Biochemistry
9th Edition
ISBN: 9781319114671
Author: Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher: W. H. Freeman
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Question
Chapter 22, Problem 15P
Interpretation Introduction
Interpretation:
The problem with the answer of question 14 must be determined.
Concept introduction:
The fatty acids are degraded in a sequential manner, that is two carbon units at the carboxyl end of the molecule are removed in each step. The process of beta-oxidation of fatty acids takes place inside the mitochondria, and it includes the oxidation of beta carbon of the fatty acids.
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In 1956, E. P. Kennedy and S. B. Weiss published their study of membrane lipid phosphatidylcholine (lecithin) synthesis in rat
liver. Their hypothesis was that phosphocholine joined with some cellular component to yield lecithin. In an earlier experiment,
incubating 32 P-labeled phosphocholine at physiological temperature (37 °C) with broken cells from rat liver yielded labeled
lecithin. This became their assay for the enzymes involved in lecithin synthesis.
Determine the optimal pH for this enzyme and characterize the enzyme activity at different pH values.
-O-P-O-CH2-CH₁₂-N(CH3)3
Phosphocholine
H₂C-O-C-R
HC-O-C-R2
+
+
+
Cell fraction + ?
HC-O-P-O-CH₁₂-CH₂-N(CH),
O
Phosphatidylcholine
The researchers then centrifuged the broken cell preparation
to separate the membranes from the soluble proteins. They
tested three preparations: whole extract, membranes, and
soluble proteins. Table 1 summarizes the results.
Table 1: Cell fraction requirement for incorporation of
32p-phosphocholine into…
Researchers isolated an unknown substance, X, from rabbit muscle. They determined its structure from the following
observations and experiments.
(a) Qualitative analysis showed that X was composed entirely of C, H, and O. A weighed sample of X was completely oxidized
and the H2O and CO2 produced were measured. This quantitative analysis revealed that X contained 40.00% C, 6.71% H, and
53.29% O by weight.
(b) The molecular mass of X, as determined by mass spectrometry, was 90.00 atomic mass units (u).
(c) Infrared spectroscopy showed that X contained one double bond.
(d) X dissolved readily in water, and the solution demonstrated optical activity when tested in a polarimeter.
(e) The aqueous solution of X is acidic.
What is the empirical formula of X?
Show work. don't give Ai generated solution....give correct solution
Chapter 22 Solutions
Biochemistry
Ch. 22 - Prob. 1PCh. 22 - Prob. 2PCh. 22 - Prob. 3PCh. 22 - Prob. 4PCh. 22 - Prob. 5PCh. 22 - Prob. 6PCh. 22 - Prob. 7PCh. 22 - Prob. 8PCh. 22 - Prob. 9PCh. 22 - Prob. 10P
Ch. 22 - Prob. 11PCh. 22 - Prob. 12PCh. 22 - Prob. 13PCh. 22 - Prob. 14PCh. 22 - Prob. 15PCh. 22 - Prob. 16PCh. 22 - Prob. 17PCh. 22 - Prob. 18PCh. 22 - Prob. 19PCh. 22 - Prob. 20PCh. 22 - Prob. 21PCh. 22 - Prob. 22PCh. 22 - Prob. 23PCh. 22 - Prob. 24PCh. 22 - Prob. 25PCh. 22 - Prob. 26PCh. 22 - Prob. 27PCh. 22 - Prob. 28PCh. 22 - Prob. 29PCh. 22 - Prob. 30PCh. 22 - Prob. 31PCh. 22 - Prob. 32PCh. 22 - Prob. 33PCh. 22 - Prob. 34PCh. 22 - Prob. 35PCh. 22 - Prob. 36PCh. 22 - Prob. 37PCh. 22 - Prob. 38PCh. 22 - Prob. 39PCh. 22 - Prob. 40PCh. 22 - Prob. 41PCh. 22 - Prob. 42PCh. 22 - Prob. 43PCh. 22 - Prob. 44PCh. 22 - Prob. 45PCh. 22 - Prob. 46PCh. 22 - Prob. 47PCh. 22 - Prob. 48PCh. 22 - Prob. 49PCh. 22 - Prob. 50PCh. 22 - Prob. 51PCh. 22 - Prob. 52PCh. 22 - Prob. 53PCh. 22 - Prob. 54PCh. 22 - Prob. 55PCh. 22 - Prob. 56PCh. 22 - Prob. 57PCh. 22 - Prob. 58PCh. 22 - Prob. 59PCh. 22 - Prob. 60PCh. 22 - Prob. 61PCh. 22 - Prob. 62P
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