Energy Requiring Phase
Energy Requiring Phase - Related Videos
01:20
Energy-requiring Steps of Glycolysis
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2019
Glucose is the source of nearly all energy used by organisms. The first step of converting glucose into usable energy is called glycolysis. Glycolysis occurs in the cytosol of the cell over two phases: an energy-requiring phase and an energy-releasing phase. Over the first three steps, glucose is converted into different forms and attached to two phosphate groups donated by two ATP molecules, resulting in an unstable sugar. In the next two stages, the unstable sugar splits into two sugar...
02:31
Phase Transitions
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2020
Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to occupy...
01:21
Free Energy
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2019
Free energy—abbreviated as G for the scientist Gibbs who discovered it—is a measurement of useful energy that can be extracted from a reaction to do work. It is the energy in a chemical reaction that is available after entropy is accounted for. Reactions that take in energy are considered endergonic and reactions that release energy are exergonic. Plants carry out endergonic reactions by taking in sunlight and carbon dioxide to produce glucose and oxygen. Animals, in turn, break down the...
01:30
Capital Requirement
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2025
Capital requirements are regulatory standards that compel banks to maintain a minimum amount of capital relative to the risks they assume. This ensures banks can absorb potential losses without collapsing, thereby protecting depositors and maintaining financial stability.The Capital Adequacy Ratio is the primary measure used to evaluate a bank’s capital strength. It is calculated as:Risk Weighting Risk weighting assigns different values to assets depending on their risk profile:Low-risk assets,...
02:33
Phase Transitions: Sublimation and Deposition
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2020
Some solids can transition directly into the gaseous state, bypassing the liquid state, via a process known as sublimation. At room temperature and standard pressure, a piece of dry ice (solid CO2) sublimes, appearing to gradually disappear without ever forming any liquid. Snow and ice sublimate at temperatures below the melting point of water, a slow process that may be accelerated by winds and the reduced atmospheric pressures at high altitudes. When solid iodine is warmed, the solid sublimes...
FAQs
The phase uses one ATP to phosphorylate glucose and a second ATP to phosphorylate fructose-6-phosphate. The first reaction produces fructose-6-phosphate, while the second produces fructose-1,6-bisphosphate. Tracking these two additions clarifies where the pathway invests energy and how the original glucose molecule becomes chemically prepared for the next stage.
ATP investment creates activated sugar intermediates rather than providing an immediate energy return. Fructose-1,6-bisphosphate is the key product formed after the second phosphorylation, and its altered state prepares the six-carbon molecule for cleavage. This arrangement allows glycolysis to transition from an initial energy cost to a later phase that generates ATP and NADH.
Fructose-1,6-bisphosphate is the activated intermediate produced at the end of the investment stage. Its formation prepares the six-carbon sugar for cleavage into smaller molecules during the subsequent part of glycolysis. That structural transition is important because the later energy-yielding phase depends on intermediates produced after this preparation step.
The first phase has a temporary energy cost because two ATP molecules are consumed before any ATP or NADH is produced. The later phase reverses the immediate direction of energy flow by generating ATP and NADH. Viewing glycolysis as a sequence of investment followed by return prevents the initial ATP consumption from being mistaken for the pathway’s overall outcome.
Begin with glucose, follow its ATP-dependent conversion to fructose-6-phosphate, and then track the second ATP-dependent conversion to fructose-1,6-bisphosphate. Next, identify cleavage of the activated six-carbon intermediate as the transition toward the energy-yielding phase. This sequence provides a practical framework for reading glycolysis diagrams and locating the two ATP investments.
The energy-requiring phase shows how cells prepare glucose for downstream energy capture. It connects the initial handling of a six-carbon sugar with the later production of ATP and NADH, making the pathway’s timing easier to understand. In biology, this sequence helps explain how glucose conversion is organized within a central metabolic pathway.