Campbell Biology Plus Masteringbiology
Campbell Biology Plus Masteringbiology
10th Edition
ISBN: 9780321775849
Author: Jane B. Reece, Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Robert B. Jackson
Publisher: PEARSON
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Chapter 20, Problem 9TYU
Summary Introduction

To explain: The cloning of the human crystallin gene to obtain a sufficient amount of the human crystallin protein.

Concept introduction:

Protein encoding genes express themselves and form functional gene products in the form of proteins. This is known as gene expression. Generally, polymerase chain reaction (PCR) is used for the amplification of the gene sequence of interest and to synthesize its multiple copies. This gene fragment is then inserted into the expression vector to synthesize the protein encoded by the gene.

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Now you have the gene sequence. Now you would like to clone it into an expression vector to grow up in a bacterial system. Because you're going to use bacteria to generate protein from a eukaryote, the mammoth, you need to get rid of introns from your sequence. How do you do that?     Bioinformatically, I look for splice-site sequences and branch-point adenines and predict intron-exon boundaries     I use a comparative genomic approach and use sequence homology with the genome of a closely related species     I use a comparative genomic approach and use sequence homology with the genome of a distantly related species     Both A and B     Both B and C   Why did you bother to identify the introns?     So that I could include them in the sequence to understand intron function.     So that I could exclude them from the sequence because prokaryotes don't have spliceosomal machinery.     So that I could see how introns affect protein folding.
. Let’s say that you have incredible skill and can isolate the white and red patches of tissue from the Drosophila eyes shown in Figure 12-24 in order to isolate mRNA from each tissue preparation. Using your knowledge of DNA techniques from Chapter 10, design an experiment that would allow you to determine whether RNA is transcribed from the white gene in the red tissue or the whitetissue or both. If you need it, you have access to radioactive white-gene DNA
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