Tag: immunity related disorders and problems

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Questions Related to immunity related disorders and problems

Multiple choice zoology infectious diseases cancer and aids hiv and aids immunity related disorders and problems

The human immuno deficiency virus (HIV) is a living entity because it can

  1. Undergoes reproduction in the host cell

  2. Disturb host cell respiration

  3. Excrete in human serum

  4. Move from one cell to another
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
HIV infects a type of white blood cell in the body’s immune system called a T-helper cell (also called a $CD _4$ cell). These vital cells keep us healthy by fighting off infections and diseases. HIV cannot grow or reproduce on its own. Instead, the virus attaches itself to a T-helper cell and fuses with it. It then takes control of the cell’s DNA, replicates itself inside the cell, and finally releases more HIV into the blood – continuing the multiplication process. This is the HIV life cycle. 
So the correct option is 'Undergoes reproduction in the host cell'
Multiple choice zoology infectious diseases cancer and aids hiv and aids immunity related disorders and problems

At which stage of HIV infection does on usually show symptoms of AIDS?

  1. When the infecting retrovirus enters host cells

  2. When vital DNA is produced by reverse transcriptase

  3. When HIV replicates rapidly in helper T-lymphocytes and damage large number of these
  4. Within $15$ days of sexual contact with an infected person
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Symptoms of AIDS typically manifest when HIV replicates extensively and destroys a critical mass of helper T-lymphocytes (CD4+ T cells), severely compromising the immune system and leading to opportunistic infections.

Multiple choice biology blood circulation cancer and aids hiv and aids immunity related disorders and problems

AIDS is caused by

  1. Corynebacterium diphtheriae

  2. Human immuno deficiency virus

  3. Rubella virus

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

Corynebacterium diphtheriae is a virus causing diphtheria. 
Rubella virus causes measles. 
Varicella virus causes chickenpox.
Human immunodeficiency virus infection is a disease of human immune system, which causes acquired immune deficiency syndrome. It is transmitted through sexual contact, breastfeeding and blood transfusion.
Thus, the correct answer is option B.

Multiple choice biology blood circulation cancer and aids hiv and aids immunity related disorders and problems

AIDS can be transmitted through

  1. Blood transfusion

  2. Hand shake

  3. Courtship

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

HIV (Human Immunodeficiency Virus) is the causative agent of AIDS. HIV is spread from an infected person to another person through direct contact with some of the body’s fluids like mother milk, blood, lymph and semen through sexual intercourse or by sharing the drug equipment like needles or from mother to child during childbirth or breastfeeding or via blood transfusion.
Thus, the correct answer is option A.

Multiple choice biology blood circulation cancer and aids hiv and aids immunity related disorders and problems

Who discovered ''reverse transcription''?

  1. Watson and Crick

  2. Beadle and Tatum

  3. Temin and Baltimore

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

Reverse transcriptase is an enzyme used to produced complementary strand of RNA, called as cDNA. This process occurs in RNA viruses. It was discovered by Howard Temin at the University of Wisconsin–Madison in RSV virions and independently isolated by David Baltimore in 1970 at MIT from RNA tumour viruses such as R-MLV and RSV. In 1975 Nobel Prize was awarded in Physiology or Medicine to both of them along with Renato Dulbecco. 

Hence, the correct answer is option C.

Multiple choice biology blood circulation cancer and aids hiv and aids immunity related disorders and problems

AIDS was first reported in U.S.A in

  1. 1981

  2. 1971

  3. 1984

  4. 1986
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

  • AIDS(acquired immunodeficiency syndrome) is caused by the HIV virus. It breaks down the body immune system, leaving the patient vulnerable to a host of life-threatening opportunistic infections.
  • The first AIDS cases were reported in the United States in June 1981.
  • Hence AIDS was first reported in U.S.A in 1981.
  • So, the correct answer is '1981'.