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

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

Background

Topic: Forms of Energy in Biological Systems

This question is testing your understanding of the different types of energy relevant to biology and how organisms convert energy from one form to another.

Key Terms:

  • Kinetic Energy: Energy of motion.

  • Potential Energy: Stored energy due to position or structure.

  • 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 their environment (e.g., plants from sunlight, animals from food).

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

  4. Think of examples for each type of energy and how they are used or transformed in cells.

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 is testing 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 and Second Laws of Thermodynamics in your own words.

  2. Explain how these laws apply to biological systems, especially in the context of metabolism.

  3. Describe how enzymes affect the energy transformations in cells (e.g., by lowering activation energy, making reactions more efficient).

  4. Consider how entropy and energy conservation relate to enzyme-catalyzed reactions.

Try solving on your own before revealing the answer!

Q3. Compare and Contrast Endergonic vs. Exergonic Reactions.

Background

Topic: Energy Changes in Chemical Reactions

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

Key Terms and Formulas:

  • Endergonic Reaction: A reaction that absorbs free energy from its surroundings (non-spontaneous).

  • Exergonic Reaction: A reaction that releases free energy (spontaneous).

  • Gibbs Free Energy ():

Step-by-Step Guidance

  1. Define endergonic and exergonic reactions, focusing on energy flow and spontaneity.

  2. Use the Gibbs Free Energy equation to explain how determines the type of reaction.

  3. Provide examples of each type of reaction in biological systems (e.g., photosynthesis vs. cellular respiration).

  4. Compare the energy profiles (input vs. release) for both reactions.

Try solving on your own before revealing the answer!

Q4. Explain how enzymes work.

Background

Topic: Enzyme Structure and Function

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

Key Terms:

  • Active Site: The region on the enzyme where the substrate binds.

  • Substrate: The molecule upon which an enzyme acts.

  • Activation Energy: 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 enzyme-substrate complex forms ("lock and key" or "induced fit" models).

  3. Discuss how enzymes lower the activation energy of reactions.

  4. Consider how enzymes are specific to their substrates.

Try solving on your own before revealing the answer!

Q5. Explain 2 ways inhibitors work on enzymes.

Background

Topic: Enzyme Regulation

This question is testing your understanding of how enzyme activity can be controlled by inhibitors.

Key Terms:

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

  • Noncompetitive Inhibitor: Binds elsewhere on the enzyme, changing its 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 where the inhibitor binds and the outcome for the enzyme's activity.

Try solving on your own before revealing the answer!

Q6. Compare and Contrast Negative and Positive Feedback.

Background

Topic: Feedback Mechanisms in Biological Systems

This question is testing your understanding of how biological systems regulate themselves through feedback loops.

Key Terms:

  • Negative Feedback: A process that reduces or shuts off the original stimulus.

  • Positive Feedback: A process that amplifies the original stimulus.

Step-by-Step Guidance

  1. Define negative and positive feedback in your own words.

  2. Provide examples of each type of feedback in biological systems (e.g., temperature regulation vs. blood clotting).

  3. Compare the outcomes of each feedback type on system stability.

Try solving on your own before revealing the answer!

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