Biochemistry
8th Edition
ISBN: 9781285429106
Author: Campbell, Mary K., FARRELL, Shawn O.
Publisher: Cengage Learning,
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Chapter 21, Problem 53RE
Interpretation Introduction
Interpretation:
The effect of ghrelin on appetite is to be explained.
Concept introduction:
The hormone produced and released by the stomach in small amounts that is also released by the pancreas, brain, and small intestine is termed as ghrelin.
The desire to satisfy the bodily need of energy through food is termed as appetite.
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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 21 Solutions
Biochemistry
Ch. 21 - REFLECT AND APPLY (a) The major energy storage...Ch. 21 - RECALL What is the difference between...Ch. 21 - RECALL How are lipases activated hormonally?Ch. 21 - RECALL What is the metabolic purpose of linking a...Ch. 21 - RECALL Outline the role of carnitine in the...Ch. 21 - RECALL What is the difference between the type of...Ch. 21 - RECALL Draw a six-carbon saturated fatty acid and...Ch. 21 - REFLECT AND APPLY Why does the degradation of...Ch. 21 - REFLECT AND APPLY Given the nature of the hormonal...Ch. 21 - RECALL Compare the energy yields from the...
Ch. 21 - RECALL Which generates more ATPthe processing of...Ch. 21 - MATHEMATICAL Calculate the ATP yield for the...Ch. 21 - REFLECT AND APPLY It is frequently said that...Ch. 21 - RECALL Describe briefly how -oxidation of an...Ch. 21 - RECALL You hear a fellow student say that the...Ch. 21 - RECALL What are the unique enzymes needed to...Ch. 21 - RECALL What are the unique enzymes needed to...Ch. 21 - MATHEMATICAL Calculate the net ATP yield from the...Ch. 21 - MATHEMATICAL Calculate the net ATP yield from...Ch. 21 - MATHEMATICAL Calculate the net ATP yield from...Ch. 21 - REFLECT AND APPLY How many cycles of -oxidation...Ch. 21 - REFLECT AND APPLY It has been stated many times...Ch. 21 - RECALL Under what conditions are ketone bodies...Ch. 21 - RECALL Briefly outline the reactions involved in...Ch. 21 - REFLECT AND APPLY Why might a doctor smell the...Ch. 21 - REFLECT AND APPLY Why might a person who is an...Ch. 21 - REFLECT AND APPLY A friend who is trying to lose...Ch. 21 - RECALL Compare and contrast the pathways of fatty...Ch. 21 - RECALL Outline the steps involved in the...Ch. 21 - RECALL What is the metabolic importance of...Ch. 21 - RECALL In fatty acid degradation, we encounter...Ch. 21 - RECALL How are the two redox reactions of...Ch. 21 - RECALL How is ACP similar to coenzyme A? How is it...Ch. 21 - RECALL What is the purpose of having ACP as a...Ch. 21 - RECALL Why are linoleate and linolenate considered...Ch. 21 - REFLECT AND APPLY Is it possible to convert fatty...Ch. 21 - REFLECT AND APPLY What is the role of citrate in...Ch. 21 - REFLECT AND APPLY In the mitochondrion is a...Ch. 21 - REFLECT AND APPLY In fatty acid synthesis,...Ch. 21 - REFLECT AND APPLY (a) Where in an earlier chapter...Ch. 21 - RECALL What is the source of the glycerol in...Ch. 21 - RECALL What is the activating group used in the...Ch. 21 - RECALL What are the differences between synthesis...Ch. 21 - RECALL How are isoprene units important in...Ch. 21 - RECALL A cholesterol sample is prepared using...Ch. 21 - Prob. 46RECh. 21 - Prob. 47RECh. 21 - Prob. 48RECh. 21 - Prob. 49RECh. 21 - REFLECT AND APPLY A drug that reduces blood...Ch. 21 - RECALL What role does neuropeptide Y play in...Ch. 21 - Prob. 52RECh. 21 - Prob. 53RECh. 21 - Prob. 54RECh. 21 - RECALL What is the connection between insulin and...
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