The mechanism for conversion of carbon dioxide to bicarbonate ion in presence of carbonic anhydrase has to be proposed. Concept introduction: Enzyme is a protein that is a biological catalyst. The reactant in a reaction catalyzed by the enzyme is called substrate. In the enzyme, a pocket like cleft is present called active site where it binds the substrate. Some amino acid chains in the enzyme act as base, acid and nucleophilic catalyst. Many of the enzymes contain metal ions at the active site which acts as catalyst. Acid Catalyst helps in increasing the rate of a particular reaction by the donation of a proton to substrate. Base Catalyst helps in increasing the rate of a particular reaction by the removal of a proton to substrate. Nucleophilic catalysis helps in increasing the rate of a particular reaction by the formation of a covalent bond with substrate Metalloenzyme: An enzyme which has a tightly bound Z n 2 + metal ion

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Chapter 22, Problem 39P

Interpretation Introduction

Interpretation: The mechanism for conversion of carbon dioxide to bicarbonate ion in presence of carbonic anhydrase has to be proposed.

Concept introduction:

Enzyme is a protein that is a biological catalyst. The reactant in a reaction catalyzed by the enzyme is called substrate. In the enzyme, a pocket like cleft is present called active site where it binds the substrate.

Some amino acid chains in the enzyme act as base, acid and nucleophilic catalyst. Many of the enzymes contain metal ions at the active site which acts as catalyst.

Acid Catalyst helps in increasing the rate of a particular reaction by the donation of a proton to substrate.

Base Catalyst helps in increasing the rate of a particular reaction by the removal of a proton to substrate.

Nucleophilic catalysis helps in increasing the rate of a particular reaction by the formation of a covalent bond with substrate

Metalloenzyme: An enzyme which has a tightly bound Zn2+ metal ion

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The acid-base indicator HX undergoes the following reaction in a dilute aqueous solution: HX (color 1) H+ + X- (color 2). The following absorbance data were obtained for a 0.00035 M solution of HX in 0.1 M NaOH and 0.1 M HCI. Measurements were made at wavelengths of 450 nm and 620 nm using a 1.0 cm glass cuvette. 450 620 A(460 nm) A(630 nm) 0.1 M NaOH 0.1 M HCI 0.065 0.435 0.895 0.150 In the 0.1M NaOH solution, the indicator will be almost 100% in the X- form, while in 0.1M HCI, the indicator will be nearly 100% protonated (HX). Calculate the acid dissociation constant for the indicator if a pH=5 buffer solution containing a very small amount of indicator exhibits an absorbance of 0.567 at 450 nm and 0.395 at 620 nm (measured in a 1 cm glass cuvette).