Cultured cells were treated with a compound in early Gap 1 (G₁) phase resulting to arrest before entering S phase. It was identified that similar checkpoint acts during G₁ phase to ensure that sufficient growth has occurred before the cells enter S phase. Which of the following was the most plausible mechanism of arrest? (A) Inhibition of Rb activity (B) Overproduction of E2F (C) Inhibition of DNA polymerase (D) Inhibition of G₁ cyclin transcription

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Viral Replication

The virus is acellular and considered non-living outside the host cell. The replication of the virus occurs only inside the living cells. Only a few genes are present in the smallest virus, whereas many genes are present in the largest virus. These genes encode specific viral proteins.