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Compare and contrast the energy consumption and pro/con of C3 carbon fixation (via Calvin cycle) vs C4 carbon fixation (via C4 pathway+Calvin cycle)

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Collen Von
Collen VonLv2
28 Sep 2019

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Related questions

2. There are two types of plants, C3 and C4. C3 plants use the Calvin Cycle to generate sugar. C4 plants use phosphoenol pyruvate to make malate and oxaloacetate which will eventually be used to make sugar. Both types of plants have stomatas (openings on leaves that can be opened and closed) for CO2 entry. In addition, water is also lost through the stomata. C3 plants are only able to synthesize sugar at relatively high CO2 levels because photosynthesis will stop when CO2 production from the mitochondria equals the use of CO2 in the chloroplasts. C4 plants are able to continue photosynthesis even at low CO2 levels. (1) Why are C4 plants able to survive in hot, dry conditions when C3 plants are not? (2) Plants can develop cancer but it is usually from an infection not from the ionizing rays of the sun. What part of the photosynthesis pathway do you think protects the plant form sun damage?

Why does it take three turns of the Calvin cycle to produce G3P, the initial product of photosynthesis?

a. To fix enough carbon to export one G3P molecule.

b. To fix enough oxygen to export one G3P molecule.

c. To produce RuBisCO as an end product.

d. To produce ATP and NADPH for fixation of G3P.

13.

Carbon fixation in plants refers to _____.

the reaction between any two carbon containing molecules.

the breakdown of glucose.

the synthesis of carbon dioxide.

the reaction between carbon dioxide and RuBP.

14.

The electrons that are excited by light energy in photosystems II and I are eventually used to_____.

breakdown RuBP

convert glucose to carbon dioxide

breakdown starch into glucose

reduce NADP+ to NADPH

15.

The light reaction of photosynthesis occurs in the ______.

thylakoid membranes

stroma

cytoplasm

matrix

16.

The final product of the Calvin cycle is ______.

citrate

G3P (glyceraldehyde 3-phosphate)

lactate

pyruvate

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