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Chapter 1: Problem 1

Why are viruses considered obligate intracellular parasites?

Short Answer

Expert verified
Viruses are considered obligate intracellular parasites because they require a host cell's machinery for reproduction.

Step by step solution

01

Define 'Obligate Intracellular Parasites'

Obligate intracellular parasites are organisms that cannot reproduce outside their host cell, meaning their reproduction is entirely reliant on intracellular resources.
02

Explain Characteristics of Viruses

Viruses are made up of genetic material (either DNA or RNA) enclosed in a protein coat. They lack cellular machinery necessary for metabolism and reproduction.
03

Describing How Viruses Replicate

Viruses must infect a host cell, hijacking the host's cellular machinery to replicate. Without a living host cell, viruses cannot produce proteins or replicate their genetic material.
04

Relate Virus Activity to the Definition

Given that viruses depend on host cells for reproduction and survival, they fit the definition of obligate intracellular parasites perfectly.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Viral Replication
Viruses need a host cell to reproduce. Their replication cycle involves a few essential steps:
First, the virus attaches to the host cell and injects its genetic material. This genetic material can either be DNA or RNA.
Next, the viral genetic material takes over the host cell's machinery. It uses the cell's resources to create viral proteins and replicate its genetic material.
Eventually, new virus particles are assembled inside the host cell.
Lastly, the new viruses are released from the host cell, sometimes causing the cell to burst (lyse). This process is how viruses spread and infect other cells.
Virus-Host Interaction
When a virus interacts with a host cell, it does more than just infect it. The interaction is very specific:
Viruses have specialized structures like proteins on their surface that match receptors on the host cell. This is why certain viruses can only infect specific types of cells or species.
After attachment, the virus penetrates the cell.
The host cell often suffers as a result. The hijacking of cellular machinery can divert resources away from normal cellular functions.
This can lead to cell damage or cell death. Understanding these interactions is crucial for developing antiviral strategies.
Viral Structure
Viruses are simpler than cells but highly effective in their design. They consist of:
Genetic material: This can be either DNA or RNA, and can be single-stranded or double-stranded.
Protein coat: Also called the capsid, this protects the genetic material and helps the virus attach to host cells.
Some viruses have an outer lipid envelope derived from the host cell's membrane.
Each component plays a key role in the virus's ability to infect host cells and replicate.
This structure is why they can be so efficient at spreading infection, even though they lack most cellular machinery.

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