EBK BIOLOGY
11th Edition
ISBN: 8220102797352
Author: Raven
Publisher: YUZU
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Question
Chapter 27, Problem 6U
Summary Introduction
Introduction:
Virus is an infectious small particles that can not be seen through the naked eyes. The human immumodeficiency virus is a lentivirus which is a causative agent of HIV/AIDS. This HIV virus attacks on T-cells, which provide immunity against the infection that results the loss of the immunity and individual get susceptible to the virus. The HIV virus consists outer envelope on which glycoprotein spikes are present.
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Students have asked these similar questions
Identify the mismatched pair.
a. CXCR4: lymphocyte tropic
b. exogenous retrovirus: originates outside host’s body
c. infectious virion production: activated CD4 T cells
d. tat: controls export of transcripts from the nucleus
e. lentivirus: long incubation period
f. CCR5: macrophage tropic.
Which of the following virus does not use CXCR4 as a receptor?
a. HIV-2
b. SIV
c. poliovirus
d. HIV-1
Which pertains to the immune response of a woman who has just inhaled a coronavirus to which she has no immunity.
A.an immune response will begin once the antigen enters lymphoid tissues as the lymph nodes
B. IgA directed toward this coronavirus will be immediately present in respiratory secretions
C. each Ab produced against an epitope of the coronavirus will have identical binding sites
D. only B lymphocytes will be capable of responding to the coronavirus
E. only IgM will be produced in the initial response.
Chapter 27 Solutions
EBK BIOLOGY
Ch. 27 - The reverse transcriptase enzyme is active in...Ch. 27 - Which of the following is NOT part of a virus? a....Ch. 27 - Which of the following is common in animal viruses...Ch. 27 - Which of the following would NOT be part of the...Ch. 27 - A process by which a virus may change a benign...Ch. 27 - Prob. 6UCh. 27 - Prob. 7UCh. 27 - Prob. 1ACh. 27 - The idea of a protein that was an infectious agent...Ch. 27 - Bacterial viruses and animal viruses are similar...
Ch. 27 - Prob. 4ACh. 27 - Phage conversion in which viruses add genes to a...Ch. 27 - According to the prion hypothesis, the infectious...Ch. 27 - Prob. 7ACh. 27 - Prob. 8ACh. 27 - E. coli lysogens derived from infection by phage ...Ch. 27 - Most biologists believe that viruses evolved...Ch. 27 - Prob. 3SCh. 27 - What do we mean by the term emerging virus? How is...Ch. 27 - How might phage be used to transfer E. coli genes...
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Similar questions
- with HIV, explain the mechanism of intracellular infection and the role of reverse transcriptase. What would you explain about the process? What is the significance of the CD4+ count? ( Discuss the meaning of various ranges of CD4 counts.) List 5 opportunistic infections AND describe data to suggest whether or not a patient has such an infection.arrow_forwardNotice the comment that after treatment your CD4 count should rise. Why does treatment allow CD4s to increase? A Anti-retroviral therapy consists of transfusions of CD4 cells. B Anti-retroviral therapy directly stimulates cell division of CD4 cells, so their numbers increase. C Anti-retroviral therapy will prevent HIV from replicating and killing your CD4s. CD4s can grow back to some degree.arrow_forwardWe are confronted with a new RNA virus that uses x-proteins to attach to host cells and primarily infects liver cells. Based on this we would expect: (2 answers only) a. possible latent infections b. viral susceptibility to valacyclovir c. viral suspeptibility to RNA->RNA pol inhibitor d. symptoms of hepatitsarrow_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_forwardConsider the events that occur in HIV infection. I. HIV undergoes molecular self assembly.II. The protein gp120 binds to CD4.III. The HIV genome is incorporated into the host cell genome.IV. Reverse transcriptase is activated.V. The lipid envelope of HIV fuses with the T cell membrane. What is the correct sequence of the numbered events? I > III > V > IV > II IV > II > I > V > III II > V > IV > III > I III > I > II > IV > Varrow_forwardThe envelope protein gp120 (Glycoprotein 120) is required for the attachment of the HIV virus to CD 4 receptors of target host cells. Identify the immune cells that consist of CD 4 receptors?arrow_forward
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- The high degree of mutation in HIV, the accumulation of variant viruses, and the development of resistance to drug regimes are attributed to _____. a. antigenic shift b. gene conversion c. absence of proofreading capability of reverse transcriptase d. antigenic variation of variable surface glycoproteins (VSGs) e. mutation of HIV RNA genome by host-cell RNA polymerase.arrow_forwardAfter HIV components are made, what is the correct order of thestages that produce mature HIV particles?a. Maturation, budding, assemblyb. Maturation, assembly, buddingc. Assembly, budding, maturationd. Assembly, maturation, buddingarrow_forwardA researcher performs an experiment where he infects 2 mice (Mouse A and Mouse B) with herpes simplex virus (HSV). To measure the cytotoxicity of CD8+ T cells from Mouse A, he isolates CD8+ T cells from Mouse A and co-cultures them with a mixture of HSV-infected spleen cells from Mouse B. A day later, he checks the co-culture, but none of the infected spleen cells from Mouse B have been killed. What could explain this observation? a.Mouse B does not express the invariant chain (Ii) b.Mouse A and Mouse B express different MHC alleles c.Mouse A does not express TLR2/6 d.HSV immunoevasins block MHC-II expressionarrow_forward
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