Photosynthesis Vocab Quiz # 2
Terms in this set (19)
The location of the first light driven chemical reaction of photosynthesis.
pigments in photosystem that capture photon energy and funnel it to reaction center
Photosystem I (PS I)
A light-capturing unit in a chloroplast's thylakoid membrane or in the membrane of some prokaryotes; it has two molecules of P700 chlorophyll a at its reaction center.
Photosystem II (PS II)
One of two light-capturing units in a chloroplast's thylakoid membrane or in the membrane of some prokaryotes; it has two molecules of P680 chlorophyll a at its reaction center.
Reaction center chlorophyll in the photosystem II.
Reaction center cholophyll in the photosystem I.
The process of generating ATP from ADP and phosphate by means of a proton-motive force generated by the thylakoid membrane of the chloroplast during the light reactions of photosynthesis.
In the thylakoid membranes of a chloroplast during light-dependant reactions, two molecules of water are split to form oxygen, hydrogen ions, and electrons.
An electron carrier involved in photosynthesis. Light drives electrons from chlorophyll to NADP+, forming NADPH, which provides the high-energy electrons for the reduction of carbon dioxide to sugar in the Calvin cycle.
The set of light-dependent reactions of the two plant photosystems, in which excited electrons are shuttled between the two photosystems producing a proton gradient that is used for the chemiosmotic synthesis of ATP. The electrons are used to reduce NADP to NADPH. Lost electrons are replaced by the oxidation of water producing O2.
The synthesis of ATP during photosynthesis, coupled to the cyclic passage of electrons to and from P700, the specialized form of chlorophyll a which is involved in photosystem I, using a series of carrier molecules.
The initial incorporation of carbon into organic compounds.
Ribulose bisphosphate (RuBP)
the five-carbon molecule that reacts with CO2 in the Calvin cycle
Also known as the Calvin cycle, it is the light independent step of photosynthesis in which carbon dioxide is used to produce sugars.
A metabolic pathway that consumes oxygen, releases carbon dioxide, generates no ATP, and decreases photosynthetic output; generally occurs on hot, dry, bright days, when stomata close and the oxygen concentration in the leaf exceeds that of carbon dioxide.
compound used for carbon fixation within CAM photosynthesis
An enzyme that adds CO2 to phosphoenolpyruvate (PEP) to form oxaloacetate in C4 plants. It acts prior to photosynthesis.
Alternative pathway enables certain plants to fix CO2 into four-carbon compounds.
CAM (Crassulacean Acid Metabolism) photosynthesis
plants close their stomata during the day, collect CO2 at night, and store the CO2 in the form of acids until it is needed during the day for photosynthesis