Lehninger Principles of Biochemistry
Lehninger Principles of Biochemistry
7th Edition
ISBN: 9781464126116
Author: David L. Nelson, Michael M. Cox
Publisher: W. H. Freeman
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Chapter 25, Problem 5P

(a)

Summary Introduction

To determine: If any of the four nucleotides were omitted from the incubation mixture, will radioactivity be found in the precipitate when extracts of E.coli containing dATP, dTTP, dGTP, dCTP are labeled with αP-32.

Introduction:

Radioactive labeling is used for the analysis and tracing of the various metabolic reactions occurring inside the cell.

(b)

Summary Introduction

To determine: If there will be labeling of 32P if only labeled dTTP is added in the synthesis mixture.

Introduction:

Nucleotides present in DNA include thymine, cytosine, adenine and guanine. They form the strands after synthesis of polynucleotide chain.

(c)

Summary Introduction

To determine: If radioactivity will be formed in the precipitate when β,γ-phosphate are used instead of α-phosphate in the deoxyribonucleotides.

Introduction:

Deoxynucleotides consist of deoxyribose sugar, purine or pyrimidine ring and a phosphodiester bond formed between 5'P and 3'OH in the nucleotide strand.

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