AP Biology Flashcards: Environmental Impacts On Enzyme Function

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This deck focuses on Environmental Impacts On Enzyme Function, giving you a quick way to review the definitions, rules, and examples that matter most for AP Biology.

How to use these flashcards

Work through these flashcards in short sessions. Try to answer each prompt before flipping the card, then revisit any cards you miss until the explanation feels automatic.

Flashcard 1: How does temperature affect the rate of enzyme activity?

Answer: Increases until optimal, then decreases. Heat increases motion until denaturation occurs.

Flashcard 2: What is the optimal temperature range for most human enzymes?

Answer: 35°C to 40°C. Body temperature range where enzyme structure remains stable.

Flashcard 3: What is the term for the maximum rate of an enzyme-catalyzed reaction?

Answer: $V_{max}$. Achieved when all enzyme active sites are occupied.

Flashcard 4: What is the result of an enzyme being at its optimal pH?

Answer: Maximum activity. Optimal ionization state for catalytic function.

Flashcard 5: How does extreme pH cause enzyme denaturation?

Answer: It disrupts ionic bonds and hydrogen bonds. Changes in charge distribution destabilize protein structure.

Flashcard 6: Identify the effect of a coenzyme on enzyme function.

Answer: Coenzymes act as carriers for atoms or functional groups. Organic cofactors that transport chemical groups.

Flashcard 7: What is the tertiary structure of an enzyme?

Answer: Three-dimensional folding of a polypeptide. Overall 3D shape crucial for enzyme function.

Flashcard 8: Describe the effect of non-competitive inhibitors on enzymes.

Answer: They reduce activity by altering enzyme shape. Bind elsewhere, changing enzyme conformation.

Flashcard 9: What is the secondary structure of enzymes?

Answer: Alpha helices and beta sheets. Regular folding patterns within protein chains.

Flashcard 10: What is an enzyme's active site?

Answer: The region where substrate molecules bind. Specific shape determines enzyme-substrate interaction.

Flashcard 11: Define the term 'allosteric site' on an enzyme.

Answer: A site other than the active site for regulation. Regulatory binding site separate from catalytic center.

Flashcard 12: What is the inactive form of an enzyme without its cofactor?

Answer: Apoenzyme. Protein component lacking required cofactors for activity.

Flashcard 13: Identify the primary structure of an enzyme.

Answer: Amino acid sequence. Linear order of amino acids in the protein.

Flashcard 14: What role do cofactors play in enzyme activity?

Answer: They assist enzymes in catalysis. Inorganic helpers required for proper enzyme function.

Flashcard 15: What is the effect of increasing enzyme concentration on reaction rate?

Answer: Increases reaction rate until substrate is limited. More enzymes provide more active sites for reactions.

Flashcard 16: What is the term for the maximum rate of an enzyme-catalyzed reaction?

Answer: $V_{max}$. Achieved when all enzyme active sites are occupied.

Flashcard 17: What is the result of an enzyme being at its optimal pH?

Answer: Maximum activity. Optimal ionization state for catalytic function.

Flashcard 18: How does pH affect enzyme activity?

Answer: Enzymes have an optimal pH range where they function best. pH changes affect ionization of active site amino acids.

Flashcard 19: What is the active form of an enzyme called?

Answer: Holoenzyme. Complete enzyme with all necessary cofactors attached.

Flashcard 20: What is the effect of non-competitive inhibition on $V_{max}$?

Answer: Decreases $V_{max}$. Allosteric binding reduces enzyme efficiency.

Flashcard 21: What is feedback inhibition in enzyme activity?

Answer: End product inhibits the pathway. Product accumulation prevents pathway overproduction.

Flashcard 22: How does competitive inhibition affect $K_m$?

Answer: Increases $K_m$. Higher apparent affinity needed due to competition.

Flashcard 23: What is the lock-and-key model of enzyme activity?

Answer: Substrate fits exactly into the active site. Rigid complementary shapes for substrate binding.

Flashcard 24: What is the role of vitamins in enzyme activity?

Answer: Vitamins often serve as coenzymes. Essential nutrients converted to active coenzymes.

Flashcard 25: Define the term 'allosteric site' on an enzyme.

Answer: A site other than the active site for regulation. Regulatory binding site separate from catalytic center.

Flashcard 26: What is an enzyme's active site?

Answer: The region where substrate molecules bind. Specific shape determines enzyme-substrate interaction.

Flashcard 27: What is feedback inhibition in enzyme activity?

Answer: End product inhibits the pathway. Product accumulation prevents pathway overproduction.

Flashcard 28: What is the induced fit model of enzyme activity?

Answer: Active site changes shape to fit the substrate. Dynamic conformational change upon substrate binding.

Flashcard 29: What happens to enzyme activity at temperatures above the optimum?

Answer: Enzyme activity decreases due to denaturation. Heat breaks bonds maintaining enzyme's 3D structure.

Flashcard 30: What is the tertiary structure of an enzyme?

Answer: Three-dimensional folding of a polypeptide. Overall 3D shape crucial for enzyme function.

Flashcard 31: Identify the effect of substrate concentration on enzyme activity.

Answer: Activity increases until the enzyme is saturated. More substrate means more enzyme-substrate collisions.

Flashcard 32: Identify the term for the energy needed to start a reaction.

Answer: Activation energy. Minimum energy barrier for chemical reactions to proceed.

Flashcard 33: Identify the effect of a coenzyme on enzyme function.

Answer: Coenzymes act as carriers for atoms or functional groups. Organic cofactors that transport chemical groups.

Flashcard 34: Identify the term for an enzyme's loss of shape and function.

Answer: Denaturation. Loss of secondary and tertiary structure.

Flashcard 35: What is the lock-and-key model of enzyme activity?

Answer: Substrate fits exactly into the active site. Rigid complementary shapes for substrate binding.

Flashcard 36: What is the effect of a low substrate concentration on enzyme activity?

Answer: Results in a lower reaction rate. Fewer substrate molecules limit enzyme-substrate formation.

Flashcard 37: What is the effect of non-competitive inhibition on $V_{max}$?

Answer: Decreases $V_{max}$. Allosteric binding reduces enzyme efficiency.

Flashcard 38: How does pH affect enzyme activity?

Answer: Enzymes have an optimal pH range where they function best. pH changes affect ionization of active site amino acids.

Flashcard 39: What is the effect of enzyme inhibitors on metabolic pathways?

Answer: They slow or stop the pathway. Block key enzymes, disrupting metabolic flow.

Flashcard 40: What happens to enzyme activity at temperatures above the optimum?

Answer: Enzyme activity decreases due to denaturation. Heat breaks bonds maintaining enzyme's 3D structure.

Flashcard 41: How does extreme pH cause enzyme denaturation?

Answer: It disrupts ionic bonds and hydrogen bonds. Changes in charge distribution destabilize protein structure.

Flashcard 42: What is the effect of low temperatures on enzyme activity?

Answer: Decreases activity by slowing molecular motion. Reduced kinetic energy decreases collision frequency.

Flashcard 43: What is the secondary structure of enzymes?

Answer: Alpha helices and beta sheets. Regular folding patterns within protein chains.

Flashcard 44: What is the effect of a low substrate concentration on enzyme activity?

Answer: Results in a lower reaction rate. Fewer substrate molecules limit enzyme-substrate formation.

Flashcard 45: What is the induced fit model of enzyme activity?

Answer: Active site changes shape to fit the substrate. Dynamic conformational change upon substrate binding.

Flashcard 46: What is the role of an enzyme in a chemical reaction?

Answer: Lowers activation energy. Stabilizes transition state, making reaction easier.

Flashcard 47: What is the active form of an enzyme called?

Answer: Holoenzyme. Complete enzyme with all necessary cofactors attached.

Flashcard 48: Describe the effect of non-competitive inhibitors on enzymes.

Answer: They reduce activity by altering enzyme shape. Bind elsewhere, changing enzyme conformation.

Flashcard 49: What is the effect of enzyme inhibitors on metabolic pathways?

Answer: They slow or stop the pathway. Block key enzymes, disrupting metabolic flow.

Flashcard 50: What effect does salinity have on enzyme activity?

Answer: High salinity can denature enzymes. Disrupts water balance and protein stability.

Flashcard 51: How do enzymes increase the speed of reactions?

Answer: By lowering the activation energy. Stabilize transition states to accelerate reactions.

Flashcard 52: What is the result of enzyme saturation?

Answer: Maximum reaction rate is reached. All active sites occupied, no further rate increase.

Flashcard 53: What is the optimal temperature range for most human enzymes?

Answer: 35°C to 40°C. Body temperature range where enzyme structure remains stable.

Flashcard 54: How does competitive inhibition affect $K_m$?

Answer: Increases $K_m$. Higher apparent affinity needed due to competition.

Flashcard 55: How does temperature affect the rate of enzyme activity?

Answer: Increases until optimal, then decreases. Heat increases motion until denaturation occurs.

Flashcard 56: What is the effect of increasing enzyme concentration on reaction rate?

Answer: Increases reaction rate until substrate is limited. More enzymes provide more active sites for reactions.

Flashcard 57: Identify the term for an enzyme's loss of shape and function.

Answer: Denaturation. Loss of secondary and tertiary structure.

Flashcard 58: What is the quaternary structure of enzymes?

Answer: Multiple polypeptide chains forming a protein. Complex proteins with multiple subunits working together.

Flashcard 59: What is the role of an enzyme in a chemical reaction?

Answer: Lowers activation energy. Stabilizes transition state, making reaction easier.

Flashcard 60: What role do cofactors play in enzyme activity?

Answer: They assist enzymes in catalysis. Inorganic helpers required for proper enzyme function.

Flashcard 61: Identify the term for the energy needed to start a reaction.

Answer: Activation energy. Minimum energy barrier for chemical reactions to proceed.

Flashcard 62: Identify the impact of heavy metals on enzyme activity.

Answer: They can inhibit activity by binding to the enzyme. Metals disrupt protein structure and active sites.

Flashcard 63: What is the effect of a mutation on enzyme function?

Answer: Can alter enzyme structure and activity. Changes amino acid sequence, potentially affecting structure.

Flashcard 64: What is the inactive form of an enzyme without its cofactor?

Answer: Apoenzyme. Protein component lacking required cofactors for activity.

Flashcard 65: What is the effect of a mutation on enzyme function?

Answer: Can alter enzyme structure and activity. Changes amino acid sequence, potentially affecting structure.

Flashcard 66: Identify the effect of enzyme concentration on $V_{max}$.

Answer: Increases $V_{max}$. More enzymes allow higher maximum reaction rates.

Flashcard 67: What is the role of vitamins in enzyme activity?

Answer: Vitamins often serve as coenzymes. Essential nutrients converted to active coenzymes.

Flashcard 68: How do enzymes increase the speed of reactions?

Answer: By lowering the activation energy. Stabilize transition states to accelerate reactions.

Flashcard 69: What is enzyme specificity?

Answer: Enzymes catalyze specific reactions. Shape complementarity determines which substrates bind.

Flashcard 70: What is the quaternary structure of enzymes?

Answer: Multiple polypeptide chains forming a protein. Complex proteins with multiple subunits working together.

Flashcard 71: What is the effect of low temperatures on enzyme activity?

Answer: Decreases activity by slowing molecular motion. Reduced kinetic energy decreases collision frequency.

Flashcard 72: Identify the effect of enzyme concentration on $V_{max}$.

Answer: Increases $V_{max}$. More enzymes allow higher maximum reaction rates.

Flashcard 73: Identify the impact of heavy metals on enzyme activity.

Answer: They can inhibit activity by binding to the enzyme. Metals disrupt protein structure and active sites.

Flashcard 74: Identify the primary structure of an enzyme.

Answer: Amino acid sequence. Linear order of amino acids in the protein.

Flashcard 75: What effect does salinity have on enzyme activity?

Answer: High salinity can denature enzymes. Disrupts water balance and protein stability.

Flashcard 76: Identify the effect of substrate concentration on enzyme activity.

Answer: Activity increases until the enzyme is saturated. More substrate means more enzyme-substrate collisions.

Flashcard 77: What is the result of enzyme saturation?

Answer: Maximum reaction rate is reached. All active sites occupied, no further rate increase.

Flashcard 78: What is enzyme specificity?

Answer: Enzymes catalyze specific reactions. Shape complementarity determines which substrates bind.