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List the three variations of carbon-fixation reactions (C3, C4, and CAM) and write their basic characteristics (locations or times of C4 and C3 pathway in each) with one or two examples for each.

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Nelly Stracke
Nelly StrackeLv2
28 Sep 2019

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Related questions

The process of carbon fixation has been an area of enhanced interest and research in the last decade or so

A. Why is that? Elaborate

B. For C3 plants, provide the following: a summary equation for each of the three stages of the Calvin cycle and then one summary equation for the entire process of the cycle.

C. What is the inefficiency that is inherent in the first stage of rthe Calvin cycle, due to an issue associated with the enzyme rubisco? Explain

D. C4 and CAM plants do not have the inefficnecy. Why not? How do they avoid the inefficiency? Explain?

There are two types of plants C3 and C4 plants. In C3plants, Ribulose bisphosphate can fix carbon as explained in thismodule leading to the formation of 3- Phosphoglycerate andeventually formation of sugar through the Calvin cycle. Ribulosebisphosphate is also able to catalyze the reaction in which oxygenis transformed into glycolate which eventually forms CO2 (a processcalled photorespiration). Therefore, in C3 plants, oxygen andcarbon dioxide compete for RuBP. In C4 plants, carbon dioxideinitially reacts with phosphoenol pyruvate to make malate andoxaloacetate. The products of this reaction are then able to travelto an inner compartment of the leaf that contains RuBP and sugar iseventually made. Since RuBP is contained in an inner compartment,oxygen is not able to react with it.

(1) Why are C4 plants able to continue photosynthesiseven at low CO2 levels.

(2) Would you expect the greenhouseeffect (an increase in CO2 content of the atmosphere) to have agreater effect on C3 or C4 plants? Why?

You are a researcher looking at different ways you can utilize plants’ 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 don’t 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.

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