Cellular Respiration & Photosynthesis Study Guide – Step-by-Step Guidance

Q1. Define the following terms:

• slow-twitch muscle fibers

• fast-twitch muscle fibers

• aerobic

• anaerobic

• photosynthesis

• autotroph

• producer

• heterotroph

• consumer

• cellular respiration

• redox reaction

• oxidation

• reduction

• NADH

• FADH2

• electron transport chain

• glycolysis

• citric acid cycle

• ATP synthase

• oxidative phosphorylation

• fermentation

• lactic acid

• ethyl alcohol

• metabolism

• metabolic pathway

• glucose

• pyruvic acid

• acetic acid

• Coenzyme A

• Acetyl Coenzyme A

• diabetes

• insulin

Background

Topic: Cellular Respiration, Photosynthesis, and Metabolism

This question is testing your understanding of key vocabulary and concepts related to energy transformation in cells, including the processes of cellular respiration and photosynthesis, as well as the molecules and pathways involved.

Key Terms and Concepts:

• Many of these terms are foundational for understanding how cells obtain and use energy. For example, 'aerobic' means requiring oxygen, while 'anaerobic' means not requiring oxygen. 'Photosynthesis' is the process by which plants convert light energy into chemical energy, and 'cellular respiration' is how cells extract energy from food molecules.

• Redox reactions (oxidation-reduction) are central to energy transfer in cells. 'NADH' and 'FADH2' are electron carriers involved in these reactions.

• Metabolic pathways are series of chemical reactions in a cell, and terms like 'glycolysis', 'citric acid cycle', and 'electron transport chain' refer to specific stages in cellular respiration.

Step-by-Step Guidance

1. Start by grouping the terms into categories (e.g., processes, molecules, cell structures, types of organisms).

2. For each term, write a concise definition in your own words. Use your textbook or class notes for reference.

3. For molecules like NADH or FADH2, specify their role in cellular respiration (e.g., electron carriers).

4. For processes (e.g., glycolysis, fermentation), briefly state what happens and where in the cell it occurs.

5. For terms like 'diabetes' and 'insulin', relate them to metabolism and glucose regulation.

Try defining each term before checking your answers!

Q2. List the reactants and products in photosynthesis. Identify the main purpose for photosynthesis. What is the primary product? What is the waste product or by-product of photosynthesis?

Background

Topic: Photosynthesis

This question tests your knowledge of the overall chemical equation for photosynthesis, the main goal of the process, and the distinction between the main product and by-products.

Key Formula:

The general equation for photosynthesis is:

$6\ \mathrm{CO}_2 + 6\ \mathrm{H}_2\mathrm{O} + \text{light energy} \rightarrow \mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6 + 6\ \mathrm{O}_2$

Step-by-Step Guidance

1. Identify the reactants (inputs) in the equation above.

2. Identify the products (outputs) in the equation above.

3. Determine which product is the main purpose of photosynthesis (i.e., what the plant "wants" to make).

4. Identify which product is considered a waste or by-product.

5. >

Try to write out the equation and label each part before checking your answer!

Q3. List the reactants and products in aerobic cellular respiration.

Background

Topic: Cellular Respiration

This question is about the overall chemical equation for aerobic cellular respiration, which is essentially the reverse of photosynthesis.

Key Formula:

The general equation for aerobic cellular respiration is:

$\mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6 + 6\ \mathrm{O}_2 \rightarrow 6\ \mathrm{CO}_2 + 6\ \mathrm{H}_2\mathrm{O} + \text{energy (ATP)}$

Step-by-Step Guidance

1. Identify the reactants (inputs) in the equation above.

2. Identify the products (outputs) in the equation above.

3. Note that energy is released in the form of ATP.

Try to write out the equation and label each part before checking your answer!

Q4. Explain how photosynthesis and cellular respiration are related.

Background

Topic: Relationship between Photosynthesis and Cellular Respiration

This question tests your understanding of how these two processes are interconnected in the flow of energy and matter in ecosystems.

Step-by-Step Guidance

1. Write out the equations for both photosynthesis and cellular respiration.

2. Compare the reactants and products of each process.

3. Explain how the products of one process serve as the reactants for the other.

4. Discuss the flow of energy (from sunlight to chemical energy to ATP).

Try to explain the relationship in your own words before checking your answer!

Q5. Identify which types of organisms perform both photosynthesis and respiration and which types perform only cellular respiration.

Background

Topic: Types of Organisms and Metabolic Pathways

This question is about distinguishing between autotrophs (like plants) and heterotrophs (like animals), and understanding which metabolic processes they perform.

Step-by-Step Guidance

1. Recall the definitions of autotroph, producer, heterotroph, and consumer.

2. List examples of organisms that perform both photosynthesis and respiration.

3. List examples of organisms that perform only cellular respiration.

Try to categorize organisms before checking your answer!

Q6. Explain how breathing is related to cellular respiration.

Background

Topic: Gas Exchange and Cellular Respiration

This question tests your understanding of how the physical act of breathing supplies oxygen for cellular respiration and removes carbon dioxide produced by cells.

Step-by-Step Guidance

1. Define breathing (ventilation) and cellular respiration.

2. Explain how oxygen from the air is transported to cells.

3. Describe how carbon dioxide produced by cells is removed from the body.

Try to connect the processes before checking your answer!

Q7. Predict approximately how many molecules of ATP are produced for every one molecule of glucose that undergoes aerobic cellular respiration.

Background

Topic: ATP Yield from Cellular Respiration

This question is about the efficiency of aerobic respiration and the total ATP produced from one glucose molecule.

Key Concept:

• ATP is produced during glycolysis, the citric acid cycle, and oxidative phosphorylation.

Step-by-Step Guidance

1. Recall the three main stages of cellular respiration: glycolysis, citric acid cycle, and electron transport chain/oxidative phosphorylation.

2. Estimate the number of ATP molecules produced at each stage.

3. Add up the ATP produced from all stages to get the total per glucose molecule.

Try to calculate the total ATP before checking your answer!

Q8. Identify which molecules are undergoing oxidation and which are undergoing reduction during the three stages of cellular respiration.

Background

Topic: Redox Reactions in Cellular Respiration

This question tests your understanding of electron transfer (oxidation and reduction) during glycolysis, the citric acid cycle, and the electron transport chain.

Key Terms:

• Oxidation: loss of electrons

• Reduction: gain of electrons

Step-by-Step Guidance

1. For each stage (glycolysis, citric acid cycle, electron transport chain), identify the main molecules involved in electron transfer.

2. Determine which molecules are losing electrons (being oxidized) and which are gaining electrons (being reduced).

3. Pay special attention to NAD+/NADH and FAD/FADH2.

Try to match oxidation and reduction events before checking your answer!

Q9. Explain why oxygen is described as an "electron grabber".

Background

Topic: Role of Oxygen in Cellular Respiration

This question is about oxygen's high electronegativity and its role as the final electron acceptor in the electron transport chain.

Step-by-Step Guidance

1. Define electronegativity and explain why oxygen is highly electronegative.

2. Describe what happens to electrons at the end of the electron transport chain.

3. Explain why oxygen is essential for the process to continue.

Try to explain in your own words before checking your answer!

Q10. Explain what we mean when we say electrons are "falling". How are they "falling"? What important event occurs concurrently as electrons "fall"?

Background

Topic: Electron Transport Chain and Energy Release

This question is about the transfer of electrons through the electron transport chain and how this process is coupled to ATP synthesis.

Step-by-Step Guidance

1. Describe the movement of electrons from high to low energy states in the electron transport chain.

2. Explain how this "fall" releases energy.

3. Discuss how the released energy is used by the cell (e.g., to pump protons and generate ATP).

Try to describe the process before checking your answer!