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Microbiology Chapter 5: Cellular Metabolism and Energy Production Study Guide

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Q1. What are the oxidized and reduced forms of NADH?

Background

Topic: Redox Reactions in Cellular Metabolism

This question tests your understanding of electron carriers, specifically NAD+ and NADH, and their roles in oxidation-reduction (redox) reactions during cellular respiration.

Key Terms and Concepts:

  • Oxidation: Loss of electrons

  • Reduction: Gain of electrons

  • NAD+: Nicotinamide adenine dinucleotide (oxidized form)

  • NADH: Reduced form (after gaining electrons and a proton)

Step-by-Step Guidance

  1. Recall that NAD+ acts as an electron acceptor in metabolic pathways.

  2. When NAD+ accepts electrons (and a proton), it becomes NADH (the reduced form).

  3. When NADH donates electrons, it is oxidized back to NAD+.

Try solving on your own before revealing the answer!

Q2. Where is ATP synthesized in the prokaryotic cell and in the eukaryotic cell?

Background

Topic: Cellular Respiration and ATP Synthesis

This question focuses on the cellular locations where ATP is produced in prokaryotes and eukaryotes, especially during oxidative phosphorylation.

Key Terms and Concepts:

  • ATP (Adenosine Triphosphate): Main energy currency of the cell

  • Prokaryotic cell: Lacks membrane-bound organelles

  • Eukaryotic cell: Contains membrane-bound organelles, including mitochondria

  • Electron Transport Chain (ETC): Site of most ATP synthesis

Step-by-Step Guidance

  1. Recall that in eukaryotic cells, the ETC is located in the inner mitochondrial membrane.

  2. In prokaryotic cells, which lack mitochondria, the ETC is found in the plasma (cell) membrane.

  3. ATP synthase is the enzyme responsible for synthesizing ATP in both cell types.

Try solving on your own before revealing the answer!

Q3. What are the major groups of enzymes called that break down proteins and lipids?

Background

Topic: Enzymes in Catabolism

This question tests your knowledge of the specific enzyme classes responsible for hydrolyzing proteins and lipids during cellular metabolism.

Key Terms and Concepts:

  • Proteases: Enzymes that break down proteins into amino acids

  • Lipases: Enzymes that break down lipids (fats) into fatty acids and glycerol

Step-by-Step Guidance

  1. Recall the general names for enzymes that hydrolyze proteins and lipids.

  2. Think about the suffix "-ase" which is commonly used for enzymes.

  3. Match the substrate (protein or lipid) to the appropriate enzyme group.

Try solving on your own before revealing the answer!

Q4. Reactions that have both breakdown and synthesis results are called:

Background

Topic: Metabolic Pathways

This question is about the types of metabolic reactions that involve both catabolic (breakdown) and anabolic (synthesis) processes.

Key Terms and Concepts:

  • Catabolism: Breakdown of molecules to release energy

  • Anabolism: Synthesis of complex molecules from simpler ones

  • Amphibolic pathways: Pathways that function in both breakdown and synthesis

Step-by-Step Guidance

  1. Recall the definitions of catabolic and anabolic reactions.

  2. Think about metabolic pathways that can operate in both directions.

  3. Identify the term used for pathways that are both catabolic and anabolic.

Try solving on your own before revealing the answer!

Q5. Production of ATP by oxidative phosphorylation takes place here:

Background

Topic: Oxidative Phosphorylation

This question asks you to identify the cellular location where oxidative phosphorylation occurs.

Key Terms and Concepts:

  • Oxidative phosphorylation: ATP production using energy from the electron transport chain

  • Electron Transport Chain (ETC): Series of proteins that transfer electrons

  • ATP synthase: Enzyme that synthesizes ATP

Step-by-Step Guidance

  1. Recall where the ETC is located in eukaryotic cells (mitochondria) and prokaryotic cells (plasma membrane).

  2. Think about the membrane structure required for a proton gradient.

  3. Identify the specific site where ATP synthase is embedded.

Try solving on your own before revealing the answer!

Q6. Conversion of pyruvic acid (C3) to acetyl CoA (C2) takes place here:

Background

Topic: Cellular Respiration – Link Reaction

This question focuses on the cellular compartment where pyruvate is converted to acetyl CoA, a key step linking glycolysis and the Krebs cycle.

Key Terms and Concepts:

  • Pyruvic acid (pyruvate): End product of glycolysis

  • Acetyl CoA: Entry molecule for the Krebs cycle

  • Link reaction: Conversion of pyruvate to acetyl CoA

Step-by-Step Guidance

  1. Recall where glycolysis and the Krebs cycle occur in eukaryotic and prokaryotic cells.

  2. Think about the compartment where pyruvate is transported before entering the Krebs cycle in eukaryotes.

  3. Consider the analogous location in prokaryotes, which lack mitochondria.

Try solving on your own before revealing the answer!

Q7. Conversion of glucose (C6) to two molecules of pyruvic acid (C3) takes place in this pathway:

Background

Topic: Glycolysis

This question tests your knowledge of the metabolic pathway responsible for breaking down glucose into pyruvate.

Key Terms and Concepts:

  • Glycolysis: Metabolic pathway that converts glucose to pyruvate

  • Glucose (C6): Six-carbon sugar

  • Pyruvic acid (C3): Three-carbon end product

Step-by-Step Guidance

  1. Recall the main metabolic pathways of cellular respiration.

  2. Identify which pathway starts with glucose and ends with pyruvate.

  3. Remember the number of carbons in glucose and pyruvate to confirm the pathway.

Try solving on your own before revealing the answer!

Q8. Acetyl CoA (C2) joins with oxaloacetic acid (C4) to form citric acid (C6) and then returns to acetyl CoA (C2) where?

Background

Topic: Krebs Cycle (Citric Acid Cycle)

This question is about the metabolic cycle where acetyl CoA combines with oxaloacetate to form citric acid, which is then metabolized back to oxaloacetate.

Key Terms and Concepts:

  • Krebs Cycle (Citric Acid Cycle): Series of reactions in aerobic respiration

  • Oxaloacetic acid (C4): Four-carbon molecule

  • Citric acid (C6): Six-carbon molecule

Step-by-Step Guidance

  1. Recall the steps of the Krebs cycle and the molecules involved.

  2. Identify the cellular compartment where the Krebs cycle occurs in eukaryotes and prokaryotes.

  3. Think about the cyclical nature of the pathway and its location.

Try solving on your own before revealing the answer!

Q9. Other than ATP production, what is an important major outcome of the Krebs cycle?

Background

Topic: Krebs Cycle Products

This question asks you to identify another significant product of the Krebs cycle besides ATP.

Key Terms and Concepts:

  • NADH and FADH2: Electron carriers produced in the Krebs cycle

  • CO2: Waste product released

Step-by-Step Guidance

  1. List all products of the Krebs cycle (ATP, NADH, FADH2, CO2).

  2. Identify which products are used in the next stage of cellular respiration.

  3. Consider the importance of electron carriers for the electron transport chain.

Try solving on your own before revealing the answer!

Q10. The addition of a phosphate group to a molecule (e.g., ADP + P → ATP) is called:

Background

Topic: Phosphorylation

This question tests your knowledge of the process by which a phosphate group is added to a molecule, such as in ATP synthesis.

Key Terms and Concepts:

  • Phosphorylation: Addition of a phosphate group

  • ADP (Adenosine Diphosphate): Accepts a phosphate to become ATP

  • ATP (Adenosine Triphosphate): Main energy molecule

Step-by-Step Guidance

  1. Recall the general term for adding a phosphate group to a molecule.

  2. Think about the different types of phosphorylation (substrate-level, oxidative, photophosphorylation).

  3. Identify the term that applies to the process described in the question.

Try solving on your own before revealing the answer!

Q11. The removal of a CO2 group is called:

Background

Topic: Decarboxylation

This question is about the process by which a carboxyl group is removed from a molecule, releasing carbon dioxide.

Key Terms and Concepts:

  • Decarboxylation: Removal of a carboxyl group, releasing CO2

Step-by-Step Guidance

  1. Recall the metabolic steps where CO2 is released (e.g., link reaction, Krebs cycle).

  2. Identify the general term for the removal of a carboxyl group.

  3. Think about the root words: "de-" (removal) and "carboxyl" (CO2 group).

Try solving on your own before revealing the answer!

Q12. What type of cells (prokaryotic/eukaryotic) carry out glycolysis?

Background

Topic: Glycolysis in Different Cell Types

This question tests your understanding of whether glycolysis is universal among cell types.

Key Terms and Concepts:

  • Glycolysis: Metabolic pathway for glucose breakdown

  • Prokaryotic cells: Bacteria and Archaea

  • Eukaryotic cells: Animals, plants, fungi, protists

Step-by-Step Guidance

  1. Recall the universality of glycolysis in living organisms.

  2. Think about whether both prokaryotes and eukaryotes need to generate ATP from glucose.

  3. Consider the evolutionary significance of glycolysis.

Try solving on your own before revealing the answer!

Q13. Give the energy yield of the complete oxidation of 1 molecule of glucose to CO2 and H2O

Background

Topic: Cellular Respiration – ATP Yield

This question asks you to calculate the total ATP produced from one molecule of glucose through aerobic respiration.

Key Terms and Concepts:

  • Glycolysis: Produces ATP and NADH

  • Krebs Cycle: Produces ATP, NADH, FADH2

  • Electron Transport Chain: Uses NADH and FADH2 to generate ATP

Step-by-Step Guidance

  1. List the ATP produced in glycolysis, Krebs cycle, and by oxidative phosphorylation.

  2. Calculate the ATP equivalents from NADH and FADH2 (using standard conversion factors).

  3. Add up the total ATP yield from all stages.

Try solving on your own before revealing the answer!

True/False Section: Concerning Energy Production in Living Systems

Background

Topic: Energy Production and Metabolic Pathways

This section tests your understanding of key concepts in cellular energy production, including exergonic reactions, electron carriers, energy transfer, and metabolic diversity.

Key Terms and Concepts:

  • Exergonic reaction: Releases energy

  • Electron carriers: Molecules like NAD+, FAD

  • Glycolysis, Krebs cycle, fermentation: Different energy-yielding pathways

Step-by-Step Guidance

  1. For each statement, determine if it is true or false based on your knowledge of metabolism.

  2. If a statement is false, correct it to make it true (as instructed).

  3. For statements about glycolysis, recall alternative pathways (e.g., pentose phosphate, Entner-Doudoroff).

  4. For statements about the location of glycolysis or the Kreb's cycle, recall the correct cellular compartments.

  5. For oxygen requirements, remember glycolysis can occur with or without oxygen.

Try solving on your own before revealing the answer!

Be able to define:

  • Aerobic respiration

  • Anaerobic respiration

  • Chemiosmosis

  • Fermentation

  • Oxidative Phosphorylation

  • Substrate-level Phosphorylation

  • Photophosphorylation

Background

Topic: Key Metabolic Processes

This section requires you to define important terms related to cellular energy production and metabolism.

Key Terms and Concepts:

  • Review the definitions and differences between each process (e.g., oxygen requirement, location, ATP yield).

  • Understand the role of electron transport chains, light energy, and substrate-level phosphorylation in ATP synthesis.

Step-by-Step Guidance

  1. Write a concise definition for each term, focusing on its role in metabolism.

  2. Include key features such as oxygen use, location, and energy yield where relevant.

  3. Compare and contrast similar terms (e.g., oxidative vs. substrate-level phosphorylation).

Try solving on your own before revealing the answer!

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