AP Bio Chapter 9 Photosynthesis Part 4 Flashcards
What type of photosynthesis do normal plants do
C3
What are the products of light reactions
NADPH+ and ATP
What does rubisco grab instead of CO2 in dark reactions and what happens
Oxygen, then uses ATP and doesn’t produce a sugar
Where does Calvin cycle occur
In stroma
Rubisco evolved in what conditions and what occurred as a result
Conditions of low oxygen gas concentration, therefore the active site has a high affinity for oxygen gas. The rubisco grabs o instead of CO2, then uses ATP and doesn’t make a sugar
Photorespiration
The metabolic pathway that occurs when rubisco incorporates oxygen instead of CO2 into RuBp
Photorespiration can be stated informally as ____________________
A metabolic dead end, uses ATP but produces no sugar, best if avoided.
How can a plant still be successful in dark reactions
If it keeps it’s stomates open
How are c3 different
No adaptations for minimizing photorespiration
How are c4 leaves different
They use a different enzyme for carbon fixation
Carbon fixation
Rubisco sticks CO2 to another molecule (forms a chemical bond) which makes the gas a solid
What is rubisco supposed to do
Carbon fixation of CO2
How do cam plants respond to photorespiration
Close stomata during the day, open at night so Carbon fixation takes place, when it does this can be utilized during the day.
Cam plants use what type of separation
Temporal separation
Why does carbon fixation occur in the evening of cam plants
When open stomates will not lead to desiccation
Where is the CO2 stored in cam plants
An organic acid
During the day in cam plants what is used
The stored organic acid to supply the Calvin cycle with carbon dioxide
