Step-by-Step Guidance for Photosynthesis and Cellular Respiration Study Questions

Study Guide - Smart Notes

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Q1. Draw the structure of glucose and explain why it stores a large amount of energy.

Background

Topic: Carbohydrate Structure and Bioenergetics

This question tests your understanding of glucose's molecular structure and why it is an effective energy storage molecule in biological systems.

Key Terms and Concepts:

Glucose: A six-carbon monosaccharide (C6H12O6).
Covalent Bonds: The bonds between atoms in glucose store chemical energy.
Energy Storage: Energy is stored in the C-H and C-C bonds of glucose.

Step-by-Step Guidance

Draw the linear or ring structure of glucose, showing all six carbons, hydrogens, and oxygens. (You can use a Haworth projection for the ring form or Fischer projection for the linear form.)
Label the functional groups (hydroxyl groups and the aldehyde group in the linear form).
Consider where the energy is stored: Focus on the C-H and C-C bonds, which are high-energy covalent bonds.
Think about why breaking these bonds during cellular respiration releases energy that cells can use to make ATP.

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Q2. Identify aerobic cellular respiration as endergonic or exergonic and if endergonic, identify the source of energy for this process.

Background

Topic: Bioenergetics

This question is about classifying the overall energy change in aerobic cellular respiration and understanding energy sources in metabolic reactions.

Key Terms:

Exergonic: A reaction that releases energy (ΔG < 0).
Endergonic: A reaction that requires energy input (ΔG > 0).
Source of Energy: If endergonic, what provides the energy?

Step-by-Step Guidance

Recall the definition of exergonic and endergonic reactions in terms of free energy change (ΔG).
Think about whether aerobic respiration releases or requires energy overall.
If you determine it is endergonic, identify what energy source drives the process (e.g., ATP, sunlight, glucose, etc.).

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Q3. Write the overall equation of aerobic cellular respiration, identify the reactants that are oxidized versus reduced, and identify the molecule that carries electrons between reactants.

Background

Topic: Cellular Respiration Redox Reactions

This question tests your ability to write the summary equation for aerobic respiration, recognize oxidation and reduction, and identify electron carriers.

Key Terms and Formulas:

Overall equation:
Oxidation: Loss of electrons
Reduction: Gain of electrons
Electron Carrier: Molecules like NAD+ and FAD

Step-by-Step Guidance

Write the balanced equation for aerobic cellular respiration.
Identify which reactant is losing electrons (being oxidized) and which is gaining electrons (being reduced).
Determine which molecule acts as the main electron carrier between the reactants and products.

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Q4. Draw a mitochondrion and identify the stroma and intermembrane space.

Background

Topic: Mitochondrial Structure

This question is about recognizing and labeling the key compartments of the mitochondrion.

Key Terms:

Mitochondrion: Organelle where cellular respiration occurs.
Matrix: The innermost compartment (note: "stroma" is found in chloroplasts, not mitochondria).
Intermembrane Space: The space between the inner and outer mitochondrial membranes.

Step-by-Step Guidance

Draw an oval to represent the mitochondrion, showing both the outer and inner membranes.
Label the intermembrane space (between the two membranes).
Label the matrix (not stroma; stroma is in chloroplasts).
Double-check the terminology to avoid confusion between mitochondria and chloroplasts.

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Q5. List the stages of aerobic cellular respiration in order, the location of each stage, and identify the major ATP producing phase.

Background

Topic: Cellular Respiration Pathway

This question tests your knowledge of the sequence, location, and ATP yield of the stages of aerobic respiration.

Key Terms:

Glycolysis
Pyruvate Processing
Citric Acid Cycle (Krebs Cycle)
Oxidative Phosphorylation (Electron Transport Chain and Chemiosmosis)

Step-by-Step Guidance

List the four main stages of aerobic cellular respiration in the correct order.
For each stage, specify where in the cell it occurs (cytoplasm, mitochondrial matrix, inner mitochondrial membrane, etc.).
Identify which stage produces the most ATP.

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Q6. Identify the reactants and the 3 products of glycolysis. Describe why the three products are high energy.

Background

Topic: Glycolysis

This question is about the inputs and outputs of glycolysis and the energetic significance of its products.

Key Terms:

Glycolysis: The breakdown of glucose to pyruvate.
ATP, NADH, Pyruvate: Main products of glycolysis.

Step-by-Step Guidance

Identify the main reactant (substrate) that enters glycolysis.
List the three main products generated by glycolysis.
Explain why each product is considered "high energy" (think about their roles in metabolism and ATP production).

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Q7. Identify the reactants and 3 products of pyruvate processing. Identify which product is low energy.

Background

Topic: Pyruvate Oxidation

This question focuses on the conversion of pyruvate to acetyl-CoA and the energy content of the products.

Key Terms:

Pyruvate Processing: The step linking glycolysis and the citric acid cycle.
Acetyl-CoA, NADH, CO2: Main products.

Step-by-Step Guidance

Identify the main reactant entering pyruvate processing.
List the three products formed.
Determine which product is considered low energy and explain why (think about waste products).

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Q8. Identify the products of the Citric Acid Cycle and explain why this step is considered the “major oxidation step.”

Background

Topic: Citric Acid Cycle (Krebs Cycle)

This question is about the outputs of the citric acid cycle and its role in oxidation during cellular respiration.

Key Terms:

Citric Acid Cycle: Series of reactions that completes the oxidation of glucose derivatives.
NADH, FADH2, ATP (or GTP), CO2: Main products.
Oxidation: Loss of electrons, usually to NAD+ or FAD.

Step-by-Step Guidance

List the main products generated per turn of the citric acid cycle.
Explain how the cycle results in the oxidation of acetyl groups (removal of electrons).
Describe why this step is considered the "major oxidation step" in cellular respiration.

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Q9. Identify the source of energy for the active transport of protons.

Background

Topic: Electron Transport Chain and Chemiosmosis

This question is about what drives the movement of protons (H+) across the mitochondrial membrane during oxidative phosphorylation.

Key Terms:

Active Transport: Movement of ions against their concentration gradient, requiring energy.
Electron Transport Chain: Series of protein complexes in the inner mitochondrial membrane.

Step-by-Step Guidance

Recall what provides the energy for proton pumps in the electron transport chain.
Think about the role of electrons from NADH and FADH2 in this process.
Connect the flow of electrons to the movement of protons across the membrane.

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Q10. Identify the source of potential energy and enzyme that drives ATP synthesis in oxidative phosphorylation.

Background

Topic: Chemiosmosis and ATP Synthase

This question is about the proton gradient and the enzyme responsible for ATP production during oxidative phosphorylation.

Key Terms:

Proton Motive Force: The electrochemical gradient of H+ across the inner mitochondrial membrane.
ATP Synthase: The enzyme that synthesizes ATP from ADP and inorganic phosphate.

Step-by-Step Guidance

Identify what creates the potential energy used to make ATP (think about the proton gradient).
Name the enzyme that uses this potential energy to catalyze ATP formation.
Briefly describe how the flow of protons through this enzyme leads to ATP synthesis.