Viral Replication and Host Interaction

This video tutorial covers the processes of viral replication, focusing on the lytic and lysogenic cycles. It explains how viruses, lacking organelles, must enter host cells to replicate. The lytic cycle involves the virus taking over the host's cellular machinery to produce more viruses, eventually causing the cell to burst. In contrast, the lysogenic cycle involves the virus integrating into the host's genome, remaining dormant until conditions trigger its activation. The tutorial provides a comprehensive understanding of these cycles, highlighting the differences and implications for host cells.

Why do viruses need to enter host cells?

• To change their genetic material

• To hide from the immune system

• To use the host's ATP and organelles for replication

• To obtain nutrients

Which method do bacteriophages use to enter host cells?

• Fusion with the cell membrane

• Injection of genetic material

• Endocytosis

• Engulfment by the host cell

How do non-enveloped viruses typically enter host cells?

• By fusing with the cell membrane

• By breaking the cell wall

• By tricking cell receptors

• By being engulfed by the cell

What is the first step in the lytic cycle?

• Integration into the host genome

• Release of new viruses

• Replication of viral genetic material

• Fusion with the host cell membrane

What happens to the host cell at the end of the lytic cycle?

• It becomes dormant

• It integrates viral DNA

• It bursts and releases new viruses

• It repairs its DNA

In the lysogenic cycle, what is the virus called when it integrates into the host genome?

• Lytic virus

• Dormant virus

• Provirus or prophage

• Latent virus

What happens to the viral genetic material during the lysogenic cycle?

• It is destroyed by the host cell

• It remains dormant within the host genome

• It forms a new virus

• It immediately starts replicating

What triggers a lysogenic virus to enter the lytic cycle?

• Exposure to ultraviolet light

• Lack of nutrients

• High temperature

• Presence of other viruses

What is the official name for the impatient viral replication method?

• Prophage cycle

• Dormant cycle

• Lytic cycle

• Lysogenic cycle

What is the official name for the viral replication method that involves integration into the host genome?

• Lysogenic cycle

• Lytic cycle

• Dormant cycle

• Prophage cycle