Concept explainers
A virus is a tiny infectious
- a. cell.
- b. living thing.
- c. particle.
- d.
nucleic acid .
Introduction:
Viruses are the small infectious particle that causes severe or mild infections in humans, plants, and animals. Viruses are not alive when they are present outside the host body. They need a host to reproduce or replicate. A virus contains a capsid (coat protein), nucleic acid, and an envelope (lipid membrane)
Answer to Problem 1MCQ
Correct answer:
A virus is a tiny microscopic infectious particle. Therefore, option (c) is correct.
Option (c) is given as “particle”.
Explanation of Solution
Justify reason for the correct statement:
Viruses are the lifeless molecule and unable to multiply independently from the host cell. They are not living, but when they are present in a host they possess certain processes of the living organismbut do not exhibit most of the processes. Therefore, viruses can be better described as the infectious particles rather than organisms.
Hence, option (c) is correct.
Justify reasons for the incorrect statements:
Option (a) is given as “cell”.
Viruses are not made of cells. Hence, it is a wrong answer.
Option (b) is given as “living thing”.
Viruses are not living things because they are unable to multiply or grow in number independently from the host cell. Hence, it is a wrong answer.
Option (d) is given as “nucleic acid”.
Viruses do contain a nucleic acid, but they cannot be defined as an infectious nucleic acid because it is one of a component of a virus. Hence, it is a wrong answer.
Hence, options (a),(b), and(d) are incorrect.
Hence, viruses can be defined as the tiny infectious particles.
Want to see more full solutions like this?
Chapter 6 Solutions
Microbiology: A Systems Approach
- Define the following terms: a. virus b. virion c. capsid d. retrovirus e. enveloped virusarrow_forwardViruses contain either DNA or RNA. Viruses possess their own metabolic system a. FIRST statement is TRUE; SECOND statement is FALSE b. BOTH Statements are TRUE c. FIRST statement is FALSE; SECOND statement is TRUE d. BOTH statements are FALSEarrow_forwardA researcher, studying two different animal viruses (A and B) that infect the same cell type, digests away all the protein and transfers the nucleic acid directly into the host cell. Only virus B causes the infection. This suggests: a. Virus A is likely to be a naked virus. b. Virus A is likely to be an enveloped virus. c. Virus A is likely to be a -ssRNA virus. d. Virus A is likely to be a +ssRNA virus. e. Virus A is likely to be a dsDNA virus. And now explain why.arrow_forward
- Choose the correct word: The virus attacks ______________ cells in the brain. Select one: a. specific b. wealthy c. beneficial d. intensivearrow_forwardWhat's the term to describe a mutant viral protein, apart from any genetic material, that can cause disease?O A. VirusO B. VirionO C. ViroidO D. Prionarrow_forwardWhich receptors of the influenza virus are responsible for binding tothe host cell?a. hemagglutinin b. neuraminidase c. type A d. capsid proteinsarrow_forward
- The --------------- retrovirus contains a ______________ genome: Select one: a. chicken pox, circular DNA b. Sars CoVII, double-stranded RNA c. measles, double-stranded DNA d. HIV, Single-stranded RNAarrow_forwardWhich of the following is NOT used to treat active viral disease? a. Vaccines b. Antiviral drugs c. Antibiotics d. Phage therapyarrow_forwardViruses in the Herpesviridae family are double-stranded DNA enveloped viruses. Specifically the virus Varicella can cause chickenpox, which when in adults is called ___________. This can exist as a ____________ in the DNA of host cells. Select one: a.herpes/ Provirus b.measles/ Provirus c.Shingles / Prophage d.None of the Above e.Shingles / Provirusarrow_forward
- Select a drug or drugs that can prevent a viral nucleic acid from beingreplicated.a. retrovir b. acyclovir c. saquinavir d. both a and barrow_forwardRibosomes are the only organelles present in all viruses. a. True b. Falsearrow_forwardViruses are acellular because a. they are biological entities that do not have a cellular structure. b. they are known as virions that obtain their genetic materials from their host c. they are only fragments of non living material. d. None from choices a-carrow_forward
- Medical Terminology for Health Professions, Spira...Health & NutritionISBN:9781305634350Author:Ann Ehrlich, Carol L. Schroeder, Laura Ehrlich, Katrina A. SchroederPublisher:Cengage Learning