Chapter 6 Photosynthesis Flashcards
What is autotrophic nutrition?
Organisms using chemical energy to synthesise large organic molecules from simple inorganic molecules, such as water and CO2
What are organisms that photosynthesise called?
photoautotrophs (producers)
What is the general equation for photosynthesis?
6CO2 + H2O (+energy from photons) —> C6H12O6 + 6O2
What is the compensation point?
When photosynthesis and respiration occur at the same rate so there is no net loss or gain of carbohydrate
Where does the light-dependent stage take place?
In the grana in the thylakoid membrane
Where does the light-independent stage take place?
Stroma
What is a photosynthetic pigment?
Pigment that absorbs specific wavelengths of light and traps the energy associated with light (examples include chlorophyll a, chlorophyll b and carotene), They are used in the light dependent stage and are located in the thylakoid membrane in photosystems.
Where are photosystems located?
Thylakoid membrane
What is the role of oil droplets in a chloroplast?
They act as a reserve of raw materials for the synthesis of new chloroplast membranes
What connects separate granum?
Intergranal lamellae
What holds the photosystems in place?
Proteins embedded in the thylakoid membrane
What does the stroma contain?
Enzymes needed to catalyse reactions of the light-dependent stage, starch grains, oil droplets, small ribosomes and DNA
What colour do chlorophyll a and b appear?
Chlorophyll a: blue-green
Chlorophyll b: yellow-green
What are the stages of the light-dependent stage of photosynthesis?
- light harvesting at photosystems
- photolysis of water
- photophosphorylation - production of ATP in the presence of light
- formation of reduced NADP
What is the equation for photolysis?
2H2O —> 4H+ + 4e- + O2