Biology · General Awareness

Viral Diseases and Immunity

776 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

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

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

Which antigenic particle present in the serum of individuals infected with the virus hepatitis B, contains both DNA and DNA polymerase?

  1. p7 nucleocapsid protein

  2. A spherical 22 nm particle

  3. Dane particle

  4. Tubular or filamentous 22 nm particle

  5. GP 120 envelope protein
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The virus particle consists an outer lipid envelope and an icosahedral nucleocapsid core composed of protein. These virions are 42 nm in diameter and are sometimes referred to as Dane particles. This is known as the Dane particle as it was discovered by Dane in 1970. The nucleocapsid encloses the viral DNA and a DNA polymerase that has reverse transcriptase activity.

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.