Understanding AIDS and HIV Infection

The question asks us to identify the incorrect statement among the given options regarding AIDS (Acquired Immunodeficiency Syndrome).

Analyzing Each Statement about AIDS

Let's examine each statement carefully to determine which one is wrong:

• Statement 1: AIDS is an immunodeficiency disease.

  This statement is correct. AIDS is defined as a chronic, potentially life-threatening condition caused by the human immunodeficiency virus (HIV). It damages the immune system, interfering with the body's ability to fight infection and disease, hence it is an immunodeficiency disease.

• Statement 2: HIV selectively infects and kills B-lymphocytes.

  This statement is incorrect. HIV primarily infects and destroys helper T cells, also known as CD4+ T cells. These cells are crucial components of the immune system that coordinate the immune response. While other cells can be infected to a lesser extent, B-lymphocytes are not the primary target of HIV infection.

• Statement 3: Retrovirus have RNA genomes that replicate via DNA intermediate.

  This statement is correct. HIV is a type of virus called a retrovirus. Retroviruses are characterized by having an RNA genome and an enzyme called reverse transcriptase. They replicate by converting their RNA genome into double-stranded DNA inside the host cell, which is then integrated into the host cell's genome.

• Statement 4: Viral RNA is converted into DNA copy by reverse transcriptase.

  This statement is correct. As mentioned in the previous point, retroviruses like HIV use the enzyme reverse transcriptase to transcribe their RNA genome into DNA. This step is essential for the virus to integrate its genetic material into the host cell's DNA and replicate.

Identifying the Wrong Statement

Based on the analysis, statement 2 is the only incorrect statement. HIV primarily targets and damages helper T-lymphocytes (CD4+ T cells), not B-lymphocytes.