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Questions and Answers
What initiates enzyme catalysis in the process described?
What initiates enzyme catalysis in the process described?
What is the role of the induced-fit mechanism in enzyme activity?
What is the role of the induced-fit mechanism in enzyme activity?
Which reaction is an example of a decomposition reaction as described?
Which reaction is an example of a decomposition reaction as described?
In the synthesis reaction described, what are the products formed?
In the synthesis reaction described, what are the products formed?
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What happens to the enzyme after the products are released?
What happens to the enzyme after the products are released?
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What binds to the enzyme during the reaction process?
What binds to the enzyme during the reaction process?
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During the enzyme-catalyzed reactions, what occurs when the enzyme changes shape?
During the enzyme-catalyzed reactions, what occurs when the enzyme changes shape?
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Which enzyme is specifically involved in the digestion of lactose?
Which enzyme is specifically involved in the digestion of lactose?
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What distinguishes catalyzed reactions from uncatalyzed reactions?
What distinguishes catalyzed reactions from uncatalyzed reactions?
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What is the primary role of the active site of an enzyme?
What is the primary role of the active site of an enzyme?
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In the context of enzyme activity, what is meant by 'enzyme-substrate complex'?
In the context of enzyme activity, what is meant by 'enzyme-substrate complex'?
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Which statement about enzymes is accurate?
Which statement about enzymes is accurate?
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What effect do enzymes typically have on activation energy?
What effect do enzymes typically have on activation energy?
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What characterizes exergonic reactions?
What characterizes exergonic reactions?
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Which statement is true about endergonic reactions?
Which statement is true about endergonic reactions?
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During which type of reaction is energy typically released?
During which type of reaction is energy typically released?
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How does the potential energy change in endergonic reactions?
How does the potential energy change in endergonic reactions?
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If a reaction requires energy to proceed, what type of reaction is it likely to be?
If a reaction requires energy to proceed, what type of reaction is it likely to be?
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Which process is classified as an exergonic reaction?
Which process is classified as an exergonic reaction?
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What occurs to the energy released during an exergonic reaction as products are formed?
What occurs to the energy released during an exergonic reaction as products are formed?
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Which of the following statements describes the energy flow in exergonic and endergonic reactions?
Which of the following statements describes the energy flow in exergonic and endergonic reactions?
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What are the two main components of a chemical equation?
What are the two main components of a chemical equation?
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In a balanced chemical equation, what condition must be met?
In a balanced chemical equation, what condition must be met?
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What is a decomposition reaction?
What is a decomposition reaction?
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Which term refers to the collective term for all chemical reactions occurring in the body?
Which term refers to the collective term for all chemical reactions occurring in the body?
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What characterizes a catabolic reaction?
What characterizes a catabolic reaction?
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What is the role of the arrow in a chemical equation?
What is the role of the arrow in a chemical equation?
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What distinguishes an anabolic reaction from a catabolic reaction?
What distinguishes an anabolic reaction from a catabolic reaction?
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How can chemical reactions be classified based on changes in chemical energy?
How can chemical reactions be classified based on changes in chemical energy?
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What is the primary reason why heat is usually not available to do work?
What is the primary reason why heat is usually not available to do work?
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What does the first law of thermodynamics state?
What does the first law of thermodynamics state?
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When energy is transformed, what happens to some of the energy according to the second law of thermodynamics?
When energy is transformed, what happens to some of the energy according to the second law of thermodynamics?
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Which of the following best describes metabolism?
Which of the following best describes metabolism?
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Which example illustrates the conversion of energy as stated in the first law of thermodynamics?
Which example illustrates the conversion of energy as stated in the first law of thermodynamics?
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What often occurs in the human body as energy is converted from one form to another?
What often occurs in the human body as energy is converted from one form to another?
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In the context of thermodynamics, which scenario best exemplifies the second law?
In the context of thermodynamics, which scenario best exemplifies the second law?
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How does the body's maintenance of homeostasis relate to energy conversion?
How does the body's maintenance of homeostasis relate to energy conversion?
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What is the primary substrate used in the process described?
What is the primary substrate used in the process described?
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What is a likely consequence of severe increases in temperature on enzyme activity?
What is a likely consequence of severe increases in temperature on enzyme activity?
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At what temperature range do human enzymes typically function best?
At what temperature range do human enzymes typically function best?
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What happens to enzyme flexibility as temperature decreases?
What happens to enzyme flexibility as temperature decreases?
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What could be a result of moderate fever on enzyme activity?
What could be a result of moderate fever on enzyme activity?
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Which statement is true regarding the relationship between enzyme temperature and reaction rate?
Which statement is true regarding the relationship between enzyme temperature and reaction rate?
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What is released as a product of the action of glycogen synthase?
What is released as a product of the action of glycogen synthase?
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What are weak intramolecular interactions responsible for in enzyme function?
What are weak intramolecular interactions responsible for in enzyme function?
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Study Notes
Energy, Chemical Reactions, and Cellular Respiration
- Living organisms need energy for various functions, including powering muscles, pumping blood, absorbing nutrients, exchanging gases, synthesizing molecules, and establishing cellular ion concentrations.
- Glucose is broken down through metabolic pathways to form ATP, the cell's energy currency.
Energy: States of Energy
- Energy is the capacity to do work. It exists in two fundamental states:
- Potential energy: Stored energy, related to position.
- Kinetic energy: Energy of motion.
- Energy is convertible between potential and kinetic forms. (E.g., water at the top of a dam possesses potential energy; its movement downstream has kinetic energy.)
- A concentration gradient across a plasma membrane stores potential energy. Sodium ions concentrated outside a cell hold potential energy. Their movement into the cell releases that energy.
Potential Energy and the Plasma Membrane
- Sodium ion concentration gradient across the plasma membrane of a cell.
- The sodium ions outside the cell have potential energy. (analogous to water at the top of a dam)
- The movement of sodium ions from high concentration outside the cell to a lower concentration inside the cell releases kinetic energy.
- This movement can be harnessed to do cellular work.
Energy: Forms of Energy
-
Chemical Energy (A Form of Potential Energy):
- Stored in a molecule's chemical bonds.
- Crucial for cellular processes (movement, synthesis, gradients).
- Released during bond breaking.
- Triglycerides are for long-term energy storage in adipose tissue.
- Glycogen is stored in liver and muscle.
- ATP is stored and used immediately in all cells.
- Protein can be a fuel source, but it has more critical functions.
-
Kinetic Energy Forms:
- Electric energy: Movement of charged particles (e.g., nerve impulses, ion movement across membranes).
- Mechanical energy: Energy of motion in objects/structures (e.g., muscle contraction).
- Sound energy: Compression and vibration of molecules, (e.g., eardrum vibration).
- Radiant energy: Energy of electromagnetic waves (e.g., visible light for vision, UV radiation). Higher frequency light carries more energy. This energy can damage DNA.
- Heat: Kinetic energy of random molecular motion. Typically unusable for work in biological systems.
Energy: Laws of Thermodynamics
- First Law: Energy cannot be created or destroyed, only changed in form.
- Second Law: When energy changes forms, some energy is lost as heat; usable energy decreases, with every transformation.
Chemical Reactions: Chemical Equations
- Metabolism: Collective term for all chemical reactions in the body.
- Chemical reactions: Occur when chemical bonds in molecules break and new bonds form. These changes are summarized in chemical equations.
Chemical Reactions: Classification of Chemical Reactions
-
Classification Based on Changes in Chemical Structure:
- Catabolism: Breakdown of complex molecules to simpler ones.
- Anabolism: Building complex molecules from simpler ones.
-
Classification Based on Changes in Chemical Energy:
- Exergonic reactions: Release more energy than they require; decomposition reactions.
- Endergonic reactions: Absorb more energy than they release; synthesis reactions.
- ATP cycling: Continuous formation and breakdown of ATP, the cell's primary energy currency.
Enzymes
- Function: Biological catalysts that accelerate chemical reactions by lowering activation energy without being consumed in the reaction.
- Mechanism of action: Substrate binds to the enzyme's active site, forming an enzyme-substrate complex. Induced-fit: shape change in the active site stresses existing chemical bonds, allowing new bonds to form. Products are released and the enzyme is ready for another reaction.
Enzymes: Structure and Location
- Enzymes are largely globular proteins.
- The active site is a specific region in the enzyme, allowing only a target substrate shape to bind. This site permits a highly controlled chemical reaction.
Enzymes: Temperature
- Optimal temperature for enzymes that function in the human body is moderate (95-104°F), slightly above the average body temperature.
- Higher temperatures can denature proteins, which alters the enzyme's critical shape.
Enzymes: pH
- Enzymes function best in a narrow pH range.
- Changes in pH can denature proteins, affecting the functioning of the enzyme.
- Optimal pH might vary depending on location within the body (e.g., stomach).
Clinical View: Lactose Intolerance
- Caused by a deficiency in the enzyme lactase, which is needed to break down the disaccharide lactose into simpler sugars (glucose and galactose).
- Symptoms often include abdominal upset.
- Treatment involves avoiding milk or using lactase enzymes to digest lactose.
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Description
Test your knowledge on enzyme catalysis and the mechanisms involved. This quiz covers key concepts like the induced-fit mechanism, reaction types, and the fate of enzymes after product release. Challenge yourself and deepen your understanding of enzymatic reactions.