Chapter 7 Questions
Which of the following does NOT occur in the calvin cycle?
ADP is phosphorylated to ATP
Which of the following is produced during noncyclic and cyclic electron flow?
ATP
Chlorophyll absorbs light principally in the ____ wavelengths
blue and violet
Who provided the first experimental evidence that soil alone does not nourish the plant?
Jan Baptista van Helmont
Rubisco can use ____ or CO2 as a substrate
O2
In photosystem 2, energized electrons are transferred from pheophytin directly to:
PQA
Th primary function of ____ is as an anti-oxidant
carotenoids
In the C4 pathway, the enzyme PEP carboxylase:
catalyzes the formation of oxaloacetate
In photophosphorylation, the role of the ATP synthase complex is to provide a channel for protons to flow back into the:
chloroplast stroma
The calvin cycle takes place in the:
chloroplast stroma
Which of the following is a C4 plant?
crabgrass
The ____ complex links photosynthesis 1 and 2
cytochrome b6/f
Which of the following is most likely to occur in a leaf cell of a CAM plant during the day?
decarboxylation of malic acid
Which of the following conditions favor photorespiration?
a hot, dry environment
Which of the following statements about CAM plants is false?
all CAM plants are flowering plants
Xanthophylls and carotenes
are carotenoids
Following photolysis, the resulting protons are released into the ____ contributing to the proton gradient across the ___ membrane
lumen of the thylakoid, thylakoid
Kranz anatomy is characterized by a layer of ____ around a layer of ____
mesophyll cells, bundle-sheath cells
Compared with a C3 plant, a C4 plant
needs more ATP to fix CO2
How many molecule of CO2 are fixed during each turn of the calvin cycle?
one
One of the benefits of photorespiration is removing toxic:
phosphoglycolate
Light is composed of particles called
photons
F.F. Blackman showed that
photosynthesis has a light-dependent stage and a light-independent stage
In the light reactions, the ctochrome b6/f complec receives electrons directly from:
plastoquinol
Which of the following events is NOT associated with photosystem 1?
transfer of electrons from cytochromes to iron-sulfur proteins
C.B. Neil's experiments provided evidence that water, not carbon dioxide, was the source of the oxygen in photosynthesis
true
In photosystem 2, pheophytin passes an electron directly to plastoquinone
true
One of the benefits of photorespiration is to remove phosphoglycolate from the plant
true
Phycobilins are water-soluble accessory pigments found in cyanobacteria and red algae
true
Rubisco can use either O2 or CO2 as a substrate
true
Some CAM plants can keep their stomata closed night and day
true
The ATP and NADH generated by the light reactions are used in the calvin cycle
true
The cytochrom b6/f complex links photosystems 2 and 1
true
The light-harvesting complex contains does not contain a reaction center
true
The photolysis of water occurs in conjunction with photosystem 2 but not photosystem 1
true
Under extremely dry conditions, CAM plants outcompete C3 and C4 plants
true
the leaf anatomy of C4 plants provide a spatial separation between the C4 pathway and the calvin cycle
true
Compared with C3 plants, C4 plants:
use nitrogen more efficiently
In CAM plants, malate forms as the end product of CO2 fixation in the dark is restored as malic acid in the:
vacuole
The O2 evolved in photosynthesis comes from
water
Which of the following is not considered a CAM plant?
wheat
Accessory pigments are directly involved in the energy-transduction processes of photosynthesis
false
All photosynthetic eukaryotes contain both chlorophylls a and b
false
An action spectrum can be used to demonstrate the relative effectiveness of different wavelengths of light for photosynthesis
false
At the reaction center of photosystem 2 is P700
false
C3-C4 intermediates provide evidence for the evolution of C3 plants from C4 ancestors
false
Chlorophyll absorbs light principally in the green wavelength
false
In the process of cyclic photophosphorylation, both ATP and NADH are produced
false
Photorespiration is an energetically wasteful process that seldom occurs in nature
false
Protons flow through the ATP synthesis from the stroma into the thylakoid lumen
false
The concentration of CO2 in the Earth's atmosphere is approximately 3%
false
the energy of a photon of light is directly proportional to its wavelength
false
The energy-transduction reactions of photosynthesis are also called the ___ reactions
light
The role of Rubisco is to catalyze the conversion of:
CO2 to an unstable six-carbon compound
Which pigment occurs in all photosynthetic eukaryotes?
Chlorophyll a
In contrast to photosystem 1, photosystem 2 is located primarily:
in grana thylakoids
An action spectrum is different from an absorption spectrum in that an action spectrum:
is the relative effectiveness of different wavelengths for a specific process
Which of the following statements about an antenna complex is false?
it converts light energy into chemical energy
Which of the following statements concerning ferredoxin is false?
it is found in the chloroplast grana
Which of the following statements about the calvin cycle is false?
it uses ATP from noncyclic, but not cyclic, photophosphorylation
Which of the following statements about photorespiration is false?
it yields ATP but not NADH
Suaeda aralocaspica is different from many other C4 plants because it:
lacks Kranz anatomy
The light-harvesting complex is different from a photosystem in that the light-harvesting complex:
lacks a reaction center
In the antenna complex, light energy is transferred from one pigment molecule to another by:
resonance energy transfer
Carbon dioxide is "fixed" by bonding to:
ribulose 1,5-biphosphate
Most of the glyceraldehyde 3-phosphate not exported to the cytosol is converted to _____ and stored in the chloroplasts
starch
The malate or aspartate produced in the C4 pathway moves next into:
the bundle-sheath cells
Which of the following is the very next event that occurs when a chlorophyll molecule absorbs light?
the electron is boosted to an excited state
Which of the following statements about the electromagnetic spectrum is false?
the longer the wavelength of light, the more energy it has
During cyclic electron flow, electrons are transferred directly from P700 to A0 to:
the photosynthetic electron transport chain