Biology ยท 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

Which among the following statements regarding interferons is correct?

  1. They are found only in mammalian species.

  2. They are divided into 5 main families.

  3. They induce enzyme synthesis in the target cell.

  4. They only affect infected cells.

  5. They are specific for individual viruses.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Derepression of genes in the target cell results in the synthesis of a protein, kinase and an endonuclease.

Multiple choice

The same drug can work for both bacteria and virus.

  1. The above statement is correct

  2. The above statement is not correct

  3. The above statement is sometimes correct and sometimes in-correct.

  4. Can't say whether this statement is correct or not.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Antibiotics are effective against bacteria but do not work against viruses, as viruses lack the cellular machinery that antibiotics target.

Multiple choice

Which of the following statements is correct.

  1. Communicable diseases can spread.

  2. Malaria is not a communicable disease.

  3. AIDS is not a communicable disease.

  4. All the above.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Communicable diseases are infectious diseases that can spread from one person to another. Malaria and AIDS are both communicable diseases, making options B and C incorrect.

Multiple choice

Virus lives _______ the cells.

  1. outside

  2. inside

  3. on

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

Viruses are obligate intracellular parasites, meaning they must invade and live inside host cells to replicate.

Multiple choice

AIDS virus can spread through

  1. blood to blood contact with the infected people

  2. infected mother to baby during pregnancy

  3. brest feeding a child

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

HIV/AIDS is transmitted through the exchange of specific bodily fluids, including blood, breast milk, and during pregnancy or childbirth from mother to child. All listed methods are recognized pathways for transmission.

Multiple choice

HIV virus can spread through ________ all over the body.

  1. blood

  2. lymph nodes

  3. nerves

  4. tissues
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

HIV primarily targets and replicates within the immune system, specifically infecting CD4 T cells. These cells are found throughout the body, but the virus is highly concentrated in the lymph nodes, which serve as reservoirs for the infection.

Multiple choice

Antibiotics destroy or inhibit

  1. bacteria, fungi and viruses

  2. bacteria, algae and viruses

  3. bacteria and fungi

  4. bacteria and viruses
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Antibiotics are substances that inhibit the growth of or destroy microorganisms, specifically bacteria and fungi. They are ineffective against viruses, which require antivirals.

Multiple choice

HIV is known as

  1. Human immune virus.

  2. Human immunodeficiency virus.

  3. Human immunal viral

  4. Human immuno virus
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

HIV stands for Human Immunodeficiency Virus, which reflects its nature of weakening the immune system.

Multiple choice

AIDS virus parasitizes ____________.

  1. helper T cells

  2. B cells

  3. A cells

  4. All of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The HIV virus specifically targets and destroys CD4+ helper T cells, which are crucial for the immune system to function correctly.

Multiple choice

A virus that can reproduce without killing its host is called a

  1. Retroactive virus

  2. Lytic virus

  3. Virion

  4. Temperate virus
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Certain viruses, particularly bacteriophages, are called temperate (or latent) because the infection does not immediately result in cell death. The viral genetic material remains dormant or is actually integrated into the genome of the host cell.

Multiple choice

The functioning of which system of our body is damaged during the HIV infection.

  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 (Human Immunodeficiency Virus) specifically targets and destroys CD4 positive T cells, which are a crucial component of the human immune system. This leads to a weakened immune system, making the body susceptible to opportunistic infections.

Multiple choice

The AIDS virus does not spread through _________.

  1. infected mother to baby during pregnancy

  2. breastfeeding from an infected female

  3. blood to blood contact with infected person

  4. handshaking
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

HIV is not transmitted through casual contact such as handshaking, hugging, or sharing utensils.