Photosynthesis
What is the name of the enzyme involved in carbon fixation?
Rubulose
Carbon Fixation
When 6 carbon compound that is immediately converted into two 3 carbon compounds
Which chemical word equation summarizes the overall reactions of photosynthesis?
carbon dioxide + water = oxygen + sugar
The Calvin cycle reactions of photosynthesis cannot proceed without
the products of light reaction (ATP and NADPH)
The Calvin cycle does not operate in the dark because
- some enzymes of the cycle are inactive in the dark - the cycle depends on ATP and NADPH from light reactions - the stomates close and CO2 becomes unavailable
How many times around the Calvin cycle equal a glucose molecule?
6
How many turns of the Calvin Cycle does it take to produce one glucose molecule?
6 times
What molecules is synthesized as electrons pass between the two photo systems?
ATP
What two products from the light reactions help run the Calvin cycle?
ATP and NADPH
What does the Calvin cycle use to form glucose?
ATP and NADPH from the light reactions
What is the importance of the Calvin cycle in photosynthesis?
ATP and NADPH produced by light reaction are used in the Calvin cycle to reduce carbon dioxide to sugar
The only pigment involved in electron flow since it directly absorbs photons of light is
Chlorophyll A
What forms with NADP+ to create NADPH?
Electrons and H+ ions
The two main products of light reaction are
Glucose and Oxygen
How is ATP produced?
H+ ions diffuse across the thylakoid membrane due to movement of electrons between 2 photosystems.
Water is split during light reactions into ___________.
Hydrogen ions (H+ or protons), electrons, and oxygen gas
Why is it important to regenerate RuBP?
It is essential for carbon fixation
Carbon dioxide combines with _________ to start the Calvin cycle
RUBP
The Calvin cycle occurs in the
Stroma
Why are plants green?
They absorb all visible light, except for green
The light reactions take place in the
Thylakoids
In the light reaction of photosynthesis, light energy is absorbed by
chlorophyll and given off as high energy electrons
The most important result of photosynthesis
converting light energy into chemical energy
hydrogen ion from the thylakoid to the stroma
creates a concentration gradient
In the chloroplast, light energy causes
electrons to flow from water to NADP+
Energy from the electrons are used to pump
hydrogen ion from the thylakoid to the stroma
The light reaction of photosynthesis
include splitting a water molecule into protons, electrons and oxygen
Water energy is split due to _________.
light energy
Give one reason why the Calvin cycle cannot occur in the dark?
needs the source of light for energy
Photosynthesis produces enormous amounts of
oxygen
What is a byproduct of the Calvin cycle?
oxygen
Calvin cycle and light reactions occur
simultaneously
When does the Calvin cycle take place? (along with other reactions)
the day time
Leaves of a plant appear to be green because
the leaves absorb other wavelengths and reflect green
Chlorophyll A
the main light absorbing pigment
Photosynthesis converts
visible light into chemical energy
