BIO 1111 Exam 3 Review – Step-by-Step Study Guidance

Q1. Discuss various forms of energy that we can get energy from or convert energy from.

Background

Topic: Forms of Energy in Biology

This question tests your understanding of the different types of energy relevant to biological systems and how energy can be transformed from one form to another.

Key Terms:

• Kinetic Energy: Energy of motion.

• Potential Energy: Stored energy due to position or structure (e.g., chemical bonds).

• Chemical Energy: Energy stored in chemical bonds (e.g., glucose, ATP).

• Light Energy: Energy from sunlight, used in photosynthesis.

• Thermal Energy: Energy associated with heat.

Step-by-Step Guidance

1. List the main forms of energy relevant to living organisms (e.g., chemical, light, kinetic, potential, thermal).

2. Describe how organisms obtain energy from these sources (e.g., plants use light energy, animals use chemical energy from food).

3. Explain how energy can be converted from one form to another in biological processes (e.g., photosynthesis converts light energy to chemical energy).

4. Give examples of energy conversions in cells (e.g., cellular respiration converts chemical energy in glucose to ATP).

Try solving on your own before revealing the answer!

Q2. Discuss the 2 Laws of Thermodynamics and how they play a role in enzymes.

Background

Topic: Thermodynamics in Biology

This question tests your understanding of the First and Second Laws of Thermodynamics and their relevance to enzyme function and metabolism.

Key Terms and Concepts:

• First Law of Thermodynamics: Energy cannot be created or destroyed, only transformed.

• Second Law of Thermodynamics: Every energy transfer increases the entropy (disorder) of the universe.

• Enzymes: Biological catalysts that speed up chemical reactions by lowering activation energy.

Step-by-Step Guidance

1. State the First Law of Thermodynamics and relate it to energy flow in cells.

2. State the Second Law of Thermodynamics and discuss its implications for biological systems.

3. Explain how enzymes affect the energy transformations in cells (e.g., by lowering activation energy).

4. Discuss how enzymes help manage entropy and energy efficiency in metabolic pathways.

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Q3. Compare and Contrast Endergonic vs. Exergonic Reactions.

Background

Topic: Energy Changes in Chemical Reactions

This question tests your ability to distinguish between reactions that require energy input and those that release energy.

Key Terms and Formulas:

• Endergonic Reaction: Absorbs free energy; non-spontaneous.

• Exergonic Reaction: Releases free energy; spontaneous.

• Gibbs Free Energy ($\Delta G$): $\Delta G = \Delta H - T\Delta S$

Step-by-Step Guidance

1. Define endergonic and exergonic reactions in terms of energy change ($\Delta G$).

2. Explain the sign of $\Delta G$ for each type of reaction.

3. Give examples of each type (e.g., photosynthesis is endergonic, cellular respiration is exergonic).

4. Discuss the biological significance of coupling these reactions in metabolism.

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Q4. Explain how enzymes work.

Background

Topic: Enzyme Structure and Function

This question tests your understanding of the mechanism by which enzymes catalyze biochemical reactions.

Key Terms:

• Active Site: Region on the enzyme where the substrate binds.

• Substrate: The reactant that an enzyme acts on.

• Activation Energy ($E_a$): The energy required to start a reaction.

Step-by-Step Guidance

1. Describe the structure of an enzyme and the concept of the active site.

2. Explain how the substrate binds to the active site (induced fit model).

3. Discuss how enzymes lower the activation energy ($E_a$) of reactions.

4. Outline the steps of the enzyme-substrate complex formation and product release.

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Q5. Explain 2 ways Inhibitors work on enzymes.

Background

Topic: Enzyme Regulation

This question tests your understanding of how enzyme activity can be regulated by inhibitors.

Key Terms:

• Competitive Inhibitor: Binds to the active site, blocking substrate binding.

• Noncompetitive Inhibitor: Binds to a different site, changing enzyme shape and function.

Step-by-Step Guidance

1. Define competitive inhibition and describe how it affects enzyme activity.

2. Define noncompetitive inhibition and explain its effect on enzyme function.

3. Compare the two types of inhibition in terms of their binding sites and effects on $V_{max}$ and $K_m$.

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Q6. Compare and Contrast Negative and Positive Feedback.

Background

Topic: Feedback Regulation in Metabolism

This question tests your understanding of how biological systems regulate metabolic pathways using feedback mechanisms.

Key Terms:

• Negative Feedback: End product inhibits the pathway, maintaining homeostasis.

• Positive Feedback: End product enhances the pathway, amplifying the response.

Step-by-Step Guidance

1. Define negative feedback and provide a biological example.

2. Define positive feedback and provide a biological example.

3. Compare the effects of each on pathway regulation and stability.

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Q7. Explain how and where the body stores excess Calories.

Background

Topic: Energy Storage in the Body

This question tests your understanding of how the body manages excess energy intake.

Key Terms:

• Glycogen: Storage form of glucose in liver and muscles.

• Adipose Tissue: Stores energy as fat (triglycerides).

Step-by-Step Guidance

1. Describe how excess glucose is stored as glycogen in the liver and muscles.

2. Explain how excess energy is converted to fat and stored in adipose tissue.

3. Discuss the relative capacity of glycogen vs. fat storage in the body.

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Q8. Explain what ATP does.

Background

Topic: ATP Function in Cells

This question tests your understanding of the role of ATP as the energy currency of the cell.

Key Terms:

• ATP (Adenosine Triphosphate): Main energy carrier in cells.

• Phosphorylation: Transfer of a phosphate group to another molecule.

Step-by-Step Guidance

1. Describe the structure of ATP and its high-energy phosphate bonds.

2. Explain how ATP hydrolysis releases energy for cellular work.

3. Discuss how ATP is regenerated from ADP and inorganic phosphate.

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Q9. Write out the chemical equation for respiration.

Background

Topic: Cellular Respiration

This question tests your ability to recall the overall balanced equation for aerobic cellular respiration.

Key Formula:

• General equation: $C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O + \text{energy (ATP)}$

Step-by-Step Guidance

1. Identify the reactants (glucose and oxygen) and products (carbon dioxide, water, ATP).

2. Write the balanced chemical equation for aerobic respiration.

3. Note the stoichiometry (number of molecules of each reactant and product).

Try solving on your own before revealing the answer!

Q10. What is the initial energy source for respiration?

Background

Topic: Cellular Respiration – Energy Sources

This question tests your understanding of where the energy for cellular respiration originates.

Key Terms:

• Glucose: Primary energy source for most cells.

• Organic Molecules: Other molecules (e.g., fats, proteins) can also be used.

Step-by-Step Guidance

1. Identify the main molecule that enters the respiration pathway (usually glucose).

2. Explain how this molecule is broken down to release energy.

3. Mention alternative energy sources if glucose is not available.

Try solving on your own before revealing the answer!

Q11. What molecules are used for respiration?

Background

Topic: Inputs of Cellular Respiration

This question tests your knowledge of the reactants required for cellular respiration.

Key Terms:

• Glucose: Main fuel molecule.

• Oxygen: Final electron acceptor in aerobic respiration.

Step-by-Step Guidance

1. List the main reactants needed for aerobic respiration.

2. Explain the role of each molecule in the process.

Try solving on your own before revealing the answer!

Q12. What molecules are produced by respiration?

Background

Topic: Outputs of Cellular Respiration

This question tests your knowledge of the products generated by cellular respiration.

Key Terms:

• Carbon Dioxide ($CO_2$): Waste product exhaled by organisms.

• Water ($H_2O$): Produced during electron transport chain.

• ATP: Usable energy for the cell.

Step-by-Step Guidance

1. List the main products of aerobic respiration.

2. Explain the fate of each product in the cell or organism.

Try solving on your own before revealing the answer!

Q13. Explain the 3 steps of respiration and where they occur.

Background

Topic: Stages of Cellular Respiration

This question tests your understanding of the sequence and location of the main stages of cellular respiration.

Key Terms:

• Glycolysis: Occurs in the cytoplasm.

• Krebs Cycle (Citric Acid Cycle): Occurs in the mitochondrial matrix.

• Electron Transport Chain: Occurs in the inner mitochondrial membrane.

Step-by-Step Guidance

1. Name the three main stages of cellular respiration.

2. Describe the location of each stage within the cell.

3. Briefly summarize the main events of each stage.

Try solving on your own before revealing the answer!

Q14. Label the Parts of the Mitochondria and identify which stages of respiration occur there.

Background

Topic: Mitochondrial Structure and Function

This question tests your ability to identify mitochondrial structures and relate them to cellular respiration stages.

Key Terms:

• Matrix: Site of Krebs Cycle.

• Inner Membrane: Site of Electron Transport Chain.

• Intermembrane Space: Involved in proton gradient formation.

Step-by-Step Guidance

1. Label the main parts of the mitochondrion (outer membrane, inner membrane, matrix, intermembrane space).

2. Identify which stage of respiration occurs in each part.

3. Explain the significance of compartmentalization for respiration efficiency.

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Q15. Compare and contrast Aerobic Respiration vs Anaerobic Fermentation.

Background

Topic: Types of Cellular Respiration

This question tests your understanding of the differences between respiration with and without oxygen.

Key Terms:

• Aerobic Respiration: Uses oxygen, produces more ATP.

• Anaerobic Fermentation: Does not use oxygen, produces less ATP.

Step-by-Step Guidance

1. Define aerobic respiration and anaerobic fermentation.

2. Compare ATP yield, end products, and efficiency.

3. Discuss the conditions under which each process occurs.

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Q16. Compare and contrast anaerobic fermentation between plants and animals.

Background

Topic: Fermentation Pathways

This question tests your understanding of the differences in fermentation products between plant and animal cells.

Key Terms:

• Lactic Acid Fermentation: Occurs in animals, produces lactic acid.

• Alcoholic Fermentation: Occurs in plants/yeast, produces ethanol and $CO_2$.

Step-by-Step Guidance

1. Describe the fermentation pathway in animal cells (lactic acid fermentation).

2. Describe the fermentation pathway in plant cells (alcoholic fermentation).

3. Compare the end products and significance of each pathway.

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Q17. Explain photons of light and what makes visible light seen by us.

Background

Topic: Light and Vision

This question tests your understanding of the nature of light and how humans perceive visible wavelengths.

Key Terms:

• Photon: A particle of light energy.

• Visible Spectrum: Range of wavelengths visible to the human eye (about 400–700 nm).

Step-by-Step Guidance

1. Define a photon and its role in light energy.

2. Explain what determines the color and visibility of light to humans.

3. Discuss how the eye detects different wavelengths as colors.

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Q18. Explain the relationship between wavelength and energy.

Background

Topic: Properties of Light

This question tests your understanding of how the energy of light relates to its wavelength.

Key Formula:

• $E = \frac{hc}{\lambda}$

• Where $E$ = energy, $h$ = Planck's constant, $c$ = speed of light, $\lambda$ = wavelength.

Step-by-Step Guidance

1. State the inverse relationship between wavelength and energy.

2. Write the formula relating energy and wavelength.

3. Explain what happens to energy as wavelength increases or decreases.

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Q19. Explain the various pigments in plants.

Background

Topic: Plant Pigments

This question tests your understanding of the different pigments involved in photosynthesis and their roles.

Key Terms:

• Chlorophyll a: Main pigment in photosynthesis.

• Chlorophyll b: Accessory pigment.

• Carotenoids: Accessory pigments that absorb different wavelengths.

Step-by-Step Guidance

1. List the main pigments found in plants.

2. Describe the role of each pigment in capturing light energy.

3. Explain why plants appear green.

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Q20. Write out the chemical equation for photosynthesis.

Background

Topic: Photosynthesis

This question tests your ability to recall the overall balanced equation for photosynthesis.

Key Formula:

• General equation: $6CO_2 + 6H_2O + \text{light energy} \rightarrow C_6H_{12}O_6 + 6O_2$

Step-by-Step Guidance

1. Identify the reactants (carbon dioxide, water, light energy) and products (glucose, oxygen).

2. Write the balanced chemical equation for photosynthesis.

3. Note the stoichiometry (number of molecules of each reactant and product).

Try solving on your own before revealing the answer!

Q21. What is the initial energy source for photosynthesis?

Background

Topic: Photosynthesis – Energy Source

This question tests your understanding of where the energy for photosynthesis originates.

Key Terms:

• Sunlight: Main energy source for photosynthesis.

Step-by-Step Guidance

1. Identify the main energy source that drives photosynthesis.

2. Explain how this energy is captured by plant pigments.

Try solving on your own before revealing the answer!

Q22. What molecules are used for photosynthesis?

Background

Topic: Inputs of Photosynthesis

This question tests your knowledge of the reactants required for photosynthesis.

Key Terms:

• Carbon Dioxide ($CO_2$): Taken from the atmosphere.

• Water ($H_2O$): Absorbed from the soil.

Step-by-Step Guidance

1. List the main reactants needed for photosynthesis.

2. Explain the source of each molecule for the plant.

Try solving on your own before revealing the answer!

Q23. What molecules are produced by photosynthesis?

Background

Topic: Outputs of Photosynthesis

This question tests your knowledge of the products generated by photosynthesis.

Key Terms:

• Glucose ($C_6H_{12}O_6$): Main product, used for energy and structure.

• Oxygen ($O_2$): Byproduct released into the atmosphere.

Step-by-Step Guidance

1. List the main products of photosynthesis.

2. Explain the fate of each product in the plant or environment.

Try solving on your own before revealing the answer!

Q24. Explain the 2 steps of photosynthesis and where they occur.

Background

Topic: Stages of Photosynthesis

This question tests your understanding of the sequence and location of the main stages of photosynthesis.

Key Terms:

• Light Reactions: Occur in the thylakoid membranes.

• Calvin Cycle (Dark Reactions): Occur in the stroma.

Step-by-Step Guidance

1. Name the two main stages of photosynthesis.

2. Describe the location of each stage within the chloroplast.

3. Briefly summarize the main events of each stage.

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Q25. Label the Parts of the Chloroplasts and identify which stages of photosynthesis occur there.

Background

Topic: Chloroplast Structure and Function

This question tests your ability to identify chloroplast structures and relate them to photosynthesis stages.

Key Terms:

• Thylakoid: Site of light reactions.

• Stroma: Site of Calvin Cycle.

• Granum: Stack of thylakoids.

Step-by-Step Guidance

1. Label the main parts of the chloroplast (thylakoid, stroma, granum, outer membrane).

2. Identify which stage of photosynthesis occurs in each part.

3. Explain the significance of compartmentalization for photosynthesis efficiency.

Try solving on your own before revealing the answer!