thylakoids. **
 * Cellular respiration occurs in animal cells because it is what they breathe. Cell respiration can also be thought of to be 6CO2 +6O2 àC6H12O6 =6O2. The products of cellular respiration are 6CO2 +6O2. The reactions of this cell are C6H12O6 +6O2. This process takes place in animal cells in the mitochondria. This process is important to life because if cellular respiration didn’t happen then humans and animals would not be able to convert the Oxygen into carbon dioxide. This is also important to the economy because cars let out CO2 without giving any Oxygen in the process. The three stages of aerobic respiration are glycolysis, citric acid cycle, and electron transport chain. Glycolysis takes place in the cytoplasm and is the first stage. The Krebs cycle and the electric transport chain take place inside the mitochondria. Pyruvic acid is produced from glycolisis during aerobic respiration. This process requires oxygen and has much more energy then gylcolisis. **
 * The differences between photosynthesis and cellular respiration are that photosynthesis only takes place in a heterotroph or plant cell. Cellular respiration only takes place in Autotrophs or animal cells. Photosynthesis uses a cycle called the Calvin cycle and cellular respiration uses a cycle called the Krebs cycle. The economy would really suffer if photosynthesis and cellular respiration were not available due to the amount of heat energy, mechanical energy, and light energy needed to run life. Photosynthesis is includes using light energy as well as heat energy. Cellular respiration uses mechanical energy to get what an animal cell needs. Photosynthesis and cellular respiration are both very important to the survival of life in plant and animal cells because of all of these reasons ****. **

Photosynthesis and Cell Respiration Compare/Contrast
==By S h e r r i e K h a z a n i == P. 7-8   There are many differences and similarities between photosynthesis and cellular respiration. First of all, the products and reactants of photosynthesis are different from that of cellular respiration. The products are carbon dioxide and water, and the reactants are glucose and oxygen. The equation for photosynthesis is 6 CO2 + 6H2O. The location that photosynthesis takes place in is the chloroplast, only in plant, or autotrophic cells. The stoma is a dense area in the choloroplast, and it is a site of conversion of carbon dioxide to sugars. Photosynthesis is important to life because it takes light energy and turns it into energy that is usable by plants. The two stages of photosynthesis are the light dependent reactions and the Calvin Cycle. The light reactions occur in the thylakoids stacks. The Calvin Cycle occur in the stoma. The forms of energy change in the two stages because in light dependent reactions, the sunlight is converted into chemical energy in the form of ATP. The chlorophyll then absorbs the light, and finally oxygen is released through the stomata. Dark reactions, or the Calvin Cycle is when carbon dioxide is changed into sugar using ATP. The carbon is combined with 5 carbon sugar, and the 6 carbon sugar is broken down into 2 molecules which are glucose and fructose. These two molecules combined make sugar. The reactants of cellular respiration are glucose and oxygen. The reactants are carbon dioxide and water. For cellular respiration, the equation is CO 12 O6+6O2. Depending on the metabolic process, it can occur in different parts of the cell. For example, the Krebs Cycle occurs in the mitochondria. Glycolysis occurs in the cytosol, or the cytoplasm. This process is important to life because it makes energy for living organisms, like heterotrophs. It’s the process that releases the chemical energy stored in food and uses it for other energy. It is one of the key ways that cells gain useful energy. The point of cellular respiration is for it to make electrons into organic compounds. This is how any organism gains its energy, by cellular respiration, and this is one of the most vital processes. The stages in aerobic respiration include glycolysis, the Krebs cycle, and finally electron transportation. The forms of energy change in these stages because first, glucose is oxidized and then broken down into pyruvic acid. As the molecules move on to the cycles, more energy is produced. These two process are not only important to the community, they are important to the world. The big idea is that they both create energy in some way for organisms to use, and reuse. Since this energy is reusable, it is a never ending cycle, as long as we have the organisms to make that possible. Another important idea is that they both have processes that the molecules go through in order to achieve making the energy needed. Both occur within the cells, and need organic molecules for their reactants, so they can make new products. Both cell respiration and photosynthesis use some kind of an energy, and make energy; however, photosynthesis uses heat and light energy, and cellular respiration uses chemical energy. We have to be aware that human activities can affect the growth of the organisms necessary to make cell respiration and photosynthesis possible, because without these processes, humans could not survive.  ==  ==

Zach Sipp 10/20/09 7/8 **__ Compare/Contrast Essay __** There are many similarities and differences between cell respiration and photosynthesis. For example cell respiration does not need light to make energy but photosynthesis does. Some similarities between photosynthesis and cell respiration are that they each depend on each other for survival.

Photosynthesis is the process in which the plant takes light energy and turns it into chemical energy and glucose. The reactants of Photosynthesis are 6CO2+6H2O the product is C6H12O6+6O2. Photosynthesis takes place in the chloroplasts. This takes place in the plant cell. This process is important to life because if we did not have plants then we will die from lack of oxygen. The two stages of Photosynthesis are first sun light and water enter the cell then the light has a reaction and oxygen is released. The energy changes from water and light to ATP and oxygen.

Cellular Respiration is the process where glucose is turned into ATP and chemical energy. The reactants are CO2 and ATP. The products are sugar and ADP. Cellular Respiration is found in the mitochondria. Cellular Respiration takes place in animals. The process is important to life because without it the plants will not have enough energy and die. The process of Cellular Respiration goes from glycolysis to the Krebs cycle to Electron transport. The forms of energy go from glucose to pyruvic acid to lactic acid.

Humans are creating an imbalance in the ecosystem because we are polluting too much which adds a lot of CO2 to the air and blocks the sun’s rays, which in turn killes all the plants because it makes it were there is not enough sunlight to start the chemical reaction, which killes all the animals because there is not enough enough oxygen.

Add more details about cell respiration and photosynthesis and how they affect life. By:Matt Milliron