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Which stage of the HIV lifecycle involves the virus attaching to the host cell membrane?

A.

Binding

B.

Integration

C.

Fusion

D.

Reverse Transcription

Answer and Explanation

The Correct Answer is A

A. Binding is the initial step where the HIV virus attaches to the CD4 receptor on the host cell's surface. This interaction is crucial for the subsequent entry of the virus into the host cell.  
B. Integration occurs later in the lifecycle, after the virus has entered the host cell and its RNA is converted to DNA.  
C. Fusion refers to the process where the viral envelope fuses with the host cell membrane to allow entry into the cell, which follows the binding stage.  
D. Reverse Transcription is the process of converting viral RNA into DNA after the virus has entered the host cell, and is not involved in the attachment phase.
 


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Related Questions

Correct Answer is B

Explanation

A. Blood pressure does not increase during anaphylaxis; instead, it typically decreases due to vasodilation and fluid leakage.
B. During anaphylaxis, blood vessels become more permeable, leading to the release of fluids into the tissues, which causes swelling and contributes to hypotension.
C. Blood vessels do not constrict during anaphylaxis; rather, they dilate as a part of the allergic response, resulting in decreased blood pressure.
D. While there is an immune response during anaphylaxis, white blood cells are not destroyed; rather, they are activated to respond to the allergen, leading to inflammation and other systemic effects.

Correct Answer is A

Explanation

A. Binding is the initial step where the HIV virus attaches to the CD4 receptor on the host cell's surface. This interaction is crucial for the subsequent entry of the virus into the host cell.
B. Integration occurs later in the lifecycle, after the virus has entered the host cell and its RNA is converted to DNA.
C. Fusion refers to the process where the viral envelope fuses with the host cell membrane to allow entry into the cell, which follows the binding stage.
D. Reverse Transcription is the process of converting viral RNA into DNA after the virus has entered the host cell, and is not involved in the attachment phase.

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