NEET BIOLOGY

BIOLOGICAL CLASSIFICATION

VIRUSES

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Once a virus gets into a cell, it
A
Releases its DNA or RNA to get to the nucleus
B
It begins to create DNA or RNA in the cell.
C
It destroys its own DNA and RNA in the cell.
D
None of the above
Explanation: 

Detailed explanation-1: -Virus enters cell by endocytosis. In the cytoplasm, the capsid comes apart, releasing the RNA genome. Replication and gene expression. The RNA genome is copied (this would be done by a viral enzyme, not shown) and translated into viral proteins using a host ribosome.

Detailed explanation-2: -In order to reproduce, an infecting virion enters the cell and traverses through the cytoplasm toward the nucleus. Using the cell’s own nuclear import machinery, the viral genome then enters the nucleus through the nuclear pore complex.

Detailed explanation-3: -Most DNA and few RNA viruses target their genome to the host nucleus. The crossing of nuclear membrane occurs in several ways :-RNA virus, dsDNA virus and lentivirus genomes enter via the nuclear pore complex (NPC) through the cellular Importin transport.

Detailed explanation-4: -The virus’s genome is uncoated from the protein and injected into the host cell. Then the viral genome hijacks the host cell’s machinery, forcing it to replicate the viral genome and produce viral proteins to make new capsids. Next, the viral particles are assembled into new viruses.

Detailed explanation-5: -Replication between viruses is greatly varied and depends on the type of genes involved in them. Most DNA viruses assemble in the nucleus while most RNA viruses develop solely in cytoplasm.

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