Production of Biofuels from Biomass Case Study
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Questions and Answers

Which type of biomass is structurally different from biofuels?

  • Sugar crops
  • Cereal crops
  • Lignocellulose (correct)
  • Sweet sorghum

    • What is the focus of the case study?

  • The advantages of traditional fuels over biofuels
  • The challenges of producing biofuels from biomass (correct)
  • The extraction process of bioethanol
  • The production process of bioethanol from sugar crops

    • What is described as the 'oldest' biofuel in the case study?

  • Bioethanol (correct)
  • Traditional fuels
  • Sugar beet
  • Isobutanol

    • Which platform is used for the production of bioethanol from wood and agricultural residues?

    <p>Cellulose platform</p> Signup and view all the answers

    What is the main focus of the Ehrlich pathway mentioned in the text?

    <p>Isobutanol production in micro-organisms</p> Signup and view all the answers

    What is the focus of microbial engineering approaches mentioned in the text?

    <p>Increasing isobutanol production in micro-organisms</p> Signup and view all the answers

    Which process involves the pretreatment of wood, grass, and agricultural residues for bioethanol production?

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

    What is the importance of sustainable and renewable biofuels?

    <p>To reduce reliance on traditional fuels</p> Signup and view all the answers

    Which type of biofuel is described as more flexible and versatile compared to current biofuels?

    <p>1</p> Signup and view all the answers

    What is the focus of metabolic engineering/synthetic biology in relation to biofuels?

    <p>Improving production and efficiency of biofuels</p> Signup and view all the answers

    What is the purpose of the milling step in the production of bioethanol from starch-containing cereals?

    <p>To release the starch components from the cereal grains</p> Signup and view all the answers

    What is the main function of saccharification in the production of bioethanol?

    <p>To convert oligosaccharides and dextrin into glucose</p> Signup and view all the answers

    During which step does the conversion of sugar into bioethanol and CO2 take place?

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

    What is the purpose of distillation and rectification in bioethanol production?

    <p>To concentrate and clean the ethanol produced by distillation</p> Signup and view all the answers

    What is the purpose of drying (dehydration) in bioethanol production?

    <p>To remove any remaining water from the bioethanol</p> Signup and view all the answers

    What is the primary role of α-amylase in the liquefaction process during bioethanol production?

    <p>To degrade starch into oligosaccharides and dextrin</p> Signup and view all the answers

    What happens to pyruvate under aerobic conditions during glycolysis-fermentation?

    <p>It enters Krebs cycle/oxidative phosphorylation</p> Signup and view all the answers

    What is the outcome of glycolysis-fermentation under anaerobic conditions in yeast?

    <p>It yields ethanol and CO2</p> Signup and view all the answers

    What is the initial effect of low yeast cell concentration during fermentation?

    <p>Limited production of ethanol and CO2</p> Signup and view all the answers

    What indicates that the fermentation has become very active during the next stage of fermentation?

    <p>Rapid ethanol, CO2, and energy production</p> Signup and view all the answers

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