Energy From Food - Middle School Life Science
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What is the main process cells use to release usable energy from food molecules?
What is the main process cells use to release usable energy from food molecules?
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Cellular respiration. Breaks down glucose to release energy stored in chemical bonds.
Cellular respiration. Breaks down glucose to release energy stored in chemical bonds.
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What is the primary usable energy molecule that cells make from food energy?
What is the primary usable energy molecule that cells make from food energy?
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ATP (adenosine triphosphate). Energy currency of cells, produced when food molecules break down.
ATP (adenosine triphosphate). Energy currency of cells, produced when food molecules break down.
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What is the overall chemical equation for aerobic cellular respiration?
What is the overall chemical equation for aerobic cellular respiration?
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$C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O + \text{ATP (energy)}$. Shows glucose and oxygen react to form carbon dioxide, water, and energy.
$C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O + \text{ATP (energy)}$. Shows glucose and oxygen react to form carbon dioxide, water, and energy.
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Which reactant in aerobic respiration is the usual source of carbon atoms in $CO_2$?
Which reactant in aerobic respiration is the usual source of carbon atoms in $CO_2$?
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Glucose ($C_6H_{12}O_6$). Its six carbon atoms are released as $CO_2$ during respiration.
Glucose ($C_6H_{12}O_6$). Its six carbon atoms are released as $CO_2$ during respiration.
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Which reactant in aerobic respiration is required to allow the highest ATP yield?
Which reactant in aerobic respiration is required to allow the highest ATP yield?
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Oxygen ($O_2$). Acts as final electron acceptor, enabling maximum ATP production.
Oxygen ($O_2$). Acts as final electron acceptor, enabling maximum ATP production.
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What are the two main products (besides ATP) made during aerobic cellular respiration?
What are the two main products (besides ATP) made during aerobic cellular respiration?
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$CO_2$ and $H_2O$. Waste products formed when glucose is completely oxidized.
$CO_2$ and $H_2O$. Waste products formed when glucose is completely oxidized.
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In which organelle do most steps of aerobic respiration occur in eukaryotic cells?
In which organelle do most steps of aerobic respiration occur in eukaryotic cells?
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Mitochondria. Contains enzymes for Krebs cycle and electron transport chain.
Mitochondria. Contains enzymes for Krebs cycle and electron transport chain.
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What is the role of enzymes in a model of energy release from food reactions?
What is the role of enzymes in a model of energy release from food reactions?
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They lower activation energy. Catalysts that speed reactions by reducing energy barriers.
They lower activation energy. Catalysts that speed reactions by reducing energy barriers.
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What is the key difference between cellular respiration and photosynthesis in energy flow?
What is the key difference between cellular respiration and photosynthesis in energy flow?
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Respiration releases energy; photosynthesis stores energy. Opposite processes in energy flow through living systems.
Respiration releases energy; photosynthesis stores energy. Opposite processes in energy flow through living systems.
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Which process is most directly modeled as converting food energy into ATP for cell work?
Which process is most directly modeled as converting food energy into ATP for cell work?
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Cellular respiration converting glucose energy to ATP. Main pathway for extracting usable energy from nutrients.
Cellular respiration converting glucose energy to ATP. Main pathway for extracting usable energy from nutrients.
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Which option best completes the model: glucose + oxygen → _____ + water + ATP?
Which option best completes the model: glucose + oxygen → _____ + water + ATP?
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Carbon dioxide ($CO_2$). Glucose carbons are oxidized to $CO_2$ in respiration.
Carbon dioxide ($CO_2$). Glucose carbons are oxidized to $CO_2$ in respiration.
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Find the missing coefficient to balance oxygen: $C_6H_{12}O_6 + _O_2 \rightarrow 6CO_2 + 6H_2O$.
Find the missing coefficient to balance oxygen: $C_6H_{12}O_6 + _O_2 \rightarrow 6CO_2 + 6H_2O$.
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$6$. Balances equation: 1 glucose needs 6 oxygen molecules.
$6$. Balances equation: 1 glucose needs 6 oxygen molecules.
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Which option best describes oxygen’s role in aerobic respiration models: fuel, catalyst, or reactant?
Which option best describes oxygen’s role in aerobic respiration models: fuel, catalyst, or reactant?
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Reactant. Consumed in the reaction, not just a helper molecule.
Reactant. Consumed in the reaction, not just a helper molecule.
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Which cell organelle is commonly modeled as the main site of aerobic respiration?
Which cell organelle is commonly modeled as the main site of aerobic respiration?
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Mitochondrion. Often called the powerhouse of the cell for its ATP production.
Mitochondrion. Often called the powerhouse of the cell for its ATP production.
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Which products are released as waste during aerobic cellular respiration?
Which products are released as waste during aerobic cellular respiration?
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Carbon dioxide ($CO_2$) and water ($H_2O$). These byproducts are exhaled and excreted after energy extraction.
Carbon dioxide ($CO_2$) and water ($H_2O$). These byproducts are exhaled and excreted after energy extraction.
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What is the main purpose of cellular respiration in cells?
What is the main purpose of cellular respiration in cells?
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To convert food energy into ATP for cell work. Cells break down glucose to produce ATP, their energy currency.
To convert food energy into ATP for cell work. Cells break down glucose to produce ATP, their energy currency.
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What molecule is the immediate, usable energy source for most cell processes?
What molecule is the immediate, usable energy source for most cell processes?
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ATP. Adenosine triphosphate powers cellular activities like movement and synthesis.
ATP. Adenosine triphosphate powers cellular activities like movement and synthesis.
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What is the overall balanced equation for aerobic cellular respiration?
What is the overall balanced equation for aerobic cellular respiration?
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$C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O +$ ATP. Glucose and oxygen react to form carbon dioxide, water, and energy.
$C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O +$ ATP. Glucose and oxygen react to form carbon dioxide, water, and energy.
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Which reactant must be present for aerobic cellular respiration to occur?
Which reactant must be present for aerobic cellular respiration to occur?
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Oxygen ($O_2$). Acts as the final electron acceptor in the electron transport chain.
Oxygen ($O_2$). Acts as the final electron acceptor in the electron transport chain.
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Identify the correct pairing in a respiration model: glucose and oxygen are what?
Identify the correct pairing in a respiration model: glucose and oxygen are what?
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Reactants. They are the starting materials that undergo chemical change.
Reactants. They are the starting materials that undergo chemical change.
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Identify the correct pairing in a respiration model: carbon dioxide and water are what?
Identify the correct pairing in a respiration model: carbon dioxide and water are what?
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Products. They are the substances formed after the chemical reaction.
Products. They are the substances formed after the chemical reaction.
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Which arrow direction correctly completes this model: $C_6H_{12}O_6 + 6O_2$ ___ $6CO_2 + 6H_2O$?
Which arrow direction correctly completes this model: $C_6H_{12}O_6 + 6O_2$ ___ $6CO_2 + 6H_2O$?
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$\rightarrow$. Shows the direction from reactants to products in the reaction.
$\rightarrow$. Shows the direction from reactants to products in the reaction.
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What coefficient completes the balanced respiration model: $C_6H_{12}O_6 + _O_2 \rightarrow 6CO_2 + 6H_2O$?
What coefficient completes the balanced respiration model: $C_6H_{12}O_6 + _O_2 \rightarrow 6CO_2 + 6H_2O$?
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$6$. Balances oxygen atoms: 6 $O_2$ molecules provide 12 oxygen atoms.
$6$. Balances oxygen atoms: 6 $O_2$ molecules provide 12 oxygen atoms.
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What coefficient completes the balanced respiration model: $C_6H_{12}O_6 + 6O_2 \rightarrow _CO_2 + 6H_2O$?
What coefficient completes the balanced respiration model: $C_6H_{12}O_6 + 6O_2 \rightarrow _CO_2 + 6H_2O$?
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$6$. Balances carbon atoms: glucose has 6 carbons, forming 6 $CO_2$.
$6$. Balances carbon atoms: glucose has 6 carbons, forming 6 $CO_2$.
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What coefficient completes the balanced respiration model: $C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + _H_2O$?
What coefficient completes the balanced respiration model: $C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + _H_2O$?
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$6$. Balances hydrogen atoms: glucose has 12 H, forming 6 $H_2O$.
$6$. Balances hydrogen atoms: glucose has 12 H, forming 6 $H_2O$.
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