Unit 3: Cell Energetics #2 Flashcards
Where did photosynthesis first evolve?
Prokaryotic organisms
What are cyanobacteria?
Early organisms capable of photosynthesis (they oxygenated the early Earth)
Where does photosynthesis happen?
In the mesophyll layer of the leaves in the chloroplast in those cells
What are stomata?
Pores in leaves that allow Co2 and o2 out
What are redox reactions?
Reaction involving transfer of electrons from one reactant to another (reduction and oxidation)
When light interacts with matter it can be..
reflected, transmitted, or absorbed
What is the reaction center in the phosystems?
A complex of proteins associated with chlorophyll a and an electron acceptor
What are the three types of plants we need to know?
C3, C4, and CAM
What is the problem with C3 plants/
On hot days plants close their stomata to stop water from evaporation which causes less Co2 to be present and more o2, which leads to photo respiration which is a wasteful process in which co2 is produced from o2 (bad for plant) (ex. trees)
C4 plants
they use two different cells to solve the c3 plants issue. stomata are partially closed and the co2 is fixed into a intermediate molecule and transferred to bundle sheath cells to do the calvin cycle (ex corn, grasses, sugercane)
Cam plants
Open stomata at night and close during the day. Co2 enters at night and is stored, and during the day the light reactions occur and the co2 is used in the calvin cycle. (ex. pinapple)
