Types of Bacteria Based on Oxygen Requirements
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Questions and Answers

Which type of bacteria can grow in the presence or absence of oxygen?

  • Obligate anaerobes
  • Aerotolerant anaerobes
  • Microaerophilic bacteria
  • Facultative anaerobes (correct)
  • Which type of bacteria require low concentrations of oxygen to grow?

  • Microaerophilic bacteria (correct)
  • Obligate anaerobes
  • Aerotolerant anaerobes
  • Facultative anaerobes
  • Which bacteria can't use oxygen but can tolerate its presence?

  • Aerotolerant anaerobes (correct)
  • Obligate anaerobes
  • Facultative anaerobes
  • Microaerophilic bacteria
  • Which bacteria require higher concentrations of CO2 in the atmosphere surrounding their culture?

    <p>Obligate anaerobes</p> Signup and view all the answers

    Which basic chemical reactions are involved in bacterial metabolism?

    <p>Anabolism and Catabolism</p> Signup and view all the answers

    What is bacterial growth defined as?

    <p>Increase in cell number through binary fission</p> Signup and view all the answers

    During binary fission, what is the first step that occurs?

    <p>Cell elongates and DNA is replicated</p> Signup and view all the answers

    Which method is used to measure bacterial growth by counting the number of cells seen under a microscope?

    <p>Direct microscopic count</p> Signup and view all the answers

    What does generation time refer to in bacterial growth?

    <p>Time required for one complete cell division</p> Signup and view all the answers

    Which factor regulates bacterial growth in a lab setting?

    <p>Nutritional environment</p> Signup and view all the answers

    What is the purpose of culture media in bacterial growth?

    <p>To provide nutrients for bacterial growth</p> Signup and view all the answers

    Where do psychrotrophs thrive and are responsible for most low-temperature food spoilage?

    <p>15 to 20 ℃</p> Signup and view all the answers

    Which microbe group prefers an optimum temperature commonly around 37 ℃?

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

    Where can extreme thermophiles (hyperthermophiles) be found?

    <p>Volcanic and ocean vents</p> Signup and view all the answers

    At which pH range do neutrophiles prefer to grow?

    <p>6.5 to 7.5</p> Signup and view all the answers

    Which microbe produces lactic acid and tolerates mild acidity?

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

    What is the optimum temperature for thermophiles?

    <p>&gt;80 ℃</p> Signup and view all the answers

    What is the main purpose of bacterial metabolism?

    <p>To generate energy</p> Signup and view all the answers

    What is the primary source of energy for microorganisms in catabolism?

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

    Which process involves the gain of hydrogens and/or electrons?

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

    How do bacteria typically break down nutritive material in catabolism?

    <p>By secreting enzymes</p> Signup and view all the answers

    What does anabolism primarily involve?

    <p>Forming cellular structures and molecules</p> Signup and view all the answers

    Which of the following is an end product resulting from fermentation in bacterial metabolism?

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

    What is the role of enzymes in reduction-oxidation reactions?

    <p>Act as catalysts to speed up the reactions</p> Signup and view all the answers

    In a redox reaction, the substance that gets oxidized is known as:

    <p>Electron acceptor</p> Signup and view all the answers

    Which of the following is NOT an example of a metallic cofactor involved in redox reactions?

    <p>Vitamin B</p> Signup and view all the answers

    What is the primary function of oxidative phosphorylation in cellular respiration?

    <p>Transfer of electrons to generate ATP</p> Signup and view all the answers

    What characterizes organism that can carry out aerobic respiration?

    <p>Oxidation of glucose to pyruvic acid</p> Signup and view all the answers

    Where does the electron transport system and oxidative phosphorylation occur in bacteria?

    <p>Within the cell membrane</p> Signup and view all the answers

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