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Photosynthesis Review
Honors Biology
Organisms that can synthesize their own food from inorganic
materials are called_____.
Autotrophs
All ______ rely on autotrophs for food, since autotrophs are the
producers of the food web.
Heterotrophs
The electromagnetic spectrum ranges from gamma radiation to
_______ waves.
Radio
On the visible spectrum, energy content of light is greatest for
______.
Violet light
What two things must go into the light reactions?
Water, Light
The color _____ has the shortest wavelength.
Violet
The color _____ has the lowest energy.
Red
Which colors are most useful in photosynthesis?
Red, violet, and blue
What type of wavelengths do high-energy photons have?
Short wavelengths
Where on the electromagnetic spectrum is visible light found?
In a small portion in the middle of the spectrum. Ranging from about
400 nm- 750 nm
Which of these phosphorylates ADP to make ATP? What is it called?
E- ATP Synthase
_____ releases energy that is used to create the H+ gradient in the thylakoid. What is it called?
B- Electron transport chain
Water is split into oxygen and H+ by ____. What is it called?
A- Photosystem II
Electrons leaving ___ will be used to reduce NADP+. Name?
C- Photosystem I
Where on this diagram would chlorophyll be found?
A and C- The Photosystems
What is D?
Thylakoid space or compartment.
What limits the progress of the Calvin cycle?
Carbon dioxide, light, temperature (enzymes!).
Carbon fixation involves adding carbon dioxide to ____.
RuBP
After PGA is phosphorylated, it is reduced by ______.
NADPH
How many carbon dioxide molecules are needed to make
one molecule of glucose?
6
How many ATP are required to regenerate RuBP from PGAL?
3
How many ATP are necessary to phosphorylate PGA?
6 ATP
NADPH and ATP are used in the light _________ reactions of
photosynthesis.
Independent (Calvin Cycle)
Water is split and oxygen is released in which reactions of
photosynthesis?
Light-dependent reactions
What molecule is the oxygen formed from during
photosynthesis?
Water
During chemiosmosis, the H+ concentration is higher in the
____ of the chloroplast.
Thylakoid space.
During chemiosmosis hydrogen ions flow _____ their concentration gradient through _____________ in
the thylakoid membrane.
Down; ATP synthase
In the Calvin cycle, carbon dioxide is (oxidized/reduced) to
form PGAL.
Reduced
Five molecules of PGAL are used to re-form _____ molecules of RuBP.
3
Water vapor exits and carbon dioxide enters through the ___ in
the leaf.
Stomata.
When photons hit the photosystems electrons from ____ molecules are excited.
Chlorophyll
To make one molecule of glucose, how many ATP are
necessary?
18 ATP
How many carbons does a molecule of RuBP have?
5
Carbon fixation occurs in the ___ of the chloroplast.
Stroma
Why is light necessary in photosynthesis?
It energizes the electrons.
What is the equation for photosynthesis?
6CO2 + 6H2O + light energy C6H12O6 + 6O2