Photosynthesis (Mid 3) Flashcards
Which of the following statements best describes the relationship between photosynthesis and respiration?
a
Photosynthesis occurs only in plants; respiration occurs only in animals.
b
Respiration runs the biochemical pathways of photosynthesis exactly in reverse.
c
Photosynthesis stores energy in complex organic molecules; respiration releases energy from complex organic molecules
d
Photosynthesis is catabolic; respiration is anabolic.
e
ATP molecules are produced in photosynthesis but not in aerobic respiration.
c
Photosynthesis stores energy in complex organic molecules; respiration releases energy from complex organic molecules
how are the light-capturing reactions and the Calvin cycle interdependent on each other?
a
The Calvin cycle accepts the electrons generated by the light-capturing reactions, while the light-capturing reactions regenerate the NADP+ for the Calvin cycle.
b
The Calvin cycle requires the ATP and NADPH produced in the light-capturing reactions, while the inputs to the light-capturing reactions are regenerated by the Calvin cycle.
c
The Calvin cycle generates the CO2 that enters into the light-capturing reactions, while the light-capturing reactions generate the glucose that enters into the Calvin cycle.
d
The light-capturing reactions generate the ATP necessary to power the Calvin cycle, while the Calvin cycle generates that NADPH needed for the light-capturing reactions.
b
The Calvin cycle requires the ATP and NADPH produced in the light-capturing reactions, while the inputs to the light-capturing reactions are regenerated by the Calvin cycle.
True or false: based on the interdependence of the light-capturing reactions and the Calvin cycle, both stages of photosynthesis will very quickly shut down when light is not available.
a
True
b
False
a
True
Blue light has ________ wavelengths and is ________ in energy in comparison with red light
a
longer; higher
b
longer; lower
c
shorter; higher
d
shorter; lower
e
None of the above
c
shorter; higher
As fall progresses in Ohio, you may notice leaves turning colors from their typical green to a bright orange color before they fall off the tree. This color change is due to difference the amount of different pigments in those leaves. What might you deduce from this color change?
a
Chlorophylls likely degrade faster as the trees prepare to lose their leaves, making it so that only the color of the carotenoids is left later in fall
b
Chlorophylls likely are produced in much greater amounts later in the fall than they are during spring or summer
c
Carotenoids likely degrade faster as the trees prepare to lose their leaves, making it so that only the color of the chlorophylls is left later in fall
d
Carotenoids likely are produced in much greater amounts later in the fall than they are during spring or summer
a
Chlorophylls likely degrade faster as the trees prepare to lose their leaves, making it so that only the color of the carotenoids is left later in fall
In a plant cell, where are ATP synthases located?
a
plasma membrane only
b
thylakoid membrane only
c
inner mitochondrial membrane only
d
thylakoid membrane and inner mitochondrial membrane
e
thylakoid membrane and plasma membrane
f
plasma membrane and inner mitochondrial membrane
g
All three membranes
d
thylakoid membrane and inner mitochondrial membrane
Put these in order to correctly describe the flow of energy through photosystem II and the chloroplast electron transport chain (ETC):
Reaction center
Antenna pigments
ETC
Proton gradient
Light
ATP synthase
Light
Antenna pigments
Reaction center
ETC
Proton gradient
ATP synthase
What do you think the difference is between NAD+ (in cellular respiration) and NADP +?
a
Both transport electrons to the electron transport chain (ETC) found on the inner mitochondrial membrane, but NADP+ transfers its electrons to the ETC at a higher energy level.
b
NAD+ functions as an electron carrier, whereas NADP+ does not.
c
NAD+ functions as a free-energy source for cells, whereas NADP+ does not.
d
NADP+ is only found in plants and NAD+ is only found in animals
e
Both function as electron carriers, but NADP+ has a phosphate group and NAD+ does not.
e
Both function as electron carriers, but NADP+ has a phosphate group and NAD+ does not.
Photorespiration: (choose all that apply)
Multiple answers:
Multiple answers are accepted for this question
a
occurs because CO2 and O2 can both bind to rubisco
b
creates a lot of ATP
c
makes photosynthesis less efficient when it occurs
d
is most problematic for water plants and plants in humid environments
e
occurs at a higher rate when O2 concentration is high
e
occurs at a higher rate when O2 concentration is high
c
makes photosynthesis less efficient when it occurs
a
occurs because CO2 and O2 can both bind to rubisco
In comparing C4 plants to CAM plants, which of the following is true?(select all that are true)
a
C4 plants and CAM plants tend to minimize photorespiration, in comparison with other types of plants (i.e. C3 plants)
b
C4 plants and CAM plants are common in dry and hot environments
c
CAM plants only do the Calvin cycle at night
d
C4 plants take in and fix CO2 in different cells than they do the Calvin cycle in
e
All of the above are true
d
C4 plants take in and fix CO2 in different cells than they do the Calvin cycle in
a
C4 plants and CAM plants tend to minimize photorespiration, in comparison with other types of plants (i.e. C3 plants)
b
C4 plants and CAM plants are common in dry and hot environments
What would be the expected effect on plants if the atmospheric CO2 concentration was doubled?
a
C4 plants would have faster growth; C3 plants would be minimally affected.
b
All plants would experience increased rates of photosynthesis.
c
C3 plants would have faster growth; C4 plants would be minimally affected.
d
C3 plants would have faster growth; C4 plants would have slower growth.
e
All plants would experience decreased rates of photosynthesis.
c
C3 plants would have faster growth; C4 plants would be minimally affected.
