ECOLOGY
CHEMICAL CYCLES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Carbon
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Hydrogen
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Oxygen
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Nitrogen
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Detailed explanation-1: -Glycolysis, which is the first step in all types of cellular respiration is anaerobic and does not require oxygen. If oxygen is present, the pathway will continue on to the Krebs cycle and oxidative phosphorylation.
Detailed explanation-2: -The reactant in photosynthesis that provides the carbon atoms to form glucose is atmospheric carbon dioxide gas, or CO2. The other reactant in this chemical reaction is water, H2 O, which provides the hydrogen needed for glucose. Oxygen is provided by carbon dioxide and water as well.
Detailed explanation-3: -Oxygen is needed to help the process of turning glucose into ATP. The initial step releases just two molecules of ATP for each glucose. The later steps release much more ATP. Most of the reactions of cellular respiration are carried out in the mitochondria.
Detailed explanation-4: -Because oxidative phosphorylation is an integral part of the sensory system, glucose sensing is necessarily dependent on oxygen pressure. Much of the dependence on oxygen is suppressed by location of glucose sensing cells in tissues with well-regulated blood flow.