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Bio 126: Energy Flow in Biological Systems

Bio 126: Energy Flow in Biological Systems 2025

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The document outlines a laboratory exercise for Bio 126 focused on enzyme kinetics, specifically the characterization of alkaline phosphatase. It emphasizes the importance of enzymes in metabolic pathways and their role in energy flow within biological systems. The lab involves studying the kinetics of alkaline phosphatase using p-nitrophenolphosphate as a substrate, measuring reaction rates through absorbance changes at 410 nm. Key concepts include initial velocity, Michaelis-Menten kinetics, and determining Km and Vmax values. The document also provides detailed experimental procedures and guidelines for writing a lab report.

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What is biological energy called?

During the light reactions of photosynthesis, energy is provided by a molecule called adenosine triphosphate (ATP), which is the primary energy currency of all cells. Just as the dollar is used as currency to buy goods, cells use molecules of ATP as energy currency to perform immediate work.

What is energy used for in biology?

All living organisms need energy to grow and reproduce, maintain their structures, and respond to their environments. Metabolism is the set of life-sustaining chemical processes that enables organisms transform the chemical energy stored in molecules into energy that can be used for cellular processes.

How does energy flow through biological systems?

Primary producers use energy from the sun to produce their own food in the form of glucose, and then primary producers are eaten by primary consumers who are in turn eaten by secondary consumers, and so on, so that energy flows from one trophic level, or level of the food chain, to the next.

What type of energy is used in biological energy system?

Here, well look at some types of energy that are particularly important in biological systems, including kinetic energy (the energy of motion), potential energy (energy due to position or structure), and chemical energy (the potential energy of chemical bonds).

How is energy transferred in biological systems?

Chemical energy stored within organic molecules such as sugars and fats is transferred and transformed through a series of cellular chemical reactions into energy within molecules of ATP. Energy in ATP molecules is easily accessible to do work.

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What is the energy flow in a biological system?

Energy flow is the flow of energy through living things within an ecosystem. All living organisms can be organized into producers and consumers, and those producers and consumers can further be organized into a food chain. Each of the levels within the food chain is a trophic level.

What type of energy is used in a biological system?

Energy Coupling The synthesis of the many molecules in a functioning cell creates a need for energy in the cell. Cells overcome this energy obstacle by using ATP to drive energy-requiring reactions (Figure 6). The energy needed to drive reactions is harvested in very controlled conditions in enzymes.

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