Pakistan MCQs

AIDS is the advanced stage of HIV infection.
Severe immune suppression permits opportunistic infections and cancers.

Reverse transcriptase copies viral RNA into DNA.
The viral DNA can then integrate into the host genome.

Retroviruses possess an RNA genome and use reverse transcriptase.
HIV is an important human retrovirus.

Retroviruses possess an RNA genome and use reverse transcriptase.
HIV is an important human retrovirus.

Retroviruses possess an RNA genome and use reverse transcriptase.
HIV is an important human retrovirus.

Enveloped viruses possess a lipid membrane acquired from host cells.
Non-enveloped viruses lack this outer lipid layer.

Enveloped viruses possess a lipid membrane acquired from host cells.
Non-enveloped viruses lack this outer lipid layer.

Enveloped viruses possess a lipid membrane acquired from host cells.
Non-enveloped viruses lack this outer lipid layer.

HIV binds mainly to CD4 receptors on helper T cells.
Progressive loss of these cells weakens adaptive immunity.

PCR uses repeated cycles of denaturation, primer binding, and extension.
It can produce millions of copies of target DNA.

PCR uses repeated cycles of denaturation, primer binding, and extension.
It can produce millions of copies of target DNA.

PCR uses repeated cycles of denaturation, primer binding, and extension.
It can produce millions of copies of target DNA.