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. Imagine that an extraterrestrial life-form has been recovered from a meteorite by a deep space probe that has a

ravenous appetite for sand. Your job is to come up with a preliminary analysis of its bioenergetic pathway. On close examination you note that the biochemical pathway employed by this creature has some features in common with your own. You note that the alien has a basic cellular structure similar to that of Earth-based creatures. It has what you would consider to be a cytoplasm, nucleus, and other basic organelles. In addition, the creature appears to be capable of using oxygen in the course of its metabolism. Following a rigorous biochemical analysis, you note the following points: a. A glycolysis like process begins with the alien's basic food stuff of sand particles. Specifically, the first molecule in the pathway contains 210 silicon atoms (Si210). b. In the process of metabolizing the Si210, you note that the creature uses up 55 energy- carrying molecules that you have named ZTP (since it is an unknown triphosphate-bearing molecule that gives the creature 'zip') in converting the Si210 to 5 molecules of Si42. Also, in the process of breaking down one molecule of Si210, twelve (12) molecules of an electron-carrying substance you have called EADH are formed. c. Each Si42 molecule is broken into two molecules with the creation of 6 ZTP molecules and 4 EADH molecules. Each molecule of Si42 gives off 4 SiO2 molecules in this step (Si19 left). d. Each Si19 goes through a cyclic process in an organelle similar in structure to our own mitochondrion in which the Si19 is completely oxidized to SiO2. In the process, 7 ZTP, 6 EADH, and 8 EADH2 are released. e. Each molecule of EADH is converted to 12 ZTP, and each molecule of EADH2 is converted to 6 ZTP. (NOTE: Each EADH formed in step (b) is converted to two molecules of EADH2 when it passes into the mitochondrion-like structure.) How many ZTP and SiO2 molecules will be formed in the complete metabolism of 1 molecule of Si210? Show all your work in the space below. Include in your calculations appropriate silicon related names for each of the key steps. [20 Application Marks]

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