Ap Bio Photosynthesis
Which of these is not most closely associated with the process of electron transport?
the pigment complex in the membranes of the thylakoids
What is the term for the structure labeled "a"?
thylakoid
Which statement is NOT true about photosystems?
Photosystem I passes electrons on to PSII
When the stomata in a leaf close, all of the following occur EXCEPT
sugars are made at the same rate as when the stomata were open
What is the ultimate source of energy?
sun
To what does the term stroma refer?
the central fluid-filled space of the chloroplast
The first event in the Calvin cycle is the attachment of carbon dioxide to the five-carbon RuBP molecule, which
All of the choices are correct
Which statement is NOT true about C3 and C4 plants?
C3 plants make glucose in the bundle sheath cells
What is not true of chlorophyll and other accessory pigments in plants?
Chlorophyll provides the enzymes needed to produce carbohydrates.
Which is NOT true about photosynthesis?
More carbohydrate is produced during cyclic photophosphorylation than during noncyclic photophosphorylation
Although it is not possible to be exact about when cyanobacteria first appeared on earth, most scientists agree that about two billion years ago, they expanded rapidly and raised the oxygen in the earth's atmosphere to present levels in about 500 million years. This appearance of oxygen and the beginning of aerobic life was made possible by the appearance of
Photosystem II
If the Calvin cycle uses the three molecules of CO2 to produce six molecules of G3P, but only one G3P molecule is used to form a carbohydrate molecule, what happens to the other carbons that were taken in?
The other five G3P molecules are used to regenerate mor RuBP.
All of the following are true concerning photosynthetic pigments EXCEPT
They all reflect and absorb light at the same wavelengths.
All of the following are true concerning C4 plants EXCEPT
They only absorb and fix CO2 during the night
Why are plants green?
They reflect green wavelengths of light.
Light that is visible to humans occupies what part of the electromagnetic spectrum?
a small portion in the middle
To what does the term grana refer?
a stack of thylakoid membrane structures
Which of the following is an example of a CAM plant?
cactus
What part of photosynthesis is labeled "d"?
calvin cycle
Which is the most closely associated with the Calvin cycle?
carbon dioxide fixation
Which of these is NOT a major photosynthetic pigment in plants?
chlorophyll c
When an electron has been excited to a higher energy state, it can then drop back to the original level, re-emitting the light as fluorescence. When chlorophyll is extracted in solution, and a bright red or blue light is shown on it, the chlorophyll fluoresces brightly. However, when the chlorophyll is packaged inside chloroplasts and the red or blue light is turned on, there is no fluorescence. This most likely indicated that
excited electrons are transferred to electron acceptors in the chloroplast.
The end product of the Calvin cycle is:
glyceraldehyde-3-phosphate (G3P)
What is the term for the structure labeled "e"?
granum
The term "chloroplast" is derived in part from the Greek root that means
green
Which statement is NOT true about the cyclic electron pathway
it produces NADPH
Which statement is NOT true about the noncyclic electron pathway?
it produces carbohydrates through carbon dioxide fixation
The action spectrum of photosynthesis shows a high light absorption for violet/blue and orange/red and a low absorption for green/yellow. If we were to set up an experiment where narrow bands of unicolored light were shown on an aquatic plant such as Elodea, and we counted the number of bubbles of oxygen produced as an indicator of photosynthetic rate, how would the graph appear?
just like the action spectrum with peaks at violet/blue and orange/red and a trough at yellow/green.
The Calvin cycle requires all of the following except____to occur.
light
What part of photosynthesis is labeled "b"?
light reactions
Protons (H+) ions accumulate in the thylakoid space during electron transport between PS II and I. The excess of protons in the thylakoid space:
moves from the thylakoid space to the stroma through an ATP synthase channel that generates ATP
G3P (glyceraldehyde 3 phosphate) is used by plants for all of the following EXCEPT the formation of
oxygen
What are the products of photosynthesis?
oxygen and carbohydrate
Reduced carbon dioxide is one of the end products shown in the diagram. The other end product, labeled "b" must be
oxygen gas
What organisms are capable of photosynthesis?
plants, algae, and some bacteria
Photorespiration is a form of:
release of carbon dioxide in C3 plants
The major enzyme that catalyzes the reduction of carbon dioxide is called
ribulose biphosphate carboxylase (rubisco)
Water vapor exits and CO2 enters a leaf through
stomata
What is the term for the structure labeled "c"?
stroma
