Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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![Chlorophyll, heme, vitamin B12, and a host of other substances are synthesized from porphobilinogen, which is itself formed from the condensation of two molecules of 5-aminolevulinate. The two 5-aminolevulinates are bound to lysine (Lys) residues in the enzyme, one in the
enamine form and the other in the imine form. Condensation is thought to occur via a several step process, one of which is shown below.
ÇO2
ÇO2
CO2
+
NH3
NH3
H
H3N
5-aminolevulinate
(enamine form)
5-aminolevulinate
(imine form)
Porphobilinogen
Draw curved arrows to illustrate the movement of electrons in this step of the reaction.
Arrow-pushing Instructions
CO2
CO2
CO2
CO2
:B
BH*
H-A
H3N
H3Ņ](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fe052c52d-191b-4c56-87c8-13d2ed02903f%2Fd0ba2924-2278-471a-8aff-a8a4a3fc3e3f%2Fzjz3c19_processed.png&w=3840&q=75)
Transcribed Image Text:Chlorophyll, heme, vitamin B12, and a host of other substances are synthesized from porphobilinogen, which is itself formed from the condensation of two molecules of 5-aminolevulinate. The two 5-aminolevulinates are bound to lysine (Lys) residues in the enzyme, one in the
enamine form and the other in the imine form. Condensation is thought to occur via a several step process, one of which is shown below.
ÇO2
ÇO2
CO2
+
NH3
NH3
H
H3N
5-aminolevulinate
(enamine form)
5-aminolevulinate
(imine form)
Porphobilinogen
Draw curved arrows to illustrate the movement of electrons in this step of the reaction.
Arrow-pushing Instructions
CO2
CO2
CO2
CO2
:B
BH*
H-A
H3N
H3Ņ
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