5/16/25, 6:53 AM MBIO 3401 EXAM 3 | PRINCIPLES OF MICROBIOLOGY EXAM | ALL QUESTIONS AND CORRECT ANSWERS (DETAILED ANS…
MBIO 3401 EXAM 3 | PRINCIPLES OF
MICROBIOLOGY EXAM | ALL QUESTIONS AND
CORRECT ANSWERS (DETAILED ANSWERS) |
LATEST EXAM 2025 | GRADED A+
which of the following is b) NADPH
the reducing cofactor
typically used in
biosynthesis?
a) NADH
b) NADPH
c) FAD
d) FADH2
… 1/32
,5/16/25, 6:53 AM MBIO 3401 EXAM 3 | PRINCIPLES OF MICROBIOLOGY EXAM | ALL QUESTIONS AND CORRECT ANSWERS (DETAILED ANS…
Which of the following is c) gene duplications to allow for redunancy in
NOT a strategy used by biosynthetic pathways
microbes to control the
energetic costs of
biosynthesis?
a)Reductive evolution to
eliminate genes for whose
enzymatic products can
be obtained from other
organisms through
cooperation or parasitism
b)Outcompeting other
organisms for scarce
resources
c)Gene duplications to
allow for redundancy in
biosynthetic pathways
d)Tightly regulating
metabolic processes to
prevent production of
metabolites when not
necessary
All of the following d) It catalyzes the addition of CO2 to xylulose 5
statements about Rubisco phosphate.
are true EXCEPT
a)It is found in
carboxysomes in many
bacteria.
b)It is one of the most
prevalent proteins on
Earth.
c)It consists of small (S)
and large (L) subunits.
d)It catalyzes the addition
of CO2 to xylulose 5
phosphate.
… 2/32
,5/16/25, 6:53 AM MBIO 3401 EXAM 3 | PRINCIPLES OF MICROBIOLOGY EXAM | ALL QUESTIONS AND CORRECT ANSWERS (DETAILED ANS…
How many turns of the d) six
Calvin cycle does it take
to feed one molecule of
glyceraldehyde-3-
phosphate into the
biosynthesis of glucose?
a)One
b)Two
c)Three
d)Six
e) None of the above
Which of the following is b) CO2 cannot be fixed via other mechanisms.
NOT a reason why the
Calvin cycle might have
evolved requiring many
different enzymes
producing many different
metabolic intermediates?
a) Many of the
intermediates are also
used as substrates for
biosynthesis of other
organic compounds.
b) CO2 cannot be fixed via
other mechanisms
c) The energy flow is
broken down into
reactions with near-zero
values of ΔG.
d) The reactions are
relatively easily reversible.
e) None of the above
… 3/32
, 5/16/25, 6:53 AM MBIO 3401 EXAM 3 | PRINCIPLES OF MICROBIOLOGY EXAM | ALL QUESTIONS AND CORRECT ANSWERS (DETAILED ANS…
Why are fatty acids b) they are constructed from repeating units.
suitable for modular
synthesis?
a) They are synthesized in
multiple different cellular
locations.
b) They are constructed
from repeating units.
c) Substrates for synthesis
are not readily available in
the cell.
d) They have multiple,
varied R groups.
Why might organisms alter a) Unsaturated fatty acids are less rigid and maintain
their fatty acid membrane flexibility at lower temperatures.
composition based on
temperature?
a) Unsaturated fatty acids
are less rigid and maintain
membrane flexibility at
lower temperatures.
b) Fatty acids are more
costly to synthesize at
higher temperatures.
c) Fatty acids must be
longer at lower
temperatures to prevent
membrane freezing.
d) Saturated fatty acids
make the membrane more
permeable, allowing
greater solute diffusion at
lower temperatures.
… 4/32
MBIO 3401 EXAM 3 | PRINCIPLES OF
MICROBIOLOGY EXAM | ALL QUESTIONS AND
CORRECT ANSWERS (DETAILED ANSWERS) |
LATEST EXAM 2025 | GRADED A+
which of the following is b) NADPH
the reducing cofactor
typically used in
biosynthesis?
a) NADH
b) NADPH
c) FAD
d) FADH2
… 1/32
,5/16/25, 6:53 AM MBIO 3401 EXAM 3 | PRINCIPLES OF MICROBIOLOGY EXAM | ALL QUESTIONS AND CORRECT ANSWERS (DETAILED ANS…
Which of the following is c) gene duplications to allow for redunancy in
NOT a strategy used by biosynthetic pathways
microbes to control the
energetic costs of
biosynthesis?
a)Reductive evolution to
eliminate genes for whose
enzymatic products can
be obtained from other
organisms through
cooperation or parasitism
b)Outcompeting other
organisms for scarce
resources
c)Gene duplications to
allow for redundancy in
biosynthetic pathways
d)Tightly regulating
metabolic processes to
prevent production of
metabolites when not
necessary
All of the following d) It catalyzes the addition of CO2 to xylulose 5
statements about Rubisco phosphate.
are true EXCEPT
a)It is found in
carboxysomes in many
bacteria.
b)It is one of the most
prevalent proteins on
Earth.
c)It consists of small (S)
and large (L) subunits.
d)It catalyzes the addition
of CO2 to xylulose 5
phosphate.
… 2/32
,5/16/25, 6:53 AM MBIO 3401 EXAM 3 | PRINCIPLES OF MICROBIOLOGY EXAM | ALL QUESTIONS AND CORRECT ANSWERS (DETAILED ANS…
How many turns of the d) six
Calvin cycle does it take
to feed one molecule of
glyceraldehyde-3-
phosphate into the
biosynthesis of glucose?
a)One
b)Two
c)Three
d)Six
e) None of the above
Which of the following is b) CO2 cannot be fixed via other mechanisms.
NOT a reason why the
Calvin cycle might have
evolved requiring many
different enzymes
producing many different
metabolic intermediates?
a) Many of the
intermediates are also
used as substrates for
biosynthesis of other
organic compounds.
b) CO2 cannot be fixed via
other mechanisms
c) The energy flow is
broken down into
reactions with near-zero
values of ΔG.
d) The reactions are
relatively easily reversible.
e) None of the above
… 3/32
, 5/16/25, 6:53 AM MBIO 3401 EXAM 3 | PRINCIPLES OF MICROBIOLOGY EXAM | ALL QUESTIONS AND CORRECT ANSWERS (DETAILED ANS…
Why are fatty acids b) they are constructed from repeating units.
suitable for modular
synthesis?
a) They are synthesized in
multiple different cellular
locations.
b) They are constructed
from repeating units.
c) Substrates for synthesis
are not readily available in
the cell.
d) They have multiple,
varied R groups.
Why might organisms alter a) Unsaturated fatty acids are less rigid and maintain
their fatty acid membrane flexibility at lower temperatures.
composition based on
temperature?
a) Unsaturated fatty acids
are less rigid and maintain
membrane flexibility at
lower temperatures.
b) Fatty acids are more
costly to synthesize at
higher temperatures.
c) Fatty acids must be
longer at lower
temperatures to prevent
membrane freezing.
d) Saturated fatty acids
make the membrane more
permeable, allowing
greater solute diffusion at
lower temperatures.
… 4/32
