Biochemistry
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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Chapter 27, Problem 30P
Interpretation Introduction

(a)

Interpretation:

The effect of excess insulin on lipid metabolism should be determined.

Concept introduction:

Insulin is a type of anabolic hormone which is produced and secreted by islets cells of the pancreas. The main function of insulin is to control the blood glucose level in the body. It prevents the high glucose level (hyperglycemia) and low blood glucose level (hypoglycemia).

Interpretation Introduction

(b)

Interpretation:

The effect of insulin on protein metabolism.

Concept introduction:

Insulin is a type of anabolic hormone which is produced and secreted by islets cells of the pancreas. The main function of insulin is to control the blood glucose level in the body. It prevents the high glucose level (hyperglycemia) and low blood glucose level (hypoglycemia).

Interpretation Introduction

(c)

Interpretation:

The biochemical basis for the distended bellies of children suffering from kwashiorkor should be determined.

Concept introduction:

Insulin is a type of anabolic hormone, which is produced and secreted by islets cells of the pancreas. The main function of insulin is to control the blood glucose level in the body. It prevents the high glucose level (hyperglycemia) and low blood glucose level (hypoglycemia).

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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…
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