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 1, Problem 11TYK
Summary Introduction
To review:
Whether the viruses can be considered living, based on their characteristics.
Introduction:
A virus is a small infectious agent composed of DNA/RNA (deoxyribonucleic acid/ribonucleic acid) and a protein coat. Viruses cannot replicate on their own and need the machinery of other cells. Viruses are mostly host specific. They perform the lytic cycle to replicate them and then burst out of the host cell, or may undergo lysogeny.
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Students have asked these similar questions
/Are viruses living? Discuss based from the properties of life in Biology.
Do you consider viruses to be alive?
Take a position on the issue and perform research to find evidence in support of your argument.
Share and discuss this evidence with your peers to come to a final consensus on whether viruses should be considered living organisms.
How is the entry (penetration) of an animal virus into its host cell similar or
different to the entry of a bacteriophage into its host cell?
The entire viral particle (capsid and genome) can penetrate an
animal cell, while only the viral genome can penetrate a bacterial
cell.
There is no difference; the entire viral particle (capsid and
genome) penetrates both cell types.
There is no difference; only the viral genome penetrates both cell
types.
The viral genome can penetrate an animal cell, while the entire
viral particle (capsid and genome) penetrates a bacterial cell.
Chapter 1 Solutions
Biology: The Dynamic Science (MindTap Course List)
Ch. 1.1 - Prob. 1SBCh. 1.1 - What do living organisms do with the energy they...Ch. 1.1 - What is a life cycle?Ch. 1.2 - What is the difference between artificial...Ch. 1.2 - How do random changes in the structure of DNA...Ch. 1.2 - Prob. 3SBCh. 1.3 - What is a major difference between prokaryotic and...Ch. 1.3 - Prob. 2SBCh. 1.3 - Prob. 3SBCh. 1.4 - In your own words, explain the most important...
Ch. 1.4 - What information did the copper lizard models...Ch. 1.4 - Prob. 3SBCh. 1 - What is the lowest level of biological...Ch. 1 - Which category falls immediately below class in...Ch. 1 - Houseflies develop through a series of programmed...Ch. 1 - Which structure allows living organisms to detect...Ch. 1 - Prob. 5TYKCh. 1 - Prob. 6TYKCh. 1 - Which of the following represents the application...Ch. 1 - Which of the following is not a component of...Ch. 1 - Which of the following questions best exemplifies...Ch. 1 - When researchers say that a scientific hypothesis...Ch. 1 - Prob. 11TYKCh. 1 - What role did the copper lizard models play in the...Ch. 1 - Prob. 13TYKCh. 1 - Prob. 14TYKCh. 1 - Apply Evolutionary Thinking When a biologist first...Ch. 1 - Prob. 1ITD
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- Researchers have recently discovered giant viruses that are 1 μm in length, the same size as some bacterial cells. The genomes of these viruses contain over 2 million base pairs of DNA, which is more DNA than is found in many bacterial genomes, and their genomes contain hundreds—in some cases, thousands—of genes. Given these observations and what you know about viruses, should viruses be considered living or nonliving? Give arguments for and against considering viruses as living organisms.arrow_forwardWhich of the following statements accurately distinguishes between viruses, prokaryotic cells, and eukaryotic cells? Viruses are not cellular and require a host to replicate, prokaryotic cells lack a nucleus, and eukaryotic cells contain a nucleus and other membrane-bound organelles Viruses, prokaryotic cells, and eukaryotic cells all contain a nucleus Viruses and prokaryotic cells are always unicellular, while eukaryotic cells are always multicellular Viruses do not contain organelles, while prokaryotic and eukaryotic cells doarrow_forwardYou have discovered a new disease-causing virus. It has a negative sense RNA genome. Infected individuals often have few-to-no symptoms, but are continuously infectious to other individuals for months after initial infection. Which of the following is likely true about this virus? (Select all that apply) Its genome must first circularize before being translated into proteins It carries a replicase protein into a host cell upon infection. The symptoms of this virus exemplify a latent infection. The virus has infected every cell within an infected individual. The virus must first synthesize the complementary strand RNA before expressing new proteins. The symptoms of this virus exemplify a chronic infection.arrow_forward
- Use the information to answer the following question. Two students were debating whether viruses are living or nonliving. Student A: Viruses are living because they contain DNA or RNA and reproduce. Student B: Viruses are nonliving because they do not grow and do not use energy. Which student's claim is correct and why? O A. Student B, because viruses do not use or make energy. Even though they contain DNA and RNA, many other non-living things also contain DNA and RNA. O B. Student B, because viruses do not grow and do not use energy. Although they have DNA and RNA, they are only able to reproduce with a host cell. O C. Student A, because viruses are able to reproduce and continue to spread their disease to other hosts. As the virus becomes more dangerous, it grows and becomes larger. O D. Student A, because all living things must have DNA or RNA. They must use energy in order to reproduce and make more viruses.arrow_forwardWhat is life? Why are viruses not considered alive? What other things can you think of that are not alive but might be almost alive?arrow_forwardWhich 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_forward
- Why are viruses are not regarded as true living cells?arrow_forwardAs a general rule, viruses are not considered to be alive based on several reasons. One such reason is that some viruses use RNA as their genetic material instead of DNA. Which of the five biological themes does this violate? Briefly explain why.arrow_forwardBecause viruses lack some of the traits seen in all living things, many scientists do not believe viruses to be genuinely "alive." Using a few characteristics of live organisms as examples, explain why viruses may not be truly "alive."arrow_forward
- 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…arrow_forwardWhat is true about the difference between prions and viruses? Viruses have genomes composed of RNA, whereas prions have genomes composed of DNA. Viruses have capsids composed of protein, whereas prions are made only of nucleic acid. Viruses infect many types of cells, whereas prions infect only prokaryotic cells. Viruses generally cause disease symptoms quickly, whereas prions generally take many years to cause disease symptoms.arrow_forwardWhich description below describes viruses? acellular, made of protein capsid which protects viral genetic informaion, either DNA or RNA but not bo O acelluar, eukaryotes, Domain Archaea O cellular, eukaryotes, Domain Eukarya O acellular, prokaryotes, Domain Bacteria Question 14 Your lab partner wants to know the reasons viruses are not considered cells. You provide all the following reasons EXCEPT you make one mistake. Which statement below is FALSE with regard to why viruses are not considered cells?arrow_forward
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