Chapter 20, Problem 71E

Interpretation Introduction

Interpretation:

The rate expression for the formation of double helix in DNA is to be derived from the following mechanism:

$(S_1+S_2)\stackrel{}{\rightleftharpoons }{(S_1:S_2)}^{*}faststep$

${(S_1:S_2)}^{*}\to (S_1:S_2)slowstep$

Where S₁ and S₂ represent strand 1 and 2 and (S₁:S₂)^* is the unstable helix.

Concept introduction:

• An intermediate is species that is formed during the reaction but is not the product of that reaction. It means it is produced during the reaction and consumed during the reaction.
• Steady state approximation is a method to derive the rate law. According to this, the intermediate is consumed as soon as it is produced.