Cell Biology Reading Week 4 + 5
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Questions and Answers

What is the main focus when we talk about the chemical reactions within a cell?

  • Photosynthesis
  • Cellular respiration
  • Metabolism (correct)
  • Glycolysis
  • Which type of metabolic pathways produce cellular components?

  • Catabolic pathways
  • Synthetic pathways
  • Degrative pathways
  • Anabolic pathways (correct)
  • Which type of reaction characterizes catabolic pathways?

  • Hydrolysis of macromolecules (correct)
  • Polymer synthesis
  • Energy-releasing reactions
  • Biological reduction of carbon dioxide
  • What role do catabolic pathways play in cells?

    <p>Release free energy for cellular functions and produce building blocks for biosynthesis</p> Signup and view all the answers

    What is the compound formed by linking adenine and ribose called?

    <p>Adenosine</p> Signup and view all the answers

    Why is ATP considered to have energy-rich bonds?

    <p>The formation of phosphoanhydride bonds</p> Signup and view all the answers

    What is the main reason for the exergonic nature of ATP hydrolysis?

    <p>Charge repulsion in the phosphate groups</p> Signup and view all the answers

    What does the ATP/ADP pair represent in cellular energy dynamics?

    <p>A reversible means of conserving, transferring, and releasing energy</p> Signup and view all the answers

    What is the main purpose of glycolysis in cells?

    <p>To create energy without oxygen through fermentation</p> Signup and view all the answers

    Which phase of glycolysis results in the generation of NADH and ATP?

    <p>Oxidation reaction</p> Signup and view all the answers

    What is the fate of glucose molecules in cells that undergo glycolysis?

    <p>Split into two three-carbon molecules</p> Signup and view all the answers

    How does glycolysis differ in cells depending on the presence or absence of oxygen?

    <p>Switches to aerobic respiration in the absence of oxygen</p> Signup and view all the answers

    What is a characteristic feature of the overall glycolytic pathway?

    <p>Generates ATP at multiple steps</p> Signup and view all the answers

    What is the end product of the anaerobic process known as lactate fermentation?

    <p>Lactate</p> Signup and view all the answers

    Which enzyme is responsible for catalyzing the conversion of lactate to pyruvate in lactate fermentation?

    <p>Lactate dehydrogenase</p> Signup and view all the answers

    In alcoholic fermentation, what is the fate of the 2 pyruvate molecules?

    <p>Converted to ethanol and CO2</p> Signup and view all the answers

    What is the main energy-yielding pathway in many anaerobic bacteria?

    <p>Glycolysis</p> Signup and view all the answers

    Which industry heavily relies on alcoholic fermentation by yeast cells?

    <p>Baking, brewing, and winemaking industries</p> Signup and view all the answers

    Where are most of the enzymes of the citric acid cycle located in a bacterial cell?

    <p>Cytoplasm</p> Signup and view all the answers

    Why must polypeptides entering mitochondria be in an unfolded state?

    <p>To allow passage across the organelle membranes</p> Signup and view all the answers

    Which components of respiratory metabolism are located in the plasma membrane of bacterial cells?

    <p>Electron transport proteins</p> Signup and view all the answers

    What is the role of chaperone proteins in mitochondria?

    <p>Assist in folding polypeptides</p> Signup and view all the answers

    Where is the short circular DNA molecule of the mitochondrion located?

    <p>Mitochondrial matrix</p> Signup and view all the answers

    What is the main function of the citric acid cycle?

    <p>ATP generation</p> Signup and view all the answers

    Which intermediate is an important component of the citric acid cycle?

    <p>Citrate</p> Signup and view all the answers

    Which molecules are used as substrates in the citric acid cycle?

    <p>Acetyl-CoA, NAD+, FAD, ADP</p> Signup and view all the answers

    What is the primary form in which carbon enters the citric acid cycle?

    <p>Acetyl-CoA</p> Signup and view all the answers

    What is the main product of the catabolism of triacylglycerols?

    <p>Glycerol and free fatty acids</p> Signup and view all the answers

    How is pyruvate transported into the mitochondrial matrix for further processing?

    <p>Through active transport by ATP hydrolysis</p> Signup and view all the answers

    Which amino acids can be directly converted to pyruvate or citric acid cycle intermediates?

    <p>Alanine, aspartate, and glutamate</p> Signup and view all the answers

    What is another name for the citric acid cycle due to citrate's chemical structure?

    <p>Tricarboxylic acid cycle</p> Signup and view all the answers

    Who is credited with identifying and characterizing the citric acid cycle in the 1930s?

    <p>Hans Krebs</p> Signup and view all the answers

    What is the role of proteases in protein catabolism?

    <p>Hydrolyzing internal peptide bonds</p> Signup and view all the answers

    What is an important characteristic of flavoproteins and coenzyme NADH during electron transport?

    <p>Transfer of both electrons and protons</p> Signup and view all the answers

    Which complex transfers electrons from succinate to FAD to generate FADH2?

    <p>Complex 2</p> Signup and view all the answers

    What is the main role of cytochrome c oxidase (complex 4) in aerobic respiration?

    <p>Transfers electrons directly to oxygen</p> Signup and view all the answers

    In which direction are protons pumped during electron transport through complexes 1, 3, and 4?

    <p>From the intermembrane space to the matrix</p> Signup and view all the answers

    What is the unique feature of respirasomes in relation to respiratory complexes?

    <p>Organize respiratory complexes into supercomplexes in defined ratios</p> Signup and view all the answers

    Which condition favors electron transport and ATP generation according to the chemiosmotic model?

    <p>High ADP concentration</p> Signup and view all the answers

    What effect do uncoupling agents have on the proton gradient and ATP synthesis in mitochondria?

    <p>Decrease both</p> Signup and view all the answers

    What drives protons back into the mitochondrial matrix during ATP synthesis?

    <p>Proton motive force</p> Signup and view all the answers

    What is required for isolated complexes involved in electron transfer to be coupled to ATP synthesis?

    <p>Incorporation into membranes</p> Signup and view all the answers

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