Biology 121
Elena Bernick, Ph.D.
 Autotrophs are capable of making their own
carbohydrates for food
 Heterotrophs cannot make their own
carbohydrates for...
 A process by which light energy is converted
to chemical energy in the form of sugar
 Performed by photoautotrophs
 Oc...
The organelle
where
photosynthesis
occurs
Chlorophyll A
Light absorption
spectrum, chlor A
and chlor B
•The pigment responsible
for absorbing the sunlight
which dri...
 6CO2 + 12 H2O + light energy C6H12O6 +
6O2 + 6H2O
 Relies on the excitation and transfer of
electrons
 Occurs in 2 ma...
 Produced by the chemical reactions during
the light reactions
 Capable of giving off LOTS of energy!
 Significant in p...
 Light energy is
‘captured’
 Generates excited
electrons
 Excited electrons
‘captured’ by NADPH
NADPH
 An excited electron carrier
 Carries excited electrons from the thylakoid
membrane (where they are produced) to the
str...
PS2
PS1ATP made here!!!
NADPH made
here!!!!!!
•Photosystems: light energy collectors.
•This light energy is used to make A...
Electron transport chains: pull energy from excited
electrons and use it to make large molecules.
PS2
PS1ATP made here!!!
NADPH made
here!!!!!!
 Excited electrons move through PS2 and then
PS1
 After being sent up to the primary electron
acceptor for photosystem 1...
 The excited electrons flow through
photosystem 2 repeatedly to make lots of
ATP
 Light INdependent
 Sugar formation occurs here!
 Energy given off by excited electrons used to
combine water and carbo...
•Carbon fixation
•3 Phosphoglycerate
reduction
•Regeneration of CO2
receptor
 C3 pathway
 C4 pathway
 CAM pathway
 Photorespiration
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Bio+121+photosynthesis+with+narration

  1. 1. Biology 121 Elena Bernick, Ph.D.
  2. 2.  Autotrophs are capable of making their own carbohydrates for food  Heterotrophs cannot make their own carbohydrates for food and must get them from someone else
  3. 3.  A process by which light energy is converted to chemical energy in the form of sugar  Performed by photoautotrophs  Occurs in the chloroplast
  4. 4. The organelle where photosynthesis occurs
  5. 5. Chlorophyll A Light absorption spectrum, chlor A and chlor B •The pigment responsible for absorbing the sunlight which drives photosynthesis •Two forms, A and B •Found in the chloroplast
  6. 6.  6CO2 + 12 H2O + light energy C6H12O6 + 6O2 + 6H2O  Relies on the excitation and transfer of electrons  Occurs in 2 major stages: the light reactions and dark reactions
  7. 7.  Produced by the chemical reactions during the light reactions  Capable of giving off LOTS of energy!  Significant in producing large molecules like glucose
  8. 8.  Light energy is ‘captured’  Generates excited electrons  Excited electrons ‘captured’ by NADPH NADPH
  9. 9.  An excited electron carrier  Carries excited electrons from the thylakoid membrane (where they are produced) to the stroma (where they are used to make sugar)
  10. 10. PS2 PS1ATP made here!!! NADPH made here!!!!!! •Photosystems: light energy collectors. •This light energy is used to make ATP and excited electrons 
  11. 11. Electron transport chains: pull energy from excited electrons and use it to make large molecules.
  12. 12. PS2 PS1ATP made here!!! NADPH made here!!!!!!
  13. 13.  Excited electrons move through PS2 and then PS1  After being sent up to the primary electron acceptor for photosystem 1, the excited electrons board the NADPH ‘bus’
  14. 14.  The excited electrons flow through photosystem 2 repeatedly to make lots of ATP
  15. 15.  Light INdependent  Sugar formation occurs here!  Energy given off by excited electrons used to combine water and carbon dioxide to form sugars  Occurs in the stroma of the chloroplast
  16. 16. •Carbon fixation •3 Phosphoglycerate reduction •Regeneration of CO2 receptor
  17. 17.  C3 pathway  C4 pathway  CAM pathway  Photorespiration
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