front 1 Which set of four elements makes up the largest portion of cells by
dry weight? | back 1 C) carbon, hydrogen, oxygen, nitrogen |
front 2 Any substance, whether in elemental or molecular form, that must be
provided to an organism is called a(n) | back 2 B) essential nutrient. |
front 3 A micronutrient can also be called | back 3 A) a trace element. |
front 4 Microbial cell cytoplasm is composed mostly of | back 4 A) water and protein. |
front 5 An autotroph | back 5 A) uses inorganic carbon dioxide as its carbon source. |
front 6 Nitrogen is vital to microbial growth. It is obtained from organic or
inorganic sources to make | back 6 D) all of the above. |
front 7 A ____________ metabolizes the organic matter of dead
organisms. | back 7 B) saprobe |
front 8 Extracellular digestion in bacteria and fungi | back 8 C) facilitates transport of nutrients in. |
front 9 When the environment is equal in solute concentration to the cell's
internal environment then there is no net change in cell volume. This
indicates a(n) ____________ solution around the cell. | back 9 C) isotonic |
front 10 Cell walls are useful for structural integrity as well as to keep a
cell from bursting in a(an) solution. | back 10 A) hypotonic |
front 11 The majority of medically significant microorganisms are | back 11 B) mesophiles. |
front 12 An organism that is capable of living without oxygen if necessary is
termed a(n) | back 12 B) facultative anaerobe. |
front 13 Most cultured bacteria tend to multiply by | back 13 A) binary fission. |
front 14 During this phase of growth, newly inoculated cells require a period
of adjustment, enlargement, and synthesis. | back 14 D) lag phase |
front 15 The duration of each bacterial division is called the generation
or | back 15 C) doubling time. |
front 16 Assuming I had a single bacterium that could undergo binary fission
every 30 minutes, how many bacteria would I have at the end of 7
hours? | back 16 D) 214 |
front 17 Cell numbers can be counted directly by all of the following
EXCEPT | back 17 D) turbidity. |
front 18 The stationary growth phase in a bacterial growth chart is due to all
of the following EXCEPT | back 18 C) a period of adjustment to growing conditions. |
front 19 The optimum pH for most culturable microbes ranges between | back 19 C) 6-8. |
front 20 Microbes in most environments form ecological associations with other
organisms. The term for a symbiotic relationship beneficial to both
partners is termed a | back 20 B) mutualism. |
front 21 Microorganisms which exist under high pressure are called | back 21 B) barophiles. |
front 22 Phagocytosis and pinocytosis are forms of | back 22 D) active transport. |
front 23 The word root troph means | back 23 C) food/feeding |
front 24 The word root phile means | back 24 A) love |
front 25 The word root thermo means | back 25 B) heat |
front 26 The word root auto means | back 26 B) self |
front 27 The word root hetero means | back 27 A) other |
front 28 The word root photo means | back 28 C) light |
front 29 A microbiologist inoculates staphylococcus aureus into a culture medium. following incubation, both staphylococcus aureus and staphylococcus epidermis are determined to be growing in this culture. what is the most likely explanation? A) The culture medium was differential B) The microbiologist used too inoculum C) The culture medium was selective D) The culture was contaminated | back 29 D) The culture was contaminated |
front 30 Agar is important component of media because A) agar prevents contamination B) Bacteria require agar as a source of carbon C) Agar inhibits mold growth D) Agar provides a solid surface for bacterial growth | back 30 D.) Agar provides a solid surface for bacterial Growth |
front 31 the term that refers to the purposeful addition of microorganisms into a laboratory nutrient medium is A) isolation B) Inoculation C) infection D) Contamination | back 31 B) inoculation |
front 32 A pure culture contains A) only bacteria B) A variety of species from the same genus C) Microbes from a single source D) Only one identified species of microorganism | back 32 D) only one identified species of microorganism |
front 33 A nutrient medium that contains at least one ingredient that is not chemically defined is termed A) Enriched B) Synthetic C) Complex D) Reducing | back 33 C) Complex |
front 34 An organic nutrient that cannot be synthesized by the organism and must be provided is called a A) Growth factor B) Compound C) Element D) Macronutrient | back 34 A) Growth factor |
front 35 Which of the following is not a major element of a microbial cell A) Oxygen B) Hydrogen C) Copper D) Carbon | back 35 C) Copper |
front 36 Microorganism require large quantities of_____ for use in cell structure and metabolism A) Macronutrients B) Electrolytes C) Trace elements D) Water | back 36 A) Macronutrients |
front 37 An organism that use CO2 for its carbon needs and sunlight for its energy needs would be called a____ A) Photoautotroph B) Heterotroph C) Chemo heterotroph D) Saprobe | back 37 A) Photoautotroph |
front 38 Diffusion of water through a semipermeable membrane is called A) Facilitated diffusion B) Osmosis C) Active transport D) Endocytosis | back 38 B) osmosis |