BIOC31H3 Lecture : Tutorial.docx

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amaranthgnu11

27 Feb 2012

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Tutorial photorespiration and co2 concentrating mechanisms y found that photosynthetic co2 uptake in most plants (=c3 plants) was inhibited by o2 (even normal atm level of. The inhibitory effect is greater at lower [co2]. y photosynthesis under these inhibitory conditions correlated by extensive glycolate synthesis in leaf. y explanation: co2 fixing enzyme of photosynthetic carbon reduction cycle (calvin cycle) which is rubisco (ribulose. 1,5-biphosphate carboxylase) also displayed oxygen activity. y o2 and co2 both compete for its active site. y the addition of co2 to rubp (via rubisco) yields (2x) 3-pga. The addition of o2 to rubp (via rubisco) yields (1x) 3- Metabolite transfer between these 3 organelles y. 2 transamination rxns in peroxisome are the first point where nitrogen metabolism enters the cycle. (transamination rxn= amino grp is transferred from amino donor- usually a. a. to amino acceptor). 2 glycolate metabolized in peroxisome: a transamination rxn w/ a. a. serine and another w/ a. a. glutamate.

Related Questions

The enzyme Rubisco catalyzes the first step of photosynthetic carbon fixation in plants and algae. Rubisco can use either CO2 or O2 as a substrate; when CO2 is used, the result is a net gain of carbon for the plant. When Rubisco uses O2 as a substrate, there is no net gain of carbon; instead, the plant actually uses extra energy to convert the product of this reaction to a useful molecule. Part 1. With respect to CO2 fixation by Rubisco, what term describes the role of O2? Question 7 options: allosteric inhibitor competitive inhibitor non-competitive inhibitor allosteric activator

A. allosteric inhibitor
	B. competitive inhibitor
	C. non-competitive inhibitor
	D. allosteric activator

blackyellowjacket324

You are a researcher looking at different ways you can utilize plantsâ ability to make its own glucose and replicate it outside of a plant cell. You start by isolating mesophyll cells from the three types of plants: C3, C4, and CAM plants. You want to predict what will happen to the outputs of photosynthesis by changing the different concentration of the inputs to each type of plant.

a) Before you isolate the mesophyll cells, you want to see if there is a difference between C3 and C4 plants if they are grown in increased atmospheric C02. Predict How much of their outputs are going to be produced after 1 month of incubation.

You add a poison that acts as an inhibitor that binds to Rubisco but you donât know what type of inhibitor that it might be.

b) Describe two types of inhibitors that would be involved.

c) What type of experiments could you conduct to discriminate between the two? Explain your experiments.

d) Could Rubisco also be inhibited by allosteric inhibition? Explain how would this work or would not work.

coppercaribou27

You add a poison that acts as an inhibitor that binds to Rubisco but you donât know what type of inhibitor that it might be.

a) Describe two types of inhibitors that would be involved.

b) What type of experiments could you conduct to discriminate between the two? Explain your experiments.

c) Could Rubisco also be inhibited by allosteric inhibition? Explain how would this work or would not work.

tealkoala535

BIOC31H3 Lecture : Tutorial.docx

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