Multiple Choice
Identify the letter of the choice that
best completes the statement or answers the question.
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1.
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Pick
the indispensible laboratory substance extracted from seaweed, containing galactose and
sulfur: a. | agar | b. | peptidoglycan | c. | glycocalyx | d. | chitin | e. | cellulose | | |
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2.
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Even
though bacteria can be distinguished with the microscope, differentiation is limited. However,
bacteria have evolved diverse enzymes enabling to them to obtain __ and adapt to various
environmental conditions. Thus, bacteria in __ culture may be differentiated according to size,
shape, color, culture characteristics and metabolic pattern of digestive enzymes. a. | space, mixed | b. | nutrients, pure | | | | |
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3.
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The
ideal prerequisite for microbial detection and study is to manipulate microbes so they can
be: a. | seen | b. | heard | c. | smelled | d. | tasted | e. | felt | | |
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4.
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Typical clinical or environmental specimens consist of __ microbial populations and
the one of interest may be __ in the minority. a. | mixed, hidden | b. | pure, mixed | | | | |
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5.
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Broths, milks, or infusions are generally __ media that remain __ at refrigerator
temperature. a. | suspension,
settled | b. | liquid, fluid | | | | |
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6.
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The
basic distinction between a nutrient broth and solid media is in the absence or presence of
a: a. | dissolving
agent | b. | solidifying agent | | | | |
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7.
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Microbial media is used for: a. | primary isolation, | b. | maintain cultures | c. | bacterial identification | d. | transport | e. | all these | | |
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8.
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Nutrient medium containing blood, serum, vitamins and growth factors needed for
fastidious organisms is characteristic of: a. | general purpose media | b. | enriched media | | | | |
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9.
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Staphylococcus aureus is adapted to mildly salty environments like the skin and
nares. Mannitol salt agar (7.5% NaCl) will __ S. aureus growth but not accompanying bacteria
__ to that concentration of salt. a. | permit, sensitive | b. | suppress, tolerant | | | | |
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10.
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In
general, gram __ bacteria are inhibited by bile salts more than gram __ enteric
bacteria. a. | positive,
negative | b. | negative, positive | | | | |
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11.
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The pH
indicator dye/s incorporated in selective and differential media: a. | phenol red | b. | crystal violet | c. | neutral red | d. | methylene blue | e. | all of these | | |
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12.
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The
preparation of a secondary (or subsequent) culture from the original is called: a. | isolation | b. | subculture | c. | inspection/identification | d. | incubation | e. | inoculation | | |
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13.
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The
biological forms most resistant to microbial control are (the): a. | vegetative cells | b. | bacterial, fungal spores | c. | enveloped viruses | d. | trophozoites, cysts | e. | gram positive bacteria | | |
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14.
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Boiling water or steam are forms of __ heat that are more efficient antimicrobically
than heated dry air, except perhaps, for __. a. | moist, incineration | b. | chemical, exothermal reaction | | | | |
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15.
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Typical laboratory membrane filtration employs a filter of known pore __ that is
placed in a graduated funnel attached to a vacuum flask. Filters with pores smaller than
viruses yield __ fluids. a. | number, antiseptic | b. | size, sterile | | | | |
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16.
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Which
of the following could be used to sterilize plastic Petri plates in a plastic
wrapper? a. | ultraviolet | b. | ionizing radiation | c. | visible light | d. | dry heat | e. | pasteurization | | |
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17.
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Bacterial death will result from damage to which of the following
structures? a. | cell
wall | b. | plasma
membrane | c. | proteins | d. | nucleic acids | e. | all of the above | | |
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18.
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Which
concentration of ethyl or isopropyl alcohol is the most effective bactericide? a. | 100% | b. | 70% | c. | 50% | d. | 25% | e. | 10% | | |
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19.
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A
compound that is being REDUCED in a chemical reaction is the one that: a. | has lost hydrogen. | b. | has gained hydrogen. | c. | has gained oxygen. | d. | has gained phosphate. | e. | has lost phosphate. | | |
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20.
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What
is the fate of pyruvic acid (pyruvate) in an organism that uses aerobic respiration? a. | It is reduced to lactic acid. | b. | It is further oxidized in the Krebs
cycle. | c. | It is oxidized in
the electron transport chain. | d. | It is catalysed in glycolysis. | e. | It is reduced in the Krebs
cycle. | | |
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21.
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The
end products of aerobic cellular respiration are ATP energy, : a. | O2 and
H2O. | b. | CO2 and
H2O. | c. | pyruvate and glucose. | d. | CO2 and
O2. | e. | pyruvate and
CO2 | | |
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22.
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E. coli is a facultatively anaerobic organism. The fermentative
end product(s) of this organism is/are: a. | mixed acids | b. | CO2 and
H2O | c. | lactic
acid | d. | ethanol and
carbon dioxide | e. | butanediol and
acetoin | | |
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23.
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Enzymes, organic catalysts, are reused since they: a. | increase reactivity | b. | bind reactants | c. | are released intact | d. | facilitate certain reactions | e. | all of these | | |
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24.
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_____is not an electron carrier associated with the respiratory
chain. a. | pyruvic
acid | b. | NADP | c. | NADH | d. | coenzyme A | e. | FAD | | |
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25.
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An
environment that furnishes only inorganic salts and organic compounds as final electron acceptors,
cannot support __ organisms. a. | facultative anaerobes | b. | aerotolerant | c. | aerobic | d. | strict anaerobes | e. | all of these | | |
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