NEET BIOLOGY

BIOLOGICAL CLASSIFICATION

VIRUSES

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
What is the first step of the virus reproduction cycle?
A
The viruses genetic material (DNA) starts to take over the functions of the cell
B
The host cell bursts open, releasing the new viruses
C
The virus injects its genetic material into the cell
D
A virus attaches to the surface of a host cell
Explanation: 

Detailed explanation-1: -The first stage is entry. Entry involves attachment, in which a virus particle encounters the host cell and attaches to the cell surface, penetration, in which a virus particle reaches the cytoplasm, and uncoating, in which the virus sheds its capsid.

Detailed explanation-2: -Step 1: Attachment: The virus attaches itself to the target cell. Step 2: Penetration: The virus is brought into the target cell. Step 3: Uncoating and Replication: The enveloped virus loses its envelope, and viral RNA is released into the nucleus, where it is replicated. Step 4: Assembly: Viral proteins are assembled.

Detailed explanation-3: -The viral life cycle can be divided into several major stages: attachment, entry, uncoating, replication, maturation, and release.

Detailed explanation-4: -Replication: The virus takes over the cell’s metabolism, causing the creation of new proteins and nucleic acids by the host cell’s organelles. Assembly: Proteins and nucleic acids are assembled into new viruses. Release: Virus enzymes cause the cell to burst and viruses are released from the host cell.

Detailed explanation-5: -A. Viral Attachment. The first step in virus entry is the attachment of the viral particle to the surface of a target cell. Viruses can bind to a variety of molecules on the cell surface, including membrane proteins, polysaccharides, and lipids.

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