Inthinking questions Flashcards
The first step in glycolysis is the phosphorylation of glucose.
What does this cause to happen?
Instability in the glucose molecule
Which of the following statements best explains the reason why enzymes increase reaction rates?
The enzyme lowers the activation energy
does Oxygen accept protons in Aeropbic respiration
Yes by making water
what is photolysis
the decomposition or separation of molecules by the action of light.
how do enzymes catalyze reactions
lower activation energy
Competitive and non competitive inhibitors
When you phosphorylate a molecule what happens
it becomes less stable, similar to phosphorylating ADP
Where is ATP synthase in photosynthesis
Stroma
What is action spectrum
A graph showing the rate of photosynthesis at different wavelengths of light and shows which wavelengths of light increase rate of photosynthesis the most
Outline the effects of temperature, light intensity and carbon dioxide concentration on the rate of photosynthesis.
As temperature increases, the rate of photosynthesis increases more and more steeply until the optimum temperature is reached. If temperature keeps increasing above the optimum temperature then photosynthesis starts to decrease very rapidly.
As light intensity increases so does photosynthesis until a certain point. At a high light intensities photosynthesis reaches a plateau and so does not increase any more. At low and medium light intensity the rate of photosynthesis is directly proportional to the light intensity.
As the carbon dioxide concentration increases so does the rate of photosynthesis. There is no photosynthesis at very low levels of carbon dioxide and at high levels the rate reaches a plateau.
How does light intensity affect rate of photosynthesis
Higher light intensity speeds up reactions causing the reactions to speed up
2) temp rises and denaturing can occur furthermore the production of NADPH can accumulate in light dependant reactions
3)Plant cannot absorb CO2 fast enough further slowing down
4) If light intensity is at 0%, aka no light, Light dependant reactions cannot proceed and thus no photosynthesis
effect of CO2 levels on photosynthesis
1) When Co2 is initially added, the rate of photosynthesis is increased
2) after Co2 is too high, accumulation begins and the rate begins to slow down
3) if Co2 levels are 0, no photosynthesis
4) the enzymes responsible for carbon fixation are saturated once too much co2
why does rate of photosyntehsis plateau after a point
all available chlorophyll are saturated with light
3 Stages of Calvin cycle
1) Co2 fixation
2) reduction reaction
3)RUBP regeneration
