C1: Photosynthesis (Ch. 3) Flashcards
Class 1
what is carbon fixation?
a process where carbon dioxide is incorporated into more complex organic molecules
what 3 types of organisms perform photosynthesis?
- which of these 3 are considered algae?
- cyanobacteria (prokaryotes)
- some protists (algae, eukaryotes)
- plants (eukaryotes)
- 1 and 2
where does photosynthesis occur in plants?
chloroplast
what structures of the chloroplast are important to know?
- what is the thylakoid used for?
- what is the stroma used for?
granum (stack), thylokoid (individual thingy within the granum), lumen (makeup of thylokoid)
- light dependent rxns
- light independent rxns
where do light dependent rxns occur?
- what is the purpose of them?
- what are the reactants?
- products? what is the waste product here?
- what drives these rxns?
- thylakoid mems
- convert light energy to chemical energy
- sunlight, water, ADP, NADP+
- O2, ATP, NADPH
- O2 is the waste product
- photosystem 1 and 2
what does photosystem 2 do?
absorbs light and causes the electrons in chlorophyll to become excited to a higher energy level and captured by the primary electron acceptor
where do light independent rxns occur?
- what are they aka?
- what is the purpose of them?
- what are the reactants?
- products?
- what enzyme catalyzes this rxn?
- chloroplast stroma
- calvin cycle
- use ATP and NADPH to build organic molecules from CO2
- CO2, ATP, NADPH
- sugar, ADP, NADP+, water`
- rubisco
what is the 1st step in light independent rxns?
- what is the final product?
- what are the intermediate molecules?
to transfer 3 CO2 to 3 5C ribose biphosphate
- glyceraldehyde- 3- phosphate
- 1,3 biphosphoglycerate and 3- phosphoglycerate
what is electron flow?
provides the proton gradient that drives phosphorylation of ADP to ATP
when comparing/ contrasting cellular respiration and photosynthesis, answer the following questions:
- what is the terminal electron acceptor in both of these processes?
- do the krebs cycle and cyclic electron flow exist within both processes?
- what is ATP generated by in both of these processes?
- oxygen in the ETC for cellular respiration, NADP+ in photosynthesis
- no, krebs cycle exists for cell respiration and cyclic electron flow exists in photosynthesis
- ATP synthase in both
what are plastids?
- what are some specific functions of plastids?
- what is an example of a plastid?
small organelles found in plant cells which can produce energy for the cell
- lipid synthesis, amino acid synthesis, etc.
- chloroplasts
what are porphyins?
contain a tetrapyrrole ring found in heme proteins and chlorophyll
