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27 terms

chapter 7

STUDY
PLAY
In which organelle does photosynthesis take place in plant cells?
chloroplast
In an _____ process, photosynthesis _____ carbon, whereas cellular respiration is an _____ process that _____ carbon.
endergonic ... reduces ... exergonic ... oxidizes
Visible light is a small portion of electromagnetic energy that is derived from sunlight. It occurs between _____.
UV radiation and infrared radiation
What purpose is directly served by chlorophyll a during photosynthesis?
It allows for the conversion of energy.
Photosystems consist of a number of light-harvesting pigments. As sunlight strikes these pigments, an electron is donated to the primary electron acceptor. What replaces this flow of electrons?
electrons that are donated as water is split
Which of the following is the correct flow of electrons through the two photosystems in the thylakoid membrane?
P680 P700 NADP+
During photosynthesis, _____ is produced by the light reactions and then consumed by the Calvin cycle.
NADPH
During photosynthesis, six molecules of CO2 are reduced to one molecule of glucose. How many molecules of ATP and NADPH are required to fuel this process?
18 ATP and 12 NADPH
Which gas contributes to both global warming and the deterioration of the ozone layer?
CFCs
Photorespiration is an inefficient process that occurs when plants close their stomata to avoid dehydration in arid climates. C4 and CAM plants have adapted to this situation because _____.
they fix CO2 into a four-carbon compound. This creates a steeper concentration gradient within the mesophyll cells
Which of these equations best summarizes photosynthesis?
6 CO2 + 6 H2O → C6H12O6 + 6 O2
Where does the Calvin cycle occur?
stroma
The light reactions of photosynthesis use _____ and produce _____.
water ... NADPH
Which of these phosphorylates ADP to make ATP?
ATP synthase
_____ releases energy that is used to pump hydrogen ions from the stroma into the thylakoid compartment.
electron transport chain
_____ splits water into 1/2 O2, H+, and e- .
photosystem 2
Energized electrons from ____ enter an electron transport chain and are then used to reduce NADP+.
photosystem 1
Chlorophyll can be found in _____.
photosystem 1& 2
Carbon fixation involves the addition of carbon dioxide to _____.
RuBP
After 3-PGA is phosphorylated, it is reduced by _____.
NADPH
How many carbon dioxide molecules must be added to RuBP to make a single molecule of glucose?
6
In the Calvin cycle, how many ATP molecules are required to regenerate RuBP from five G3P molecules?
3
In C3 plants the conservation of water promotes _____.
photorespiration
In C4 and CAM plants carbon dioxide is fixed in the _____ of mesophyll cells.
cytoplasm
C4 plants differ from C3 and CAM plants in that C4 plants _____.
transfer fixed carbon dioxide to cells in which the Calvin cycle occurs
If you were gardening on a space station, which of these could you eliminate?
soil
Which of the following causes the growth of wasteful side shoots on wheat plants?
fluorescent light