what is common in both photosynthesis and aerobic respiration? A-chemiosmosis B-
ID: 14293 • Letter: W
Question
what is common in both photosynthesis and aerobic respiration?A-chemiosmosis
B- CO2 and O2 as end products
C- thylakoids
D- NADP+ and NADH
E- glycolysis
Explanation / Answer
They can be thought of as the 'reverse' of each other (though their repective biochemical pathways are in no ways similar) and are the two halves of the carbon cycle. Respiration: Glucose + Oxygen -> Carbon dioxide + Water Photosynthesis: Carbon dioxide + Water -> Glucose +Oxygen They both have an electron transport chain to make ATP Photosynthesis and (Aerobic) Respiration: These two processes have many things in common. 1. occur in organelles that seem to be descended from bacteria (endosymbiont theory): chloroplasts and mitochondria 2. The organelles where these processes occur have complex internal membrane systems that are essential to the processes. 3. These processes rely on existing molecules in cells to carry out the energy conversion reactions: electron holders (NAD + , NADP + ), ADP and ATP, miscellaneous sugars, etc. 4. Photosynthesis and respiration are essentially the reverse of each other. Photosynthesis starts with CO2 and reduces it to sugar; reduction requires energy, which is obtained from light. Respiration starts with sugar and oxidizes it to CO2 ; oxidation releases energy which is collected as ATP ANOTHER REFERENCE: Photosynthesis is the conversion of light energy into chemical energy by living organisms. The raw materials are carbon dioxide and water; the energy source is sunlight; and the end-products are oxygen and (energy rich) carbohydrates, for example sucrose, glucose and starch. This process is arguably the most important biochemical pathway,since nearly all life on Earth either directly or indirectly depends on it. It is a complex process occurring in higher plants, phytoplankton, algae, as well as bacteria such as cyanobacteria. Photosynthetic organisms are also referred to as photoautotrophs. A commonly used but slightly simplified equation for photosynthesis is: 6 CO2(g) + 12 H2O(l) + photons ? C6H12O6(aq) + 6 O2(g) + 6 H2O(l) carbon dioxide + water + light energy ? glucose + oxygen + water Aerobic respiration Cellular respiration describes the metabolic reactions and processes that take place in a cell or across the cell membrane to get biochemical energy from fuel molecules and the release of the cells' waste products. Energy can be released by the oxidation of multiple fuel molecules and is stored as "high-energy" carriers. The reactions involved in respiration are catabolic reactions in metabolism. Simplified Reaction: C6H12O6 (aq) + 6O2 (g) ? 6CO2 (g) + 6H2O (l) ?Hc -2880 kJ P.S. Observe the reactions involved. Youll see they both are reverse of each other yet have some elements in common
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