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BIO 280 Exam 2 Dr. Herrick JMU; Questions and Answers $17.99   Add to cart

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BIO 280 Exam 2 Dr. Herrick JMU; Questions and Answers

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  • Course
  • BIOS 280
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  • BIOS 280

BIO 280 Exam 2 Dr. Herrick JMU; Questions and Answers

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  • September 18, 2024
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  • BIOS 280
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BIO 280 Exam 2 Dr. Herrick JMU; Questions and Answers


What are the problems inherent in studying microorganisms Correct Ans-They are invisible

and widely distributed; they usually need to grow under controlled situations, in lab; strains

must be separated




There are ____ to microscopy Correct Ans-limits




Most major discoveries in microbiology are Correct Ans-not based on anything one can see




Many microbiologists never ___ Correct Ans-look in a microscope




Microscopy is no the most important part of Correct Ans-microbiology




How do you study microorganisms without a microscope? Correct Ans-make billions of

cells to study rather than one, but all the cells have to be exactly alike.




To get a pure culture, you need Correct Ans-culturing techniques, and aseptic technique

,BIO 280 Exam 2 Dr. Herrick JMU; Questions and Answers
Pure cultures led to Correct Ans-the development of broths and, especially solid culture

media and techniques, sterilization, etc.


Koch's Postulate: 1 Correct Ans-The suspected pathogenic organism should be present in

all cases of the disease and absent from healthy animals




Koch's Postulate: 2 Correct Ans-The suspected organism should be grown in pure culture




Koch's Postulate: 3 Correct Ans-Cells from a pure culture of the suspected organism should

cause disease in healthy animal




Koch's Postulate: 4 Correct Ans-The organism should be reisolated and shown to be the

same as the original




Potential methodological difficulties for Postulate 1 Correct Ans-Personal safety;

difficulties in detection




Difficulties in disease detection Correct Ans-visibility, culturability, unknown life cycle

,BIO 280 Exam 2 Dr. Herrick JMU; Questions and Answers
What % of bacteria do we not know how to grow? Correct Ans-90%




What animal do we use to grow a certain type of bacteria? Correct Ans-Armadillos




What does not prove that a certain bacteria caused a disease? Correct Ans-association




How does HIV work within the body? Correct Ans-it hides in the T-Helper cells in our

immune system




Why is the 2nd postulate necessary? Correct Ans-Non-pure culture would confound

interpretation




Potential methodological difficulties for Postulate 2 Correct Ans-not all microorganisms

can be cultured




Why is the 4th postulate necessary? Correct Ans-There may have been something else

introduced, or someone could've made a mistake; this makes it certain that someone causes

this.

, BIO 280 Exam 2 Dr. Herrick JMU; Questions and Answers


What do you need for Koch's postulates to be met? Correct Ans-a pure culture




Culture Correct Ans-the observable growth in a medium




medium Correct Ans-a nutrient solution - solid, liquid, or semisolid - used to grow

microorganisms




Inoculation Correct Ans-verb pertaining to growth in a medium; intro of small sample into

a medium for growth




A colony is normally the product of only one or very few cells (T/F) Correct Ans-TRUE




How do we get a pure culture? Correct Ans-isolate cells

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