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21 Questions on Microbiology Homework 6 | MCB 2010C, Assignments of Microbiology

Material Type: Assignment; Professor: Johnsen; Class: Microbiology; Subject: MCB: Microbiology; University: Valencia Community College; Term: Unknown 1989;

Typology: Assignments

2009/2010

Uploaded on 02/25/2010

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Microbiology Homework #6 Name ________________________
25 points- due ____________ VCC
Bacterial Growth and Metabolism, Viral Infections
(One point each, unless otherwise stated)
1. Macronutrients are often listed as CHONPS. What element does each letter represent AND give an
example of a molecule that exists both in you and in bacteria that contains each element: (2 points)
C =
H =
N=
P=
2. Which one of the following temperatures would most likely kill a mesophile?
a) 50°C
b) 9°C
c) 65°C
d) 0°C
e) 37°C
3. Flask A contains some yeast cells in glucose-minimal salts broth incubated at 30°C with aeration.
Flask B contains some yeast cells in glucose-minimal salts broth incubated at 30°C in an anaerobic jar.
a) which culture produced more ATP?
b) which culture produced more alcohol?
4. Locate the essay in your text on Halobacterium and answer the following questions:
a) Where could you find and how could you easily detect the presence of Halobacterium?
b) What chemical produced by these bacteria may be used to replace silicon chips and why can the
information be processed faster with this new type of computer chip?
5. a. Define metabolism
b. Show the relationship of metabolism, catabolism and anabolism in a mathematical equation.
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Download 21 Questions on Microbiology Homework 6 | MCB 2010C and more Assignments Microbiology in PDF only on Docsity!

Microbiology Homework #6 Name ________________________

25 points- due ____________ VCC

Bacterial Growth and Metabolism, Viral Infections

(One point each, unless otherwise stated)

  1. Macronutrients are often listed as CHONPS. What element does each letter represent AND give an example of a molecule that exists both in you and in bacteria that contains each element: (2 points) C = H = N= P=
  2. Which one of the following temperatures would most likely kill a mesophile? a) 50°C b) 9°C c) 65°C d) 0°C e) 37°C
  3. Flask A contains some yeast cells in glucose-minimal salts broth incubated at 30°C with aeration. Flask B contains some yeast cells in glucose-minimal salts broth incubated at 30°C in an anaerobic jar. a) which culture produced more ATP? b) which culture produced more alcohol?
  4. Locate the essay in your text on Halobacterium and answer the following questions: a) Where could you find and how could you easily detect the presence of Halobacterium? b) What chemical produced by these bacteria may be used to replace silicon chips and why can the information be processed faster with this new type of computer chip?
  5. a. Define metabolism b. Show the relationship of metabolism, catabolism and anabolism in a mathematical equation.
  1. Assume that after washing your hands, you leave 15 bacterial cells on a new bar of soap. If these cells undergo binary fission every 30 minutes, how many bacteria would you expect to find after 6 hours on the soap? SHOW WORK FOR CREDIT (2 points)
  2. Fill in the following table with the carbon source and the energy source for each type of organism and give one example of each: (2 points) C source Energy source Photoautotroph _______________ _______________ Chemoautotroph _______________ _______________ Photoheterotroph _______________ _______________ Chemoheterotroph _______________ _______________
  3. Why don’t foods containing high quantities of salt or sugar require refrigeration to prevent their spoilage?
  4. A. In what phase of a bacterial growth curve in a closed system do the numbers of viable bacteria remain steady even though many bacteria are dying? B. Why is the enzyme catalase important to the survival of many aerobic organisms? (be specific)
  5. Look up Hektoen agar in your lab manual and explain why it is both classified as a differential and a selective medium. Give specific examples of the types of bacteria that can grow on Hektoen agar and what different groups of microbes look like when they do grow on it. (2 points)
  6. A. What do we call organisms that require the addition of growth factors to their nutrient media in order to grow? B. What do we call bacteria that get their energy from inorganic minerals in rocks?
  1. A. What is the vaccine used to prevent mumps, rubella and rubeola? B. What is usually the first sign that a child has mumps?
  2. Read in your text book : “A Safe Blood Supply,” then answer this question: Why is a human blood supply with zero risk of transmitting all infectious diseases probably unattainable?
  3. After each statement below, write in the blank after the question whether it pertains to viral hepatitis type A, B, C, D, and/or E. (You will have more than one answer for some statements and each letter may be used more than once) a) Causes chronic liver disease ___________________ b) Has a CURRENT vaccine that is effective ___________________ c) Transmitted through fecal-oral contact ____________________ d) Cannot cause hepatitis without the presence of hepatitis B virus _________________ _________/ 25