Biology · General Awareness

Viral Diseases and Immunity

807 Questions

Viral diseases and immunity cover the structure, transmission, and diagnosis of viruses like HIV. Questions focus on disease pathways, immune responses, and prevention. Strong knowledge here provides an edge in biology scoring.

HIV and AIDS structureVirus transmission methodsImmune system deficiencyPathogen risk groupsMedical diagnosis methods

Viral Diseases and Immunity Questions

Multiple choice

AIDS virus has

  1. single stranded DNA

  2. double stranded DNA

  3. double stranded RNA

  4. None of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The HIV virus, which causes AIDS, is a retrovirus that contains single-stranded RNA as its genetic material, not DNA.

Multiple choice

Which of the following statements about hepatitis B is false?

  1. It is more common in cold countries as compared to warm countries.

  2. If occurring in neonates, it will lead to a carrier state.

  3. HBV is transmitted by sharing needles.

  4. HBV has an incubation period of about 70 days.

  5. It is accompanied by an increased risk of hepatocellular carcinoma.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Very common in Asia and the far East as well as tropical Africa, where 35% of the population carry HBV whereas the rate is much lower in Northern Europe.

Multiple choice

Hepatitis A is a highly contagious liver infection caused by the hepatitis A virus. Which one of the following is a true statement about hepatitis A? 

  1. In developed countries, it is mainly a disease of the old.

  2. It has an incubation period of about 100 days.

  3. It is spread by the faecal-oral route.

  4. It is associated with HLA-B8, -DR3.

  5. It is best diagnosed by finding IgG-specific antibody to hepatitis A.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Contaminated water is the most common source.

Multiple choice

Directions: Read the following information and answer the given question.

Two HIV infected siblings Anu and Sumit were expelled from their school. They were not feeling well from the last few months. Only after the intervention of an NGO were they readmitted.

What is the mode of transmission of this disease?

  1. Transfusion of infected blood

  2. Playing with infected children

  3. From the bite of Anopheles mosquito

  4. Shaking hands with an infected person
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

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Multiple choice

Provirus is a

  1. a free virus

  2. primitive virus

  3. integrated viral genome

  4. a free DNA

  5. -
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Provirus is the genetic material of a virus as it is incorporated into and is able to replicate with the genome of a host cell.

Multiple choice

Enveloped virus enters the host cell by

  1. injecting its own nucleic acid inside host cell

  2. contact with cell receptor and endocytosis

  3. phagocytosis

  4. the fusion of plasma membrane with host

  5. -
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Correct Answer: injecting its own nucleic acid inside host cell

Multiple choice

HIV infection damages the functioning of

  1. nervous system

  2. respiratory system

  3. immune system

  4. muscular system
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

HIV causes Acquired Immuno Deficiency Syndrome (AIDS). As the name suggests, the immune system becomes weak in this disease. Due to this, the person falls prey to many other infections like common cold or diarrhoea. Thus, as a consequence, the person’s nervous, respiratory, muscular or any other system may be affected later on.

Multiple choice

Human immunodeficiency virus causes

  1. acquired immunodeficiency syndrome

  2. anthrax

  3. tuberculosis

  4. polio

  5. -
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Acquired immune deficiency syndrome or acquired immunodeficiency syndrome (AIDS) is a syndrome that is caused by a virus called HIV (Human immunodeficiency virus).

Multiple choice

ELISA test is used for the detection of

  1. antibodies

  2. viral diseases

  3. AIDS

  4. All of these

  5. -
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

ELISA (enzyme-linked immunosorbent assay) is a test that detects and measures antibodies in our blood. This test can be used to determine if you have antibodies that are related to certain infectious conditions, such as AIDS or any viral disease.

Multiple choice

AIDS Is ___ fatal disease

  1. (A) A

  2. (B) AN

  3. (c) THE

  4. (D)NO ARTICLE
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

correct AIDS is disease and no article is used for it any zoo, village, city, street, Bus stand, Railway stand, Airport, Underground tonal, diseases and true sayings or thoughts no Article is used.

Multiple choice

What is the full form of HIV?

  1. Human Immuno Virus

  2. Human Immune Supplement Virus

  3. Human Immuno Deficiency Virus

  4. Human Immunity Viral Infection
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

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Multiple choice

What is the carrier state of an individual who has recovered from an infectious disease but continues to harbour large number of the pathogens?

  1. Convalescent carrier

  2. Incubatory carrier

  3. Healthy carrier

  4. Active carrier

  5. Chronic carrier
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Convalescent carrier is a person who has recovered from the symptoms of an infectious disease but is still capable of transmitting pathogens to others. Persons in this category are the most frequent source of infection for others.

Multiple choice

How many external spikes are present in the enveloped structure of the HIV virion?

  1. 72

  2. 71

  3. 70

  4. 69

  5. 68
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

HIV-1 virus is made up of protein envelope and two copies of single stranded RNA of the genome. The envelope contains 72 external spikes. This spike is made up from the glycoproteins GP120 and GP41. Here GP stands for glycoprotein and the number refers the mass of protein. GP120 is present in external spike and GP41 is in transmembrane.