Photosynthesis UNIT 3 AOS 1 Flashcards
what is a photon?
a packet of light
what is chlorophyll?
the light absorbing green pigment that begins the process of photosynthesis
what is the thylakoid membrane?
the photosynthetic membrane within a chloroplast that contains light gathering pigment molecules and electron transport chains
what is ATP?
A molecule containing three high energy phosphate bonds that acts as the primary energy-transferring molecule in a living organism.
what is ADP?
A molecule containing two high-energy phosphate bonds that may be formed by breaking one of the phosphate bonds in ATP.
what is NADP+?
A compound that accepts one hydrogen atom and two electrons forming NADPH; it is an electron acceptor.
what is NADPH?
A compound that donates one hydrogen aton and two electrons to another molecule, to reform NADP+; it is an electron donor.
what is a photosystem?
A cluster of photosynthetic pigments embedded in a thylakoid membrane of a chloroplast that absorbs light energy.
what is the chemical equation?
6CO2 + 12H2O -> C6H12O6 + 6O2 + 6H2O
what is the word equation?
carbon dioxide + water -> glucose + oxygen + water
what happens in the light dependent stage?
- light hits photosystem 1 and 2
- electrons from chlorophyll get excited an move down the chain of carriers
- water is split to replace the lost electrons
- O2 gas is released as a waste product
- NADPH and ATP are made
what happens in the light independent stage?
- CO2 is fixed and enters the krebs cycle
- NADPH and ATP are converted to NADP+ and ADP to power the chemical reactions in the cycle
- Glucose is made at the end left over electrons are used to make more water
what is the compensation point?
when the amount of carbon dioxide made in cellular respiration is equal the amount of carbon dioxide used up in photosynthesis
inputs of light dependent?
light, water, NADP+, ADP + Pi
inputs of light independent?
ATP, carbon dioxide, NADPH