Biology-Chapter 8
The following diagram represents light absorption as a function of wavelength of various pigments. The pigment represented by the dotted line will absorb most strongly light with which of the following wavelengths?
470 nm
Which of the following are parts of a chlorophyll molecule?
A hydrocarbon tail,A porphyrin ring
Photophosphorylation produces__which stores chemical energy that can be used for the Calvin cycle. Carbon fixation also requires reducing power, which is provided by___produced by photosystem I.
ATP ,NADPH
Compared to the C3 pathway, the C4 pathway has an additional cost to a plant, because
ATP is required to convert pyruvate to PEP
Which of the following organisms have only one photosystem?
Anoxygenic bacteria
Why is the Calvin cycle also known as C3 photosynthesis?
Because the first molecule in the cycle has 3 carbon atoms.
avoid water loss by closing their stomata during the day and opening them at night
CAM
How do CAM plants avoid water loss?
CAM plants close their stomata during the day and open them at night.
Chlorophyll___is the main photosynthetic pigment in plants as it converts light energy into chemical energy; chlorophyll___acts as an accessory pigment.
Chlorophyll a, Chlorophyll b.
Which of the following pairs is matched incorrectly?
Chlorophyll b:main photosynthetic pigment in plants.
True or false: The mechanism of ATP synthesis in the ATP synthase of chloroplasts is fundamentally different from the one used in the ATP synthase of mitochondria.
False
Which of the following is made during the light-dependent stages of photosynthesis?
NADPH
The production of one molecule of__from water during photosynthesis requires several thousand chlorophyll molecules.
O2
The primary electron acceptor for the excited electron leaving photosystem II is a___molecule.
Plastoquinone
Which of the following are phases of the Calvin cycle?
Reduction and carbohydrate production,Carbon fixation,Regeneration of ribulose bisphosphate
The following diagram represents light absorption as a function of wavelength of various pigments. Which of the three pigments might reflect a yellow or red color
The pigment represented by the gray line
Typically, it is considered that the net gain of the Calvin cycle is(are) ___molecule(s) of G3P.
Two
Light has properties of both a particle and a wave.
Which of the following statements best describes the properties of light?
The __ diagram describes the energy transitions of electrons as they move through the __ reactions.
Z ; light
A photon of light has properties of both
a particle and a wave.
The ATP needed in the Calvin cycle comes from
both cyclic and noncyclic photophosphorylation
The dotted line on the image shows the absorption spectrum of
chlorophyll b
The light___ reactions of photosynthesis occur on membranes.
dependent
The role of the light-harvesting complex is to
directly absorb photons of light
The ATP synthases of chloroplasts and mitochondria are
evolutionary related
True or false: Glucose is the primary output of the Calvin cycle.
false
The role of the___Unavailable-harvesting complex is to directly absorb photons of light.
light
The process in which electrons from water move through PSII and PSI and ultimately to NADPH is also known as___photophosphorylation.
noncyclic
In chloroplasts, electrons ejected from the photosystems do not return to them, which is known as
noncyclic photophosphorylation.
Anoxygenic bacteria have how many photosystems?
one
In chloroplasts, several dozen of these kinds of molecules help comprise a light harvesting complex:
pigments
Recent studies with the atomic force microscope have shown that PSI and the ATP synthase are not randomly distributed in thylakoid membranes, rather, they seem concentrated
primarily in the connections between grana (the stroma lamellae).
The range and efficiency of photons that a pigment molecule is capable of absorbing constitute its characteristic absorption
spectrum
Reduced quinone is a
strong electron donor.
The function of the b6-f complex is to pump protons into the___space.
thylakoid
A Z diagram illustrates how many electron-energizing steps?
two
Which of the following represent the phases of the Calvin cycle?
(1) carbon fixation; (2) reduction and carbohydrate production; (3) regeneration of ribulose bisphosphate
According to recent studies, where are PSII and the b6-f complexes located?
In the grana and in borders between the grana and the stroma lamellae
Where do the light-dependent reactions of photosynthesis occur in the chloroplast?
In the thylakoid membrane.
A C3 plant
can only fix carbon using the Calvin cycle
The solid gray line on the image shows the absorption spectrum of
carotenoids
The two most important classes of pigments in chloroplasts are chlorophylls and
carotenoids
Green plants utilize___a and b to absorb light energy in photosynthesis.
chlorophyll
In chloroplasts, the light-harvesting complex is composed of a web of___molecules linked together and held tightly in the thylakoid membrane by a matrix of proteins.
chlorophyll
