The two main processes by which viruses penetrate host cells are endocytosis and direct fusion.

1. Endocytosis (Engulfment): This is a process where the virus is engulfed or 'eaten' by the host cell. The virus attaches itself to the host cell's surface. The cell membrane of the host then wraps around the virus creating a vesicle, a small bubble-like structure inside the cell. The virus is now inside this vesicle within the host cell. The vesicle then transports the virus into the cell where it can begin to replicate.

2. Direct Fusion: In this process, the virus merges directly with the host cell. The virus attaches to the host cell and the outer layer of the virus, known as the viral envelope, fuses with the cell membrane of the host. This fusion allows the virus to release its genetic material directly into the host cell, initiating the process of infection.

These are the two primary ways that viruses can enter host cells and begin the process of infection.

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The two main processes by which viruses penetrate host cells are endocytosis and direct fusion.

1. Endocytosis (Engulfment): This is a process where the virus is engulfed or 'eaten' by the host cell. The virus attaches itself to the host cell's surface. The cell membrane of the host then wraps around the virus creating a vesicle, a small bubble-like structure inside the cell. The virus is now inside this vesicle within the host cell. The vesicle then transports the virus into the cell where it can begin to replicate.

2. Direct Fusion: In this process, the virus merges directly with the host cell. The virus attaches to the host cell and the outer layer of the virus, known as the viral envelope, fuses with the cell membrane of the host. This fusion allows the virus to release its genetic material directly into the host cell, initiating the process of infection.

These are the two primary ways that viruses can enter host cells and begin the process of infection.

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The two main processes by which viruses penetrate host cells are endocytosis and direct fusion.

1. Endocytosis (Engulfment): This is a process where the virus is engulfed or 'eaten' by the host cell. The virus attaches itself to the host cell's surface. The cell membrane of the host then wraps around the virus creating a vesicle, a small bubble-like structure inside the cell. The virus is now inside this vesicle within the host cell. The vesicle then transports the virus into the cell where it can begin to replicate.

2. Direct Fusion: In this process, the virus merges directly with the host cell. The virus attaches to the host cell and the outer layer of the virus, known as the viral envelope, fuses with the cell membrane of the host. This fusion allows the virus to release its genetic material directly into the host cell, initiating the process of infection.

These are the two primary ways that viruses can enter host cells and begin the process of infection.

The two principal processes by which viruses penetrate host cells are (engulfment) and direct fusion.

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