practice exam Flashcards
which of the following mechanisms used to transport substances across the bacterial cell wall requires energy?
active transport
in the scientific name, E. coli, coli is the _____
species
resolution refers to _________
ability to distinguish two objects as two objects
which of the following is the same size as 1 um bacterial cell
1000 nm mitochondria
place the parts of the compound light microscope in the order that light passes through them on the way to the observer’s eyes: (1) condenser, (2) ocular lens, (3) illuminator, (4) specimen, (5) objective lens
3-1-4-5-2
heat fixing is important when preparing stains because it
adheres the cells to the slide
the following types of microorganisms are correctly matched except:
a. bacteria-prokaryotic
b. fungi-eukaryotic
c. archaea-eukaryotic
C
the first observations of microorganisms were made in the 17th century by
van Leewenhoek
all of the following are functions of the prokaryotic glycocalyx EXCEPT:
a. protection from phagocytosis
b. attachment to environmental surface
c. protection against dehydration
d. toxicity to humans
D
when using a compound light microscope, a 2 um bacterial cell is BEST seen at which magnification?
1000x
from the following list, select the ingredient that would make a medium complex
peptone
all of the following statements are true about gram positive cells compared to gram negative cells except:
a. gram + cells have more peptidoglycan
b. gram + cells are sensitive to penicillin
c. gram + cells are decolorized by alcohol
d. gram + cells possess teichoic acids
C
which of the following statements about bacteria is not true?
a. essential to the prescence of life on earth
b. used to make some foods and drinks
c. everyone has bacteria in and on the body
d. the only good bacteria is a dead bacterium
D
Spallanzani designed experiments to disprove spontaneous generation. Needham’s argument against these experiments was that
heating had weakened the vital force necessary for life
pseudomurein is found in the cell walls of ____
archaea
all of the following are true about endospores except they:
a. are resistant to heating, desiccation, and chemicals
b. form under adverse conditions
c. do not survive very long in the environment
d. evolved as adaptations very early in evolutionary time
C
what type of microscope would you use to study the internal structures in living eukaryotic cells?
phase-contrast
the laboratory procedures employed to prevent microbial contamination are called
aseptic techniques
which of the following is the correctly written scientific name?
a. Paramecium Caudatum (italized)
b. Paramecium caudatum
c. paramecium caudatum
d. Paramecium caudatum (italized)
D.
which of the following statements is the best definition of spontaneous generation
nonliving matter gives rise to living organisms
the gram stain is a differential staining technique that takes advantage of differences in the
thickness of peptidoglycan in the cell wall
when you introduce microorganisms to a growth medium, this is termed ____
inoculation
which cell wall component renders some microorganisms impermeable to most stains?
mycolic acid
Escherichia coli stains ____
gram negative
