Show:
Light-Independent Reaction
Light-Dependent Reaction
Random Questions
Random Questions #2
Vocabulary
100
What is the Calvin cycle?
The second of two major stages in photosynthesis (following the light reactions), involving fixation of atmospheric CO2 and reduction of the fixed carbon into carbohydrate.
100
Which photo system absorbs light best at wavelength of 680 nm?
Photosystem II (can also be called P680)
100
Which of the following does not occur during the Calvin cycle?
release of oxygen
100
Transports electrons from the light reactions to the Calvin cycle.
NADPH is an electron carrier that picks up electrons in the light reactions and releases them in the Calvin cycle. An electron transport chain conveys electrons from one photosystem to the other within the light reactions.
100
Carbon fixation?
adding carbon to organic compounds (used in C3, C4 plants and photosynthetic CAM) (regular jeopardy
200
What is Glyceraldehyde 3-phosphate (G3P)?
A three-carbon carbohydrate that is the direct product of the Calvin cycle; it is also an intermediate in glycolysis.
200
The light reactions of photosynthesis supply the Calvin cycle with
ATP and NADPH.
200
Which process is most directly driven by light energy?
removal of electrons from chlorophyll molecules
200
thylakoid
system of interconnected membranous sacs that separates stroma from other parts of chloroplast. photosystem & light reactions occur within the thylakoid membrane (stacked thylakoids in a column are called grana)
300
What are the three phases of The Calvin cycle?
Carbon Fixation Energy Consumption and Redox Release of G3P; Regeneration of RuBP
300
What connects the two photosystems in the light reactions?
An electron transport chain
300
The light reactions take place in the _________ and the Calvin cycle takes place in the _________.
thylakoids; stroma
300
Which of the following DOES NOT occur during the Calvin cycle? a) release of oxygen b) generation of the CO2 acceptor c) oxidation of NADPH d) consumption of ATP
release of oxygen
300
Carotenoids
Hydrocarbons (C double-bonded to O) that absorb violet & blue-green excessive light energy that would harm chloroplast (absorbs sunlight like chloroplyll0
400
What are C3 plants? (inverse of jeopardy)
A plant that uses the Calvin cycle for the initial steps that incorporate CO2 into organic material, forming a three-carbon compound as the first stable intermediate.
400
At what wavelength does Photo system I best absorb wavelength?
700 nm (photo system aka P700)
400
Describe Carbon Fixation in the Calvin Cycle
Three molecules of carbon dioxide are added to three molecules of a five-carbon sugar abbreviated RuBP. These molecules are then rearranged to form six molecules called 3-PGA, which have three carbons each.
400
What is the chemical equation for photosynthesis?
6CO2 + 6H2O → C6H12O6 + 6O2
400
Primary electron acceptor
captures excited electron from chlorophyll a lies inside reaction center
500
What are C4 Plants?
A plant in which the Calvin cycle is preceded by reactions that incorporate CO2 into a four-carbon compound, the end product of which supplies CO2 for the Calvin cycle.
500
 What two molecules are produced by the light reactions and used to power the Calvin cycle? A. CO2 and O2 B. C6H12O6 and O2 C. C6H12O6 and RuBP D. ATP and NADPH E. G3P and H2O
D. ATP and NADPH
500
What is the cost of photorespiration?
2 NADH and 1 ATP
500
What is the process of generating ATP from ADP and phosphate by means of chemiosmosis?
Photophosphorylation
500
Rubisco
enzyme that catalyzes first step of Calvin cycle- attaching carbon from CO2 to a 5-carbon sugar (RuBP) (similar to acetyl coenyme in cellular respiration)