The carrier of the “two carbon units” used to biosynthesize a fatty acid has to be identified. Concept introduction: Lipogenesis is the pathway for the generation of fatty acid from acetyl CoA. There is a cyclic process that occurs in the enzyme fatty acid synthase. It is a multienzyme complex that ties the reaction responsible for the synthesis of fatty acid. A cyclic process occurs in the enzyme fatty acid synthase. The one turn of this cyclic process constitutes four reactions. The various intermediates formed in the process are associated with a carrier protein known as ACP. The reactions associated with the chain elongation process for the synthesis of fatty acid occurs in the cell cytosol.

Question

(a) Show that the lattice energies are inversely proportional to the distance between ions in MX (M = alkali metal, X = halide ions) by plotting the lattice energies of KF, KCl, and KI against the internuclear distances, dMX. The lattice energies of KF, KCl, and KI are 826, 717, and 645 kJ/mol, respectively. Does the correlation obtained correlate well? You will need to use a standard graphing program to construct the graph (such as a spreadsheet program). It will generate an equation for the line and calculate a correlation coefficient. (b) Estimate the lattice energy of KBr from your graph. (c) Find an experimental value for the lattice energy of KBr in the literature, and compare this value with the one calculated in (b). Do they agree?

Answer 1

Question

Chapter 14.7, Problem 6QQ

Interpretation Introduction

Interpretation:

The carrier of the “two carbon units” used to biosynthesize a fatty acid has to be identified.

Concept introduction:

Lipogenesis is the pathway for the generation of fatty acid from acetyl CoA. There is a cyclic process that occurs in the enzyme fatty acid synthase. It is a multienzyme complex that ties the reaction responsible for the synthesis of fatty acid.

A cyclic process occurs in the enzyme fatty acid synthase. The one turn of this cyclic process constitutes four reactions. The various intermediates formed in the process are associated with a carrier protein known as ACP. The reactions associated with the chain elongation process for the synthesis of fatty acid occurs in the cell cytosol.

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(a) Show that the lattice energies are inversely proportional to the distance between ions in MX (M = alkali metal, X = halide ions) by plotting the lattice energies of KF, KCl, and KI against the internuclear distances, dMX. The lattice energies of KF, KCl, and KI are 826, 717, and 645 kJ/mol, respectively. Does the correlation obtained correlate well? You will need to use a standard graphing program to construct the graph (such as a spreadsheet program). It will generate an equation for the line and calculate a correlation coefficient. (b) Estimate the lattice energy of KBr from your graph. (c) Find an experimental value for the lattice energy of KBr in the literature, and compare this value with the one calculated in (b). Do they agree?

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