1-Also growing in Kelsey and Justin’s column are cyanobacteria. One such cyanoba
ID: 13558 • Letter: 1
Question
1-Also growing in Kelsey and Justin’s column are cyanobacteria. One suchcyanobacterium is called Nostoc. Which statement/s accurately describe the
photosynthetic apparatuses / processes of this bacterium?
a. Nostoc contains both photosystem I and photosystem II. These
photosystems contain chlorophyll a.
b. If Nostoc needs to generate ATP but not reducing power, only
Photosystem I will be used.
c. The reaction center chlorophyll of Photosystem II will oxidize water if
Nostoc is using non-cyclic photophosphorylation.
d. Reducing power generated in the complexes of Photosystem II is used to
enable the dark reactions of photosythesis within Nostoc.
e. all of the above
2. After observing his Winogradsky column Justin becomes increasingly curious
about the purple sulfur bacterium, Thiospirillum. He does some reading and finds
that Thiospirillum has only one photosystem that is similar to photosystem II of
cyanobacteria. However, Justin also realizes that there are some important
differences since this is the only photosystem. To which conclusions does Justin
come? [*Mark all that apply.]
a. The single photosystem of Thiospirillum must have a reaction center
bacteriochlorophyll with the capability of oxidizing H2S.
b. The single photosystem of Thiospirillum must be able to produce reducing
power when needed.
c. The single photosystem of Thiospirillum must have a reaction center
chlorophyll with the capability of oxidizing H2O.
d. The single photosystem of Thiospirillum does not absorb light.
3. All of the following are TRUE regarding the Calvin Cycle EXCEPT
a. The Calvin Cycle is overall endergonic.
b. Unlike the TCA Cycle which is amphibolic (primarily catabolic), the
Calvin Cycle is anabolic.
c. During the Calvin Cycle, reducing power is consumed in a reaction which
converts 1,3-bisphosphoglycerate to 3-phosphoglycerate.
d. ATP is synthesized via substrate-level phosphorylation during two steps of
the Calvin cycle.
4. All of the following are precursor metabolites EXCEPT
a. a-ketoglutarate
b. pyruvate
c. dihydroxyacetone phosphate
d. acetyl-CoA
e. All are precursor metabolites
Explanation / Answer
1-Also growing in Kelsey and Justin’s column are cyanobacteria. One such
cyanobacterium is called Nostoc. Which statement/s accurately describe the
photosynthetic apparatuses / processes of this bacterium?
a. Nostoc contains both photosystem I and photosystem II. These
photosystems contain chlorophyll a.
b. If Nostoc needs to generate ATP but not reducing power, only
Photosystem I will be used.
c. The reaction center chlorophyll of Photosystem II will oxidize water if
Nostoc is using non-cyclic photophosphorylation.
d. Reducing power generated in the complexes of Photosystem II is used to
enable the dark reactions of photosythesis within Nostoc.
e. all of the above
2. After observing his Winogradsky column Justin becomes increasingly curious
about the purple sulfur bacterium, Thiospirillum. He does some reading and finds
that Thiospirillum has only one photosystem that is similar to photosystem II of
cyanobacteria. However, Justin also realizes that there are some important
differences since this is the only photosystem. To which conclusions does Justin
come? [*Mark all that apply.]
a. The single photosystem of Thiospirillum must have a reaction center
bacteriochlorophyll with the capability of oxidizing H2S.
b. The single photosystem of Thiospirillum must be able to produce reducing
power when needed.
c. The single photosystem of Thiospirillum must have a reaction center
chlorophyll with the capability of oxidizing H2O.
d. The single photosystem of Thiospirillum does not absorb light.
3. All of the following are TRUE regarding the Calvin Cycle EXCEPT
a. The Calvin Cycle is overall endergonic.
b. Unlike the TCA Cycle which is amphibolic (primarily catabolic), the
Calvin Cycle is anabolic.
c. During the Calvin Cycle, reducing power is consumed in a reaction which
converts 1,3-bisphosphoglycerate to 3-phosphoglycerate.
d. ATP is synthesized via substrate-level phosphorylation during two steps of
the Calvin cycle.
4. All of the following are precursor metabolites EXCEPT
a. a-ketoglutarate
b. pyruvate
c. dihydroxyacetone phosphate
d. acetyl-CoA
e. All are precursor metabolites
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