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Chemical Reactions in Anatomy & Physiology

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  • What is a synthesis (anabolism) reaction?

    A reaction where smaller particles bond together to form larger, more complex molecules, such as amino acids forming proteins.

  • What is a decomposition (catabolism) reaction?

    A reaction where bonds in larger molecules are broken down into smaller, less complex molecules, like glycogen breaking down into glucose.

  • What are exchange (displacement) reactions?

    Reactions where bonds are both made and broken, involving synthesis and decomposition, such as ATP transferring a phosphate to glucose.

  • What role do enzymes play in chemical reactions?

    Enzymes act as biological catalysts that lower activation energy and speed up reactions without being consumed.

  • How does an enzyme affect activation energy in a reaction?

    Enzymes reduce the activation energy required, allowing reactions to proceed faster and more efficiently.

  • What is the enzyme-substrate complex?

    A temporary structure formed when a substrate binds to the active site of an enzyme during a reaction.

  • What happens during a dehydration synthesis reaction?

    Two molecules are joined together with the removal of water as a product.

  • What is hydrolysis in decomposition reactions?

    Water is split and used to break bonds in larger molecules, forming smaller products.

  • What is activation energy?

    The minimum energy required for reactants to start a chemical reaction.

  • How does temperature affect the rate of chemical reactions?

    Increasing temperature raises kinetic energy, causing molecules to collide more frequently and with greater force, speeding up reactions.

  • How does reactant concentration influence reaction rate?

    Higher reactant concentration increases the frequency of collisions, thus increasing the reaction rate.

  • What is the difference between irreversible and reversible chemical reactions?

    Irreversible reactions proceed only from reactants to products, while reversible reactions can proceed in both directions.

  • What is chemical equilibrium?

    The state where the rate of product formation equals the rate of reactant formation in a reversible reaction.

  • What is the significance of ATP in exchange reactions?

    ATP transfers phosphate groups to other molecules, facilitating energy transfer in cells.

  • What is the role of water in chemical reactions?

    Water participates in hydrolysis and dehydration synthesis reactions and acts as a solvent and medium for transport.

  • What is the difference between hydrophilic and hydrophobic substances?

    Hydrophilic substances attract water, while hydrophobic substances repel water.

  • What is the function of catalysts in chemical reactions?

    Catalysts increase the rate of chemical reactions without being permanently changed or consumed.

  • What is the relationship between potential energy of reactants and products in chemical reactions?

    If reactants have less potential energy than products, energy is added; if more, energy is released.

  • What is the difference between a solution, colloid, and suspension?

    Solutions are uniform mixtures, colloids have dispersed particles that do not settle, and suspensions have particles that separate unless stirred.

  • What is the significance of enzyme specificity?

    Enzymes bind only specific substrates at their active sites, ensuring precise biochemical reactions.