Concept explainers
To analyse:
The origin of viruses and the fact that viruses can so easily enter and get uncoated inside human cells.
Introduction:
Viruses are unique microorganisms that don’t show any signs of life until they come in contact with their specific hosts. Once this contact happens, viruses enter their host cells and use the cellular and genetic machinery of the host cell to multiply. Once their multiplication cycle is over, they are released from the host cell and infect new host cells.
Explanation of Solution
Since viruses are very simple in structure, comprising of only
This is clearly evident in the ease with which viruses are able to enter inside their host cells. The presence of corresponding receptors on the surface of the host cell and the machinery to uncoat viral particles clearly indicate the evolutionary connection between viruses and living cells.
Viruses and living cells seem to be evolutionarily connected.
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Chapter 6 Solutions
Foundations in Microbiology
- ‘’Viruses cannot be grown in standard microbiological culture such as broth and agar. They need to be cultured in the presence of a suitable host such as prokaryotic cells (easiest to grow in the lab), plants and animals because they are unable to reproduce independently in living cells’’.2.2 What are the changes that are brought by a virus to a cell? In your response, make reference to the cytopathic effect (CPE).arrow_forwardMany viruses have the ability to resurrect dead cells. Why investigating this feature of viruses may be relevant to youarrow_forwardExplain one structural distinction between viruses and cells.arrow_forward
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- Which of the following highly contagious viruses is a single-stranded ribonucleic acid (RNA) virus with a helical capsid and envelope and is transmitted by coming in contact with respiratory secretions? "This is a highly contagious respiratory illness transmitted when an infected person coughs or sneezes virus particles into the air," the health department said in a written statement. "It's so contagious that if one person is sick and spreading measles, nine out of 10 people around them who aren't immune will get it, too." Group of answer choices a. Measles b. Parvovirus c. Coxsackie virus A d. Rhinovirusarrow_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_forwardDefine the terms "latency" and "lysogeny" as they refer to viruses. Describe at least TWO ways these two processes are similar. Describe at least TWO ways these two processes are different.arrow_forward
- Contrast a virus with a cellular organism. and Describe the structure of a virus. and Describe the structure and common shapes of prokaryotic cells. .arrow_forwardThroughout history there are many different types of virus that have caused impacts both small and large. Is there a possibility a virus could be considered a "good virus"? Please provide an argument for both yes and no with the use of a proper example, facts and conceptual information.arrow_forwardIs a Virus considered living or non-living (Justify the answer)? Give one example of a virus.arrow_forward
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