BIOLOGY
12th Edition
ISBN: 9781260169614
Author: Raven
Publisher: RENT MCG
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Chapter 26, Problem 2U
Summary Introduction
Introduction: Any group of viruses that infect and replicate within the bacteria are referred to as bacteriophages. They inject their own genetic material into the bacterial cells and use the biological machinery of the bacteria for their reproduction.
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Some strains of Escherichia coli bacteria have acquired the ability to produce the harmful Shiga toxin, normally produced by Shigella dysenteriae. Which statements best explain why this occurs? Mark all that apply.
A. conjugation between two different species of bacteria allowed both strains of bacteria to express a virulence factor
B. transformation resulted in expression of a virulence factor
C. horizontal gene transfer between different species of bacteria
D. transduction of a specific gene resulted in expression of new traits
A study is performed in persons with an immunodeficiency disease in which activation of macrophages and B cells by CD4 cells is ineffective. It is observed that all affected persons are males. Laboratory studies show an elevated serum IgM but decreased IgG and IgA. This disorder is most likely to be caused by a mutation in a gene encoding for which of the following?
a.CD40 ligand
b.Adenine deaminase
c.Cytochrome b558
d.Complement C3
When the antigen-presenting cells binds to the T-cell, it will cause the T-cell to increase the amount of a protein called perforin, which is secreted to kill nearby cells. Which of these could INCREASE the amount of a functional perforin proteins produced?
a. Increased methylation of DNA near the site of the gene
b. Increased binding of a repressor, that decreases the binding affinity between TFIID and DNA
c. Increased production of a small RNA that is complementary to perforin mRNA
d. Increased O-linked glycoslyation of perforin proteins in the Golgi
Chapter 26 Solutions
BIOLOGY
Ch. 26.1 - Prob. 1LOCh. 26.1 - Prob. 2LOCh. 26.2 - Prob. 1LOCh. 26.2 - Prob. 2LOCh. 26.3 - Prob. 1LOCh. 26.3 - Describe how viruses can contribute DNA to their...Ch. 26.4 - Describe the differences between acute and...Ch. 26.4 - Prob. 2LOCh. 26.4 - Prob. 3LOCh. 26.5 - Prob. 1LO
Ch. 26 - Prob. 1UCh. 26 - Prob. 2UCh. 26 - Prob. 3UCh. 26 - Prob. 4UCh. 26 - Why is a drug that blocks HIV binding to one of...Ch. 26 - Prob. 6UCh. 26 - Prob. 7UCh. 26 - Prob. 1ACh. 26 - Prob. 2ACh. 26 - Prob. 3ACh. 26 - Prob. 4ACh. 26 - Prob. 5ACh. 26 - Prob. 6ACh. 26 - Prob. 7ACh. 26 - E. coli lysogens derived from infection by phage ...Ch. 26 - Prob. 2SCh. 26 - Prob. 3SCh. 26 - Prob. 4SCh. 26 - Prob. 5S
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