Chapter 10 - Photosynthesis Flashcards
Chloroplasts are ______ powered by the ___
chemical factories powered by the sun
What part transforms light energy into the chemical energy of ATP and NADPH
The chloroplasts’ thylakoids
The ATP and NADPH will be used to
Synthesize glucose and other molecules that can be used as energy sources
What kind of energy is light
Electromagnetic energy/radiation
Substances that absorb visible light
Pigments (in photosystems)
Why do we see green when we look at a leaf?
Chlorophyll absorbs violet-blue and red light while transmitting and reflecting green light.
What keeps chlorophyll in the membrane?
It’s hydrophobic tail, which interacts with proteins inside of the thylakoid membranes of chloroplasts
What part of chlorophyll absorb light
phosphorin ring
is the head of the molecule
Mg atom center
Chlorophyll A
Key light capturing pigment, participates directly in the light rxns
Chlorophyll B
Work with A - called cartenoids
Absorb light and help release energy as heat
Green colour absorbed by chlorophylls and carotenoids?
NO! which is why we see green, it’s reflected back into our eyes
Photosystem composed of
A rxn centre complex surrounded by several light-harvesting complexes
Rxn centre
Organized association of proteins with a special pair of chlorphyll A molecules
Light harvesting complex
Consists of various pigment molecules (ca,cb or cart) bound to proteins
Citric Acid Cycle: Catabolic or Anabolic
catabolic
(oxidize acetyl CoA and using energy to synthesize ATP
Calvin Cycle
Anabolic
Building carbohydrates from smaller molecules and consuming energy
Carb produced directly from the calvin cycle is
G3P!
after 3 cycles
Carbon fixation
INintial incorporation of CO2 into organic material
How Carbon Fixation happens
Attach one CO2 to RuBP with the enzyme Rubisco
3 molecules of CO2, how many G3P
six….but only one as NET GAIN, other five used to regenerate RUBP
RuBP is for?
CO2 acception
To synthesize one glucose molecule, the Calvin cycle uses molecules of CO2, molecules of ATP, and molecules of NADPH.
6, 18, 12
Explain why the large numbers of ATP and NADPH molecules used during the Calvin cycle are consistent with the high value of glucose as an energy source.
he more potential energy a molecule stores, the more energy and reducing power is required for the formation of that molecule. Glucose is a valuable energy source because it is highly reduced, storing lots of potential energy in its electrons. To reduce CO2 to glucose, much energy and reducing power are required in the form of large numbers of ATP and NADPH molecules, respectively
Explain why a poison that inhibits an enzyme of the Calvin cycle will also inhibit the light reactions.
The light reactions require ADP and NADP+, which would not be formed in sufficient quantities from ATP and NADPH if the Calvin cycle stopped.
