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UTA Microbiology Exam 3 Questions With
Complete Solutions
nutrients - .....ANSWER... ✔✔ acquired from
environment & used for cellular activities
essential nutrients - .....ANSWER... ✔✔ substances that
must be provided to an organism
Ex: carbon, hydrogen, oxygen, nitrogen, phosphorus,
sulfur
micronutrients - .....ANSWER... ✔✔ needed in large
quantities
function in cell structure/metabolism
Ex: carbon, oxygen, hydrogen, nitrogen
inorganic nutrients - .....ANSWER... ✔✔ does not
contain carbon & hydrogen
organic nutrients - .....ANSWER... ✔✔ certain carbon
& hydrogen
product of living things
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heterotroph - .....ANSWER... ✔✔ organism that cannot
make its own food
must obtain its carbon in organic form to used for
metabolism
eats proteins, carbs, lipids, nucleic acids
Pseudimonas aeruginosa - .....ANSWER... ✔✔ gram
neg bacteria
doesn't cause disease
major pathogen in immunocompromised people
natural habitat is soil and water/infects hospital patients
autotroph - .....ANSWER... ✔✔ organism that makes
its own food
used inorganic CO2
converts CO2 into carbon compounds
nitrogen sources - .....ANSWER... ✔✔ primary source
for heterotrophs
must be degraded to basic building blocks
must be converted to NH3 before it enters in cell
Ex: nitrate, nitrite, ammonia
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oxygen sources - .....ANSWER... ✔✔ important in the
structural/enzymatic functions of the cell
component of carbs, lipids, nucleic acids, proteins
common component of inorganic salts
hydrogen sources - .....ANSWER... ✔✔ water slats
naturally occurring gases
used/produced by microbes
maintains pH
for hydrogen bonds
free energy in oxidation reactions of respiration
phosphorus sources - .....ANSWER... ✔✔ inorganic
source in phosphate
found in rocks
derived from phosphoric acid
key component of nucleic acids, ATP and coenzymes
essential to genetics of cells & viruses
sulfur sources - .....ANSWER... ✔✔ rocks & sediments
essential component of amino acids, methionine, cysteine
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form disulfide bridges that affects shape/stability of
proteins
growth factors - .....ANSWER... ✔✔ cannot be
synthesized by an organism
provided by the environment
essential nutrient
phototroph - .....ANSWER... ✔✔ uses sunlight
chemotroph - .....ANSWER... ✔✔ microbes that gain
energy from chemical compounds
photoautrophs - .....ANSWER... ✔✔ capture energy
from light rays and transform it into chemical energy
used for cell metabolism
produce organic molecules that can be self used and
used by other heterotrophs
forms the basis for most food web
chemoautotrophs - .....ANSWER... ✔✔ use organic
compounds for energy and inorganic compounds as a
carbon source
UTA Microbiology Exam 3 Questions With
Complete Solutions
nutrients - .....ANSWER... ✔✔ acquired from
environment & used for cellular activities
essential nutrients - .....ANSWER... ✔✔ substances that
must be provided to an organism
Ex: carbon, hydrogen, oxygen, nitrogen, phosphorus,
sulfur
micronutrients - .....ANSWER... ✔✔ needed in large
quantities
function in cell structure/metabolism
Ex: carbon, oxygen, hydrogen, nitrogen
inorganic nutrients - .....ANSWER... ✔✔ does not
contain carbon & hydrogen
organic nutrients - .....ANSWER... ✔✔ certain carbon
& hydrogen
product of living things
,2|Page
heterotroph - .....ANSWER... ✔✔ organism that cannot
make its own food
must obtain its carbon in organic form to used for
metabolism
eats proteins, carbs, lipids, nucleic acids
Pseudimonas aeruginosa - .....ANSWER... ✔✔ gram
neg bacteria
doesn't cause disease
major pathogen in immunocompromised people
natural habitat is soil and water/infects hospital patients
autotroph - .....ANSWER... ✔✔ organism that makes
its own food
used inorganic CO2
converts CO2 into carbon compounds
nitrogen sources - .....ANSWER... ✔✔ primary source
for heterotrophs
must be degraded to basic building blocks
must be converted to NH3 before it enters in cell
Ex: nitrate, nitrite, ammonia
,3|Page
oxygen sources - .....ANSWER... ✔✔ important in the
structural/enzymatic functions of the cell
component of carbs, lipids, nucleic acids, proteins
common component of inorganic salts
hydrogen sources - .....ANSWER... ✔✔ water slats
naturally occurring gases
used/produced by microbes
maintains pH
for hydrogen bonds
free energy in oxidation reactions of respiration
phosphorus sources - .....ANSWER... ✔✔ inorganic
source in phosphate
found in rocks
derived from phosphoric acid
key component of nucleic acids, ATP and coenzymes
essential to genetics of cells & viruses
sulfur sources - .....ANSWER... ✔✔ rocks & sediments
essential component of amino acids, methionine, cysteine
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form disulfide bridges that affects shape/stability of
proteins
growth factors - .....ANSWER... ✔✔ cannot be
synthesized by an organism
provided by the environment
essential nutrient
phototroph - .....ANSWER... ✔✔ uses sunlight
chemotroph - .....ANSWER... ✔✔ microbes that gain
energy from chemical compounds
photoautrophs - .....ANSWER... ✔✔ capture energy
from light rays and transform it into chemical energy
used for cell metabolism
produce organic molecules that can be self used and
used by other heterotrophs
forms the basis for most food web
chemoautotrophs - .....ANSWER... ✔✔ use organic
compounds for energy and inorganic compounds as a
carbon source
