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HIV (Medical Entrance)

Description: Proteins
Number of Questions: 15
Created by:
Tags: HIV AID and Cancer -- Causes and Control AIDS Cancer
Attempted 0/15 Correct 0 Score 0

Which of the following genes codes for gp120 protein in HIV capsid?

  1. gag gene

  2. pol gene

  3. env gene

  4. tat gene


Correct Option: C
Explanation:

env gene codes for a protein called gp160 in HIV capsid that is broken down by a cellular protease to form gp120 and gp41.

What kind of genome does HIV virus contain?

    • sense ss RNA
    • sense ss RNA
    • sense ds RNA
  1. ss DNA virus


Correct Option: B
Explanation:

HIV is composed of two copies of positive single-stranded RNA that codes for the virus's nine genes enclosed by a conical capsid composed of 2000 copies of the viral protein.

By which mechanism do abortively infected cells undergo programmed cell death?

  1. Apoptosis

  2. Necroptosis

  3. Pyroptosis

  4. Anoikis


Correct Option: C
Explanation:

Pyroptosis is a form of programmed cell death associated with antimicrobial responses during inflammation. In this process, abortively infected cells that recognize certain danger signals within themselves produce cytokines, swell, burst and die.

Which of the following primers is required for HIV-1 reverse transcriptase?

  1. Trp tRNA primer

  2. Pro tRNA primer

  3. Lys3 tRNA primer

  4. Lys 1.2 tRNA primer


Correct Option: C
Explanation:

Lys tRNA primer specifically tRNA lys3 is the primer for HIV-1 reverse transcriptase.

Which enzyme cleaves gp160 inside the host cell?

  1. Capsid protein

  2. HIV-1 protease

  3. Furin protein

  4. P6 protein


Correct Option: C
Explanation:

Furin protein is one of the proteases responsible for the proteolytic cleavage of HIV envelope polyprotein precursor gp160 to gp120 and gp41 prior to viral assembly.

Which of the following genes does not code for accessory regulatory protein of HIV?

  1. vpu gene

  2. vpr gene

  3. rev gene

  4. nef gene


Correct Option: C
Explanation:

rev is an essental regulatory arrangement important for the synthesis of major viral proteins and is hence essential for viral replication.

Which strains exclusively use CxCR4 receptors for entry into host cells?

  1. Dual tropic strains

  2. M-tropic strains

  3. T-tropic strains

  4. All of the above


Correct Option: C
Explanation:

T-tropic strains replicate in primary CD4+ T-cells as well as in macrophages and use the alpha-chemokine receptor, CXCR4, for entry into cells.

Which of the following regulatory proteins is involved in CD4 degradation involving ubiquitin proteosome pathway?

  1. vpr

  2. vif

  3. vpu

  4. nef


Correct Option: C
Explanation:

vpu (virus protein U) is involved in CD4 degradation involving the ubiquitin proteosome pathway as well as in the successful release of virions from infected cells.

What are people with Δccr5 mutation resistant to?

  1. T-tropic isolates

  2. R5 viruses

  3. Dual tropic virus

  4. All retroviruses


Correct Option: B
Explanation:

People with Δccr5 mutation are resistant to R5 viruses because these viruses use CCR5 receptors for entry into the cell.

Which of the following is a circulating recombinant form of West African and Central European sub-types of HIV?

  1. CRF02_AG

  2. CRF01_AE

  3. CRF12_BF

  4. CRF04_cpx


Correct Option: A
Explanation:

CRF02_AG is a circulating recombinant form of West African and Central European sub-types of HIV.

What is the role of viral infectivity factor?

  1. Regulating nuclear import

  2. Disruption of enzyme APOBEC

  3. Establishment of infection

  4. Cleaving newly synthesized polyproteins


Correct Option: B
Explanation:

Viral infectivity factor (vif)'s role is to disrupt the antiviral activity of the human enzyme APOBEC by targeting it for ubiquitination and cellular degradation. APOBEC is a cytidine deaminase enzyme that mutates viral nucleic acids.

Which test needs to be conducted to detect the acute infection of HIV-1 or its absence if both HIV-1 and HIV-2 antibody tests are negative?

  1. Western blot

  2. Immunofluorescence test (IFA)

  3. ELISA test

  4. Nucleic acid test


Correct Option: D
Explanation:

If HIV-1 (-) or indeterminate and HIV-2 (-) are there, nucleic acid test must be carried out to detect the acute infection of HIV-1 or its absence.

How long does an untreated patient infected with HIV virus live?

  1. 1 year

  2. 9-11 years

  3. 5-6 years

  4. More than 30 years


Correct Option: B
Explanation:

Untreated HIV patient dies within 9-11 years due to AIDS.

Which are the first cells of the body to encounter HIV infection?

  1. Macrophages

  2. CD4+ T-cells

  3. Myeloid dendritic cells

  4. B-cells


Correct Option: A
Explanation:

Macrophages are the first cells infected by HIV.

Which group of HIV-1 predominates the AIDS pandemic?

  1. Group N

  2. Group O

  3. Group M

  4. Group P


Correct Option: C
Explanation:

Group M HIV-1 predominates the AIDS pandemic. It is the most common type of HIV, with more than 90% of HIV/AIDS cases.

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