Campbell Biology In Focus, Loose-leaf Edition (3rd Edition)
Campbell Biology In Focus, Loose-leaf Edition (3rd Edition)
3rd Edition
ISBN: 9780134895727
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky
Publisher: PEARSON
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Chapter 26, Problem 4TYU
Summary Introduction

Introduction:

Fungi are eukaryotic organisms that include unicellular organisms like molds, yeast and other families of mushroom. Fungi are widely distributed and can reproduce in ranges of habitat from deep sea to deserts.

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a) The lux operon is under positive control. Based on this information, does the luxR regulator sequence make a repressor protein or an activator protein? b) How will binding of this complex affect RNA polymerase? Remember this operon is under positive control. c) AHL is a signal molecule that V. fisheri makes to communicate with neighboring bacterial cells. This molecule can diffuse outside of the cell and into another bacterial cell in close proximity. This type of communication between bacterial cells is known as quorum sensing. If bacterial cell density is low how will this affect the lux operon? What will happen if the density is high?
1) Given an mRNA with the following sequence, please translate the codons to a chain of amino acids. Use the codon chart below.5’AUG/CCU/GCU/UAC/CGG/GAG/UAA3’ “met-_________-_________-_________-_________-_________”STOP”   2) Assuming the original polypeptide chain below, match each type of point mutation with the polypeptide chain that results.   Original polypeptide: Pro-Thr-Ser-Leu-Leu-His-Asn A.    Missense B.    Silent C.     Nonsense D.    Frameshift   ______ Pro-Thr-Ser-STOP     ______ Pro-Thr-Ser-Leu-Ile-His-Asn     ______ Pro-Thr-Ser-Leu-Leu-His-Asn     _______ Pro-Thr-His-Cys-Tyr-Thr
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