Question

Question 11: What is the mechanism by which the AIDS virus causes deficiency of immune system of the infected person?

Class 12 - Biology - Human Health and Disease Page 164

Answer 1

the virus which enters the body attack the helper t-cells of the body. the virus has rna which is converted to dna by reverse transcriptase and this dna is inserted in the dna of the cell . so the next time when the cell replicates the viral dna also increases with this.

Answer 2

Answer:

AIDS (Acquired Immuno Deficiency Syndrome) is caused by the Human immunodeficiency virus (HIV)

Explanation:

AIDS (Acquired Immuno Deficiency Syndrome) is caused by the Human immunodeficiency virus (HIV) via sexual or blood-blood contact. After entering the human body, the HIV virus attacks and enters the macrophages. Inside the macrophages, the RNA of the virus replicates with the help of enzyme reverse transcriptase and gives rise to viral DNA. Then, this viral DNA incorporates into the host DNA and directs the synthesis of virus particles. At the same time, HIV enters helper T- lymphocytes. It replicates and produces viral progeny there. These newly formed progeny viruses get released into the blood, attacking other healthy helper Tlymphocytes in the body. As a result, the number of T-lymphocytes in the body of an infected person decreases progressively, thereby decreasing the immunity of a person.