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 biology classification and variation dna - history and structure biotechnology commercial applications of biotechnology

Identify the odd from the following ;

  1. $\alpha$ - Interferon

  2. oncogenic virus

  3. proto - oncogenes

  4. UV rays
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • The oncogenic virus, proto - oncogenes and UV are involved in the cancer formation; when infected or stimulated have the cancer causing ability.
  • Biological response modifiers such as α-interferon activates the
immune system and helps in destroying the tumor.
So, the correct option is 'α-interferon'.
Multiple choice biology classification and variation dna - history and structure biotechnology commercial applications of biotechnology

An antiviral protein released from infected and dying cells is

  1. Antigen.

  2. Antibody.

  3. Antiserum.

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

Interferons are proteinaceous in nature. These are released by the virally infected and dying cells as a response to the attack. Interferons are named for their ability to interfere with viral replication by protecting cells from virus infections. It induces antiviral mechanism in the neighbouring cells. 

Thus, the correct answer is option D.

Multiple choice biology classification and variation dna - history and structure biotechnology commercial applications of biotechnology

An antiviral protein released from infected and dying cells is

  1. antigen

  2. antibody

  3. antiserum

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

Interferon is the name given to a group of proteins known primarily for their role in inhibiting viral infections and in stimulating the entire immune system to fight disease. Research has also shown that these proteins play numerous roles in regulating many kinds of cell functions. Interferons can promote or hinder the ability of some cells to differentiate, that is, to become specialized in their function. They can inhibit cell division, which is one reason why they hold promise for stopping cancer growth. Recent studies have also found that one interferon may play an important role in the early biological processes of pregnancy. Although once thought to be a potential cure-all for a number of viral diseases and cancers, subsequent research has shown that interferons are much more limited in their potential. 


So, the correct option is 'Interferon'.

Multiple choice biology classification and variation dna - history and structure biotechnology commercial applications of biotechnology

Read the following statements and select the option which identify the incorrect ones:
(i) Potato spindle tuber disease and Chrysanthemum stunt disease are caused by viroids.
(ii) $T _4$ bacteriophage exhibits lytic cycle.
(iii) Retroviruses have two copies of ssRNA.
(iv) Interferon which prevent viral multiplication are glycolipid particles.

  1. (ii) and (iii)

  2. (i) and (iv)

  3. (iii) only

  4. (iv) only
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Interferons are a group of proteins called cytokines produced by WBC, fibroblasts, or T-cells as part of an immune response to a viral infection or other immune triggers. Interferons are proteinaceous in nature but not glycolipid in nature, thus interferon which prevents viral multiplication are protein particles.

So, the correct option is 'Interferon which prevents viral multiplication are glycolipid particles.'.

Multiple choice sexually transmitted diseases stds and infertility reproductive health reproduction biology

Which of the following is correct regarding HIV, hepatitis B, gonorrhoea, trichomoniasis?

  1. Trichomoniasis is an STD whereas others are not.

  2. Gonorrhoea is a viral disease whereas others are bacterial.

  3. HIV is a pathogen whereas others are diseases.

  4. Hepatitis B is eradicated completely whereas others are not.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

HIV is Human Immunodeficiency Virus that causes AIDS. Hepatitis-B is a viral disease and it has not been eradicated yet. Gonorrhoea is a bacterial disease. Trichomoniasis is a protozoan disease.

Multiple choice sexually transmitted diseases stds and infertility reproductive health reproduction biology

All of the following sexually transmitted diseases are curable if detected early except

  1. Hepatitis B

  2. Genital herpes

  3. Syphilis

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

AIDS, which is caused by the HIV virus, attacks the immune system, making it weak, hence the individual suffers from many different types of diseases. Also in the early stages of the disease, very little or no symptoms, like a headache, fever, fatigue and sore throat appear, which is misunderstood for some kinds of flu.  

So the correct option is  'AIDS'. 

Multiple choice sexually transmitted diseases stds and infertility reproductive health reproduction biology

The most common sexually transmitted disease is 

  1. HIV

  2. HPV

  3. Herpes

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

Tricomoniasis is one of the most common type of sexually transmitted disease , caused by a parasite . While HIV , HPV & Herpes can be spread by causes other than unprotected sex with infected person .

So the correct option is 'Tricomoniasis'  . 

Multiple choice botany option b: biotechnology and bioinformatics dna transfer rdna technology - dna transfer and transformation biotechnology in agriculture

Which of these is used as vector in gene therapy for SCID?

  1. Arbovirus

  2. Rotavirus

  3. Enterovirus

  4. Parvovirus

  5. Retrovirus
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

In gene therapy trials, the retrovirus is used as a vector to treat X-linked severe combined immunodeficiency (X-SCID) represent the most successful application of gene therapy. The retrovirus genetic material is in the form of RNA molecules, and their hosts genetic material is in the form of DNA. When a retrovirus infects a host cell, it will introduce its RNA together with some enzymes, namely reverse transcriptase and integrase, into the cell. This RNA molecule from the retrovirus must produce a DNA copy from its RNA molecule before it can be integrated into the genetic material of the host cell. The process of producing a DNA copy from an RNA molecule is termed reverse transcription.

Multiple choice zoology genetics of the future gene therapy application of biology in therapy and vaccine gene cloning
Assertion : Genital herpes cannot be cured if recurrent.
Reason : Genital herpes can be inhibited by acyclovir.

  1. Both the Assertion and the Reason are true and the Reason is a correct explanation of the Assertion.

  2. Both the Assertion and Reason are true but the Reason is not a correct explanation of the Assertion.

  3. The Assertion is true but the Reason is false.

  4. Both the Assertion and Reason are false.

  5. The Assertion is false but Reason is true.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

An antiviral drug is used to treat genital herpes outbreaks stay symptom-free longer. These drugs can also reduce the severity and duration of symptoms when they do flare up. Drug therapy is not a cure, but it can make living with the condition easier. Because of lack of research about the Herpes virus action mechanism, there is no cure for Herpes but it is inhibited by acyclovir. It is one of the most common sexually transmitted infections. 

Multiple choice biology biology : an introduction introduction to organization of life signs of life what is living?

Which of the following characteristic is absent in viruses?

  1. Mutation

  2. Replication

  3. Production of energy

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

Viruses are obligate parasites. They are acellular and are only made of a genetic material surrounded by a protein capsid. Viruses use the host cellular machinery for survival and replication. They also undergo mutation within the host. They have no energy metabolism nor do they produce waste products. Hence they are considered non-living. Thus the correct answer is option C.