Celluar Metabolism

Topics: Cellular respiration, Photosynthesis, Adenosine triphosphate Pages: 2 (780 words) Published: December 9, 2012
My Cellular Metabolism Paper
By Carter St.John

Energy is needed for all living systems to survive. Most of this energy is provided by the sun, both directly and indirectly. The flow of energy in the ecosystem consists of energy of the sunlight being caught and used to make organic compounds. These organic compounds store it as chemical energy that feeds living organisms. The two main pathways that allow cells to make and or use energy are photosynthesis and cellular respiration.

Photosynthesis is a process that converts light energy into chemical energy and storing it in the bonds of sugar. The process takes place in the chloroplasts, using chlorophyll which is the green pigment. It consists of three stages. The first stage is when energy is captured from the sun. The second stage is when energy is temporarily stored in ATP (adenosine triphosphate) and NADPH. In the third stage organic compounds are made using ATP, NSDPH, and carbon dioxide. The equation for photosynthesis is: 6CO2 (carbon dioxide) + 6H2O(water) →(light) → C6H12O8(sugars) + 6O2(oxygen gas). This is the source of the oxygen that we breathe in. The structures of the chloroplast include the outer and inner membranes, intermembrane space, stroma, and the thylakoids stacked in the grana. The chlorophyll is built into the membranes of the thylakoids. The plant looks yellow and green because the plant absorbs red and blue light, which makes these colors to be seen by our eyes. It is the green and yellow light that is not absorbed that enables us to see a green plant. Light reactions occur the thylakoid membrane, which are in first and second stages, which are light-dependent. The pigments absorb light and pass its energy to the central chlorophyll to do photosynthesis. This energy is stored in ATP. In the third stage of photosynthesis a dark reaction takes place within the chloroplast and converts carbon dioxide to sugar. It does not need light, but it needs the...
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