Biology: The Dynamic Science (MindTap Course List)
4th Edition
ISBN: 9781305389892
Author: Peter J. Russell, Paul E. Hertz, Beverly McMillan
Publisher: Cengage Learning
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Chapter 17, Problem 15TYK
Summary Introduction
To review:
Whether viruses evolved from complex organisms or are the remnants of precellular life.
Introduction:
Viruses are biological entities that cannot replicate on their own in the absence of a host. They contain a
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O A. The drug inhibits the binding of the viral protein and the viral genomes to the import receptor.
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Chapter 17 Solutions
Biology: The Dynamic Science (MindTap Course List)
Ch. 17.1 - What are the properties of F+, F-, and Hfr cells...Ch. 17.1 - Prob. 2SBCh. 17.2 - Prob. 1SBCh. 17.2 - How does viral infection of an animal cell and a...Ch. 17.2 - Prob. 3SBCh. 17.3 - Prob. 1SBCh. 17 - Prob. 1TYKCh. 17 - Prob. 2TYKCh. 17 - Which of the following is not correct for...Ch. 17 - Prob. 4TYK
Ch. 17 - Prob. 5TYKCh. 17 - Prob. 6TYKCh. 17 - When a virus enters the lysogenic stage: a. the...Ch. 17 - An infectious material is isolated from a nerve...Ch. 17 - Prob. 9TYKCh. 17 - Prob. 10TYKCh. 17 - Prob. 11TYKCh. 17 - Discuss Concepts As a control for their...Ch. 17 - Prob. 13TYKCh. 17 - Prob. 14TYKCh. 17 - Prob. 15TYKCh. 17 - Prob. 1ITD
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- Can u help me to explain to me, please?arrow_forwardVirologyarrow_forwardA virus that has which type of genome must carry replicase within the viral particle? (choose all that apply) ds DNA ss (+) DNA ss (–) DNA ss (+) RNA ss (–) RNA Which viral type has a genome that can be directly translated? (choose all that apply) ds DNA ss (+) DNA ss (–) DNA ss (+) RNA ss (–) RNAarrow_forward
- 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)arrow_forwardViruses 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…arrow_forwardThe diversity of nucleic acids in plant viruses is great. Which class of viruses contain single-stranded RNA? These viruses are the source of which important enzyme (Hint: THis is the enzyme needed to make cDNA)?arrow_forward
- For many years, scientist believed that proteins were the source of heritable information. There are many thousands of different proteins in a cell, and they mediate the cell’s metabolism, producing the traits and characteristics of a species. Researchers working with DNA viruses proved that it is DNA that stores and passes on genes. They worked with viruses with an outer coat of protein and a DNA strand inside. How did they prove that it was DNA, not protein, which is the primary source of heritable information?arrow_forwardillustrates Fraenkel-Conrat and Singer’s experiment on the genetic material of TMV. What results would you expect in this experiment if protein carried the genetic information of TMV instead of RNA?arrow_forwardYou are a virologist studying a newly isolated viral strain and have sequenced its genome. You find that the genome contains 25% A, 55% G, 20% C, and 10% U. Which of the following conclusions is likely correct? This is a single-stranded RNA virus This is a single-stranded DNA virus This is a double-stranded RNA virus This is a double-stranded DNA virus No conclusions can be drawn from this informationarrow_forward
- If a viral host cell has a mutation that interferes with the addition of carbohydrates to proteins (glycoproteins) during processing in the Golgi apparatus, which of the following processes is most likely to occur? O A. Viruses released by that host cell would have a decreased ability to infect cells than the virus that originally infected the cell. B. The virus-encoded protease would be unable to cleave large viral proteins into smaller, functional polypeptides. OC. The virus would be unable to replicate within the host cell. D. Viruses released by that cell are novel and would result in infections with higher mortality rates.arrow_forwardBacteria exposed to viruses incorporate sections of the virus’s DNA into the CRISPR array sequences in their genome. This mechanism allows bacteria to fight off the viruses, like an immune response: the information in CRISPR spacers served as “coordinates” for recognizing and cutting up invading DNA sequences. Describe what might happen under the conditions described after a bacteriophage infects a bacterial cell and releases its DNA into the bacterial cell. Explain why: 1. The invading phage DNA is recognized by the Cas proteins but not inserted into the CRISPR array region of the bacterial genome: The bacteria will be unable to elicit an immune response and will succumb to the phase infection 2. The cas genes on the bacterial genome contains a missense mutation that increases its cleavage/cut activityThe bacteria will elicit an immune response that will successfully fight the phage infectionarrow_forwardIn RNA viruses, the + RNA genome can act as mRNA right away and proteins can be made. The + genome is used to make - genome, which then makes + genome? and which is the genome that will be packaged to leave the cell?arrow_forward
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