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Chapter 29: Q29-2P (page 976)

PROBLEM 29-2Write the equations for the remaining passages of the oxidation pathway following those shown in Figure 29-4.

Short Answer

Expert verified

Theequations for the remaining passages of the oxidation pathwayis given as follows,

CapryloylcoA鈫�Hexanoyl coA鈫�Butyryl coA鈫�2 Acetyl coA

Step by step solution

01

Introduction to the Concept

The 尾-oxidation route catabolizes myristic acid, causing the carbon chain to degrade in stages. The following is the order of events:

02

Solution Explanation

The14-carbon myristoyl COA is converted to the 12-carbon lauroyl COA plus acetyl COA in passage 1, the 10-carbon caproyl COA plus acetyl COA in passage 2, the caproyl COA to the 8-carbon caproyl COA in passage 3, and so on. Because the precursor comprises four carbons, the final passage yields two molecules of acetyl COA.

After six passages, the 尾- oxidationprocess catabolizes the 14-carbon myristic acid, yielding seven molecules of acetyl COA.

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Most popular questions from this chapter

Lactate, a product of glucose catabolism in oxygen-starved muscles, can be converted into pyruvate by oxidation. What coenzyme do you think is needed? Write the equation in the normal biochemical format using a curved arrow.

The initial reaction in Problem 29-52, conversion of two molecules of acetyl CoA to one molecule of acetoacetyl CoA, is a Claisen reaction. Assuming that there is a base present, show the mechanism of the reaction.

The primary fate of acetyl CoA under normal metabolic conditions is degradation in the citric acid cycle to yield CO2. When the body is stressed by prolonged starvation, however, acetyl CoA is converted into compounds called ketone bodies, which can be used by the brain as a temporary fuel. Fill in the missing information indicated by the four question marks in the following biochemical pathway for the synthesis of ketone bodies from acetyl CoA:

What 伪-keto acid is formed on transamination of leucine?

What amino acid sequence is coded for by the following DNA coding strand (sense strand)?

(5')CTT-CGA-CCA-GAC-AGC-TTT(3')
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