Bio lab quiz 3 part 2
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- Thought to be earliest organisms
- Use chemical reactions to capture energy
- Transform inorganic carbon into organic carbon
- Competition for chemical resources increased as population grew.
- Precursor to photoautotrophs
- Example: Sulfor-oxidizing bacteria
Evolved to be able to convert the energy in sunlight to usable chemical energy.
- Infinetly renewable and constant
- Decreased competition
Example: plants, bacteria, protists, algae
- Pigments are molecules that absorb light (photons)
- The absorption of these photons excite electrons
- The excited electrons then move down the electron transport chain.
- Each pigment has a characteristic absorption spectrum (the range and efficiency of photons it is capable of absorbing)
- Differnet pigments allow for absorption of light at different wavelength.
Chloryphyll a: the pigment that can actively convert light energy to chemical energy.
Chloyphyll b, carotenoids (xanthophyllis, carotene)
Capture light energy and transfer to chloryphyll a
6CO2 + 12H20 = C6H6O6 + 6H20 + 6O2
H2O molecules are not the same on both sides.
H2O molecules on the left side are split to yield electrons during the light dependent reactions.
H2O molecules on the right side are assembled from hydrogen and oxygen released during the light dependent and independent reactions.
Light Dependent Reactions:
H2O + ADP + P + NADP -->ATP + NADPH + O2
- Fast reaction
- Utilize pigments (capture light to excite electrons)
- Converts solar energy to chemical energy (ATP & NADPH)
- Involves the electron transport chain
- Occurs in thylakoids
Light independent reactions:
- ATP + NADPH + CO2 --> (CH2O) + ADP + P NADP+
- aka Calvin cycle
- Does not require light
- Slower reaction
- Fixes (reduces) CO2 and other compounds into sugars using NADPH and ATP from the light dependent reaction.
- Occurs in STROMA
Light Dependent / Independent Picture:
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