Microbiology: An Evolving Science (Fourth Edition)
4th Edition
ISBN: 9780393615098
Author: John W. Foster, Joan L. Slonczewski
Publisher: W. W. Norton & Company
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Chapter 6.3, Problem 1TQ
Summary Introduction
To review :
The viruses with different kinds of genomes that combine and share the genetic content in their progeny.
Introduction:
Viruses are very diverse in nature. Viruses are often classified based on the relatedness of their gene sequences. This criterion of classification becomes problematic when the viruses recombine their genome within the host, which is infected by them. Hence, the viruses are classified based on the virion structure and the host range along with the genome composition.
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Viruses are made up of the same biomolecules as cellular organisms (DNA, RNA, proteins, lipids, etc.), which are synthesized through enzymatic dehydration reactions from building blocks and disassembled by enzymatic hydrolysis. They infect cells and replicate themselves using resources from the host cells. Scientists discovered a previously unknown strain of virus in the tropical Pacific Ocean and it can infect higher-order eukaryotes. Initial analysis revealed that the virus is mainly composed of nucleic acids, proteins, and lipids. Chemical analysis after complete hydrolysis revealed the following building blocks (by weight):
Chemical components
Nucleosides
Amino acids
Lipids, phosphates, and carbohydrates
Percentage by weight
20
30
50
Analysis of percentages of nucleosides yielded the following results (by molar ratio):
Nucleosides
A
G
T
C
U
Percentage by mole
19
29
19
29
4
Which of the following events mostly involves hydrolysis reaction after the virus infects…
How does recombination in bacteria differ from recombination in eukaryotes?
1) Recombination does not occur in prokaryotes
2) Only the plasmid DNA goes through recombination in prokaryotes
3) Sister chromatids, not homologous chromosomes, exchange information during recombination in prokaryotes
4) A portion of DNA from genome is replaced with homologous DNA from another strain of bacteria.
Which biological system contains a protein nucleocapsid surrounding 2 antiparallel polynucleotide strands (held together by hydrogen bonds), with deoxyribose sugars, but no ribose sugars?
a single-stranded RNA viroid (like avocado sun blotch viroid)
a double-stranded RNA virus (like the reovirus family)
a single-stranded DNA virus (like fX174 virus of E. coli)
a double-stranded DNA virus (like the smallpox virus)
a single-stranded RNA virus (like tobacco mosaic virus)
Chapter 6 Solutions
Microbiology: An Evolving Science (Fourth Edition)
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