BIOLOGICAL CLASSIFICATION
VIRUSES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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makes nucleic acids
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attach directly to host
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compresses to expel viral DNA or RNA into host cell
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makes attachment proteins
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Detailed explanation-1: -A major reason for such high infection efficiency is a specialized organelle called a tail. It is present in about 96% of all bacteriophages and is designed to attach to bacteria, to penetrate their cell walls and to deliver the viral genome into the host (Ackermann, 2006).
Detailed explanation-2: -It starts with the virus finding and binding the corresponding receptors on the host cell. After the strong contact is established, the cellular membrane is pierced and the viral DNA is eventually ejected into the host cell.
Detailed explanation-3: -Lytic cycle Entry: The phage injects its double-stranded DNA genome into the cytoplasm of the bacterium. DNA copying and protein synthesis: Phage DNA is copied, and phage genes are expressed to make proteins, such as capsid proteins.
Detailed explanation-4: -Tail fibers are responsible for the specific, albeit reversible primary attachment to host cell. Due to high selective pressure, tail fiber genes evolve more rapidly than other phage genes and exchanges occur via horizontal transfer among phages crossing host phylogenetic boundaries .