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48 terms

BIO TEST CH 7

STUDY
PLAY
The summary equation for photosynthesis is
6CO2+6H2O+sunlight --> C6H12O6+6O2
Which of the following statements regarding photosynthesis and carbon dioxide is false?
Burning wood contributes more to acid rain than burning fossil fuels
What is the name given to organisms that can make their own food and the food for the biosphere?
producers
Autotrophs that utilize light as their energy source are
photoautotrophs
In most green plants, chloroplasts are
concentrated in a zone of leaf tissue called the mesophyll
CO2 enters and O2 escapes from a leaf via
stomata
In the chloroplast, sugars are made in a compartment that is filled with a thick fluid called the
stroma
Chloroplasts contain disklike membranous sacs arranged in stacks called
grana
Where is chlorophyll found in a plant cell?
thylakoid membranes
The oxygen released into the air as a product of photosynthesis comes from
water
Which of the following statements concerning the role of redox reactions in photosynthesis and cellular respiration is true?
In photosynthesis, carbon dioxide is reduced to form sugar, while in respiration, sugar is oxidized to form carbon dioxide.
What is the source of energy that provides the boost for electrons during photosynthesis?
light
The light reactions occur in the ________, while the Calvin cycle occurs in the __________.
thylakoid membranes... stroma
Which of the following are produced during the light reactions of photosynthesis?
ATP, NADPH, O2
Which of the following are produced during the Calvin cycle?
glucose, ADP, NADP+
Carbon fixation
occurs when carbon and oxygen from CO2 are incorporated into an organic molecule
Sunlight is a type of _____ energy
electromagnetic
Why are most plants green?
Chlorophyll a reflects green light.
Which of the following colors contributes the least energy to photosynthesis?
green
Plant cells are protected from the harmful effects of oxygen radicals with
carotenoids
A packet of light energy is called a
photon
Which of the following statements about the absorption of photons by pigment molecules is true?
The release of energy by the excited electron can be as heat, light or fluorescence
Which of the following photosynthetic pigments can be found at the photosystem reaction center?
chlorophyll a
How do the reaction centers of photosystem I and II differ?
Each preferentially absorbs slightly different wavelengths of light
The energy that excites P680 and P700 is supplied by
photons
The electron transport chains of the light reactions
shuttle electrons along in a series of redox reactions
As a result of the cascade of electrons down the electron transport chains of the light reactions,
NADP+ is reduced to NADPH.
The electrons lost from the reaction center of photosystem I are replaced by electrons from
the bottom of the electron transport chain
The electrons lost from the reaction center of photosystem II are replaced by electrons from
H2O
Photophosphorylation differs from oxidative phosphorylation in that
the final electron acceptor is NADP+ and not oxygen.
In photophosphorylation, energy from electron flow is used to transport ______ from the _______ to the thylakoid compartment, generating a concentration gradient of _____.
H+... stroma...H+
Mitochondria transfer _________ energy from ___________ to ATP; chloroplasts transform ______ energy into the chemical energy of ATP.
chemical... food... light
Photosynthetic organisms derive their carbon from
carbon dioxide
To produce one glucose, the Calvin cycle needs to be run through ______ time(s).
six
The Calvin cycle constructs ________, an energy-rich molecules that a plant cell can then use to make glucose or other organic molecules.
G3P
The ultimate source of all the food we eat and the oxygen we breathe is
photosynthesis
Plants use sugars as
a fuel for cellular respiration and a starting material for making other organic molecules
Plant cells
have mitochondria and chloroplasts
The greenhouse effect is
reduced by photosynthesis, which removes carbon dioxide from the atmosphere
Which of the following statements about the greenhouse effect is true?
The greenhouse effect is exacerbated by the use of fossil fuels
Ozone
protects Earth from UV radiation
Ozone consists of _______ oxygen atom(s).
three
Which of the following has been a major source of ozone destruction over the past 50 years?
chlorofluorocarbons
In this drawing of a chloroplast, which structure represents the thylakoid membrane?
structure C
According to this figure, how do H+ ions make their way from the stroma to the thylakoid interior?
through an electron transport chain molecule
Based on your knowledge of the process of photosynthesis, the plant in the container placed under red light would probably
absorb more CO2 than the plants under the green light
Carbon dioxide absorption is an appropriate indicator of photosynthesis because
CO2 is needed to produce sugars in the Calvin cycle.
Refer back to numbers 48&49
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