Photosynthesis - Learning outcomes/ questions Flashcards
Light energy is absorbed by what?
by photosynthetic pigments to generate ATP and for photolysis.
Light energy not absorbed is what?
transmitted or reflected.
Carotenoids extend what?
the range of wavelengths absorbed and pass the energy to chlorophyll for photosynthesis.
Each pigment absorbs what?
a different range of wavelengths of light.
Absorbed light does what?
excites electrons in the pigment molecule.
Transfer of these electrons through the electron transport chain releases what?
energy to generate ATP by ATP synthase.
Energy is also used for what?
photolysis, in which water is split into oxygen, which is evolved, and hydrogen, which is transferred to the coenzyme NADP.
In the carbon fixation stage (Calvin cycle), the enzyme RuBisCO fixes carbon dioxide how?
by attaching it to ribulose bisphosphate (RuBP).
3PG produced is phosphorylated by ATP and combined with what?
hydrogen from NADPH to form G3P.
G3P is used to regenerate what?
RuBP and for the synthesis of glucose.
Glucose may be used as a what?
respiratory substrate, synthesised into starch or cellulose or passed to other biosynthetic pathways.
These biosynthetic pathways can lead to what?
the formation of a variety of metabolites such as DNA, protein and fat.
