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47 terms

BIO 109 - Ch 7 Photosynthesis

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