Read the summary and the most important questions on BMS 212

• Exam 1

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• All of the following are true except:A) Resolution is the ability to separate 2 closely spaced objectsB) Magnification of a specimen is only limited by the lens you useC) Contrast separates organisms from the backgroundD) Resolution is dependent on a fixed quantity and a variable componentE) Bright field is considered the most common microscopy

  B) Magnification is also affected by the eyepiece

• During replication a virus seizes control of host cells synthetic and genetic machinery. This control dictates everything about the viral life cycle except:A) The level of pathogenicityB) How it is transmitted to another cell C) How our immune defenses will respondD) All 3E) A and C

  D) All 3 are correct

• Under a microscope, the specimen is unstained and bright in appearance. The background is black. Internal detail is poor but the outline is very clear. Which microscope is being used?

  Dark field microscope

• Which is not a component of cell walls:A) peptidoglycanB) lipotechoic acidC) mycolic acidD) tetrapeptideE) tubulin

  E) tubulin

• Bacteria store nutrients in ______

  Inclusions

• What are the 5 stages of bacteriophage infection?

  1) Attack - attachment to specific receptors
  2) Penetration - lysozymes open cell wall, DNA inserted into cell
  3) Replication - Host DNA degraded, host cell replicates viral DNA
  4) Assembly - Self assembly and transduction occur
  5) Release  - cell lyses, virus is released

• Which phase of the bacteriophage infection is lysozyme critical to?

  Both entry and release

• Gram + bacteria cells could contain all of the following except:A) FimbriaB) Cell membranesC) FlagellaD) EndosporesE) Sex pilus

  E) sex pili are found only on gram - bacteria

• A petri plate with an unintended, unknown organism is:

  a contaminated culture

• If the GC content of 2 organisms is both 45%, the organisms areA) definitely relatedB) definitely not relatedC) may or may not be relatedD) the AT content = 65%E) they are definitely related and the AT content = 65%

  C) may or may not be related. also, % must = 100