Download Our Primary Energy Source

Our Primary Energy Source
• What is the primary energy source for life on this
planet?
• The sun!
• What are the two different types of autotrophs?
• Photoautotrophs
– Source of energy = sun
– Source of carbon = carbon dioxide
• Chemoautotrophs
– Source of energy = inorganic chemicals
– Source of carbon = carbon dioxide
Photoautotrophs
An Overview of
Photosynthesis
• What is the photosystem and where is it
found?
• The photosystem is found within the
thylakoid membrane and it contains all
of the photosynthetic pigments.
• What is the reaction center?
• It is an area of the photosystem where
chl a resides
Reaction center
with chl a
What is the chemical equation for photosynthesis?
6CO2 + 6H2O ---> C6H12O6 + 6O2
• How do plants get the light needed for
photosynthesis?
• Pigments in the thylakoid membranes
• How do plants get the water they need
for photosynthesis?
• From their roots.
• How do plants get the carbon dioxide
they need for photosynthesis?
• From their stomata.
NADP+
• NADP+ is an electron carrier, that
combines with 2 electrons and one
hydrogen ion.
• Reduction = receiving an electron
• Oxidation = giving up an electron
• NADP+ becomes reduced into NADPH,
when it receives the electrons
The Two Stages of
Photosynthesis
• What are the two stages of
photosynthesis?
• The light reactions
• The Calvin Cycle
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• What would chloroplasts in the dark
need in order to produce sugar from
carbon dioxide?
• ATP and NADPH