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31 May 2018

The first carbon dioxide acceptor in C4-plants is

(a) phosphoenol-pyruvate

(b) ribulose 1, 5-diphosphate

(c) oxalo-acetic acid

(d) phosphoglyceric acid.

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Related questions

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?

The complete conversion of a molecule glucose to six molecules of carbon dioxide via glycolysis and the Krebs cycle requires 19 reactions. Put the reactions that are given below in the proper order, beginning with the phosphorylation of glucose to form glucose-6-phosphate and ending with the oxidation of malate to form oxaloacetic acid.

1) 1,3-bisphosphoglycerate + ADP --> 3-phosphoglycerate + ATP
2) fumarate + H2O --> malate
3) isocitrate + NAD+ --> alpha-ketoglutarate + NADH + H+ + CO2
4) phosphoenol pyruvate + ADP --> pyruvate + ATP
5) Succinyl-CoA + GDP + Pi --> succinate + GTP + CoASH
6) glyceraldehyde 3-phosphate + NAD+ + Pi --> 1,3-bisphosphoglycerate + NADH + H+

Thank you for the help!

(31. What is the purpose of cellular respiration/

a. To get O2 into our bodies and to get CO2 out of our bodies

b. To use the energy of sunlight to synthesize sugars

c. To make ATP to power cellular activities d. To hydrolyze ATP

(36. Which of the following accurately describes a distinction between lactic acid fermentation and alcoholic (ethanol) fermentation?

a. Lactic acid fermentation occurs in prokaryotes, whereas alcoholic (ethanol) fermentation occurs in eukaryotes

b. The final electron acceptor in lactic acid fermentation is pyruvate; the final electron acceptor in alcoholic (ethanol) fermentation is acetaldehyde

c. In lactic acid fermentation, NADH is produced by glycolysis; in alcoholic (ethanol) fermentation, NADH is produced by the Krebs cycle

d. In lactic acid fermentation, cell use CO2 in place of oxygen; in alcoholic (ethanol) fermentation, cells use SO4

(37. Which pathway is see in both fermentation and aerobic respiration?

a. Krebs cycle

b. Electron transport

c. Glycolysis d. Pyruvate oxidation

(50. How many molecules of carbon dioxide (CO2) would be produced with 5 turns of the cirtic acid cycle?

a. 2

b. 5

c. 10

d. 12

e. 60

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