if you want to remove an article from website contact us from top.

    which of the following statements concerning viruses is true?

    James

    Guys, does anyone know the answer?

    get which of the following statements concerning viruses is true? from EN Bilgi.

    Practice Questions

    Practice Questions

    Principles of Virology

    (Write down your answers and then click at bottom of page for the correct answers.)

    Viruses range in size from approximately

    1 - 25 nm 25 - 300 nm 300 nm - 1 um 1 - 25 um 25 - 300 um

    Which of the following nucleic acid types are not found in viruses?

    liner double stranded DNA

    circular double stranded DNA

    linear single stranded RNA

    circular single stranded RNA

    double stranded RNA single stranded DNA

    all of the above are found in viruses

    How do viruses transport substances across their membrane.

    active transport

    facillitated diffusion

    endocytosis pinnocytosis group translocation simple diffusion all of the above none of the above

    Viruses can be taken apart (separated) into capsid proteins and nucleic acid. When placed back together, these two parts will self assemble into new infectious virus particles. You purify the NUCLEIC ACID FROM TOMATO mosaic virus and the PROTEIN FROM BEAN mosaic virus. Then you combine these two parts, and they self-assemble into infectous viruses. Which one of the following should happen when these newly assembled (hybrid) viruses are rubbed (with an abrasive) onto BEAN LEAVES?

    Virus will infect bean leaves and produce tomato mosaic viruses.

    Virus will infect bean leaves and produce bean mosaic viruses.

    Virus will infect bean leaves and produce both bean and tomato mosaic viruses.

    Virus will not infect bean leaves, thus no viruses are produced.

    Virus will infect bean leaves, but lysogeny will prevent new viruses from forming.

    The main purpose of the early viral genes that are expressed is to

    take over the host machinery

    synthesize nuleic acids

    to uncoat the virus to cause disease

    make the protein coat

    none of these

    Viruses are limited in their host range because

    They can only replicate in certain types of cells

    Only certain cells are suseptible to viral infections

    They can only absorb to cells with proper receptors

    They can only absorb to cells with glycoproteins

    They can only bind to cells that have the opposite charge

    All of the following descriptions concerning viral multiplication and nucleic acids are true EXCEPT that:

    viruses contain DNA or RNA, not both.

    viruses replicate only in living cells

    viruses use the cell's biosynthetic machinery to synthesize copies of themselves.

    the nucleic acid of a virus is surrounded by a protein coat.

    viral m RNA, viral t RNA, and viral ribosomes are used in viral replication.

    Which of the following statements explains why viruses are only able to multiply in living cells?

    Their binary fission is controlled by host cell genes.

    Virus do not possess the necessary components for self-replication.

    DNA is only able to replicate inside living cells.

    They have only enough genetic information for DNA replication.

    Viruses are too small in size to multiply outside living cells.

    Which of the following statements correctly describes how the host cell membrane is changed by viral replication?

    Pores develop.

    A glycocalyx layer is formed.

    The membrane is resynthesized

    Viral proteins are acquired.

    The viral genome is inserted into the membrane

    All of the following statements are true regarding the attachment or adsorption of the virion to the host cell EXCEPT that:

    for naked virions, the surface capsid proteins are responsible for binding to a specific cell receptor.

    for enveloped viruses, the spikes are responsible for binding to a specific cell receptor.

    a cell lacking a receptor for a specific virus is not infected by that virus.

    animal viruses, such as influenza and HIV are highly specific in that they can only bind with particular cell types.

    plant viruses, such as tobacco mosaic virus, require specific receptor sites to attach to cells.

    All of these are true.

    Correct

    Answers

    Related

    Overheads

    More

    Questions

    Learning

    Objectives

    Please e-mail comments to [email protected]

    Microbiology Home page.

    Source : www.tusculum.edu

    Which of the following statements regarding viruses are correct?(i) These are cellular infectious, nucleoprotein particles.(ii) They can be grown in culture medium.(iii) Genetic material is either DNA or RNA, but never both.(iv) They can be crystallized.

    Click hereπŸ‘†to get an answer to your question ✍️ Which of the following statements regarding viruses are correct?(i) These are cellular infectious, nucleoprotein particles.(ii) They can be grown in culture medium.(iii) Genetic material is either DNA or RNA, but never both.(iv) They can be crystallized.

    Which of the following statements regarding viruses are correct?

    Question

    (i) These are cellular infectious, nucleoprotein particles.

    (ii) They can be grown in culture medium.

    (iii) Genetic material is either DNA or RNA, but never both.

    (iv) They can be crystallized.

    A

    (i) and (ii)

    B

    (ii) and (iii)

    C

    (iii) and (iv)

    D

    (i), (ii), (iii) and (iv)

    Medium Open in App Solution Verified by Toppr

    Correct option is C)

    A virus is made up of a core of genetic material, either DNA or RNA, surrounded by a protective coat called a capsid which is made up of protein.

    Viruses are inert crystalline structures outside a living cell because these are non-cellular.

    Viruses are obligate parasites. They require a host cell to replicate and to carry out the different activities.

    The viruses can be cultured in the chick embryo and the primary cell culture. The cells in the cell culture die after some time and thus, the viruses cannot be cultured and maintained for a long time.

    So, the correct answer is option C.

    Was this answer helpful?

    0 0

    Source : www.toppr.com

    CH 13 HW Flashcards & Practice Test

    Memorize flashcards and build a practice test to quiz yourself before your exam. Start studying the CH 13 HW flashcards containing study terms like Which of the following statements concerning viruses is true?, Which statement concerning viral structure is true?, How does specialized transduction differ from regular lysogeny? and more.

    CH 13 HW

    5.0 11 Reviews

    11 studiers in the last hour

    Which of the following statements concerning viruses is true?

    Click card to see definition πŸ‘†

    The "host range" for a virus is determined by the presence or absence of particular components on the surface of a host cell that are required for the virus to attach.

    Click again to see term πŸ‘†

    Which statement concerning viral structure is true?

    Click card to see definition πŸ‘†

    Spikes are found on some viruses. They are very consistent in structure and can be used for identification.

    Click again to see term πŸ‘†

    1/23 Created by maryehh

    Terms in this set (23)

    Which of the following statements concerning viruses is true?

    The "host range" for a virus is determined by the presence or absence of particular components on the surface of a host cell that are required for the virus to attach.

    Which statement concerning viral structure is true?

    Spikes are found on some viruses. They are very consistent in structure and can be used for identification.

    How does specialized transduction differ from regular lysogeny?

    The prophage in specialized transduction carries with it pieces of the host chromosomal DNA.

    What happens to the packaged DNA of a specialized transduced phage when it infects a new recipient cell?

    The host DNA integrates, with the prophage, into the new recipient chromosome.

    How can specialized transduction contribute to the transfer of antibiotic resistance genes in a bacterial population?

    The prophage takes an antibiotic resistance gene with it and is packaged with the newly synthesized viral DNA.

    Which of the following is true concerning a lysogenic viral replication cycle?

    During lysogeny, the viral genome integrates into the host DNA, becoming a physical part of the chromosome.

    How are viruses different from cells?

    They require a host in order to reproduce.

    What is the function of the structural elements of a virus?

    To package and protect the viral genome

    We sometimes are able to generate antibodies (immune system proteins) that bind to and cover up some of the proteins on the outermost portion of a virus while it is in the bloodstream. This renders the virus unable to reproduce. Which step of viral replication are antibodies directly preventing?

    attachment

    Enveloped viruses have a layer of lipids surrounding their capsid. This envelope is made mostly of host cell membrane. In which step does the virus acquire this envelope?

    release

    What occurs during viral uncoating?

    The capsid breaks apart, releasing the viral genome.

    Which of the following statements regarding latent viral infections is true?

    Latent infections can persist for years in an individual without causing any symptoms.

    Which of the following is true regarding cultivation and isolation of animal viruses?

    Diploid cell culture lines, developed from human embryos, are widely used for culturing viruses that require a human host.

    From which phrase is the term "prions" derived?

    Proteinaceous infectious particles

    In what year did Stanley Prusiner discover prions?

    1982

    Which disease did Stanley Prusiner first identify as being caused by prions?

    Scrapie

    How are prions different from other infectious agents?

    They lack nucleic acid.

    The normal function of the PrP protein in mammals is believed to be

    assisting in normal synaptic development and function.

    How do normal prion proteins (PrP) differ from the infectious prion proteins?

    Normal PrP have alpha-helices; infectious PrP have beta-pleated sheets.

    How does the number of infectious prions increase?

    Prions transform normal proteins into the misfolded beta-pleated sheet configuration; therefore, prions multiply by conversion.

    Why are the beta-pleated multimers of PrP potentially pathogenic?

    The multimers are more stable and resistant to protease.

    Which of the following statements concerning prion diseases is true?

    Normal host cellular prion proteins (PrPC) are converted into scrapie proteins (PrPSc)

    Which of the following is true of viroids?

    Viroids are short pieces of naked RNA.

    Recommended textbook explanations

    Miller and Levine Biology

    1st Edition

    Joseph S. Levine, Kenneth R. Miller

    1,773 explanations Campbell Biology 11th Edition

    Lisa A. Urry, Michael L. Cain, Peter V Minorsky, Steven A. Wasserman

    1,679 explanations

    Campbell Biology (AP Edition)

    10th Edition

    Cain, Campbell, Minorsky, Reece, Urry, Wasserman

    1,708 explanations

    Campbell Biology (AP Edition)

    9th Edition

    Cain, Jackson, Minorsky, Reece, Urry, Wasserman

    715 explanations

    Sets with similar terms

    Microbiology Chapter 13

    20 terms Human_Atlas

    Micro Ch.13 Hwk Questions

    27 terms Jdmedina

    Chapter 13 Mastering Micro HW

    30 terms heatjohn31

    Chapter 13 Mastering Micro HW

    36 terms smartscott

    Sets found in the same folder

    Mastering Microbiology Chapter 13

    39 terms Sarahthompson_2

    Microbiology Chapter 13 - Viruses, Viroids, a…

    27 terms nbutler93

    Mastering Microbiology Ch 13

    Source : quizlet.com

    Do you want to see answer or more ?
    James 11 month ago
    4

    Guys, does anyone know the answer?

    Click For Answer