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Difficulty: MediumViruses: Structure and Characteristics

Match each viral structural component in Column I with its corresponding biochemical nature or biological function in Column II.

  • CapsidProtein shell that encloses and protects the viral genetic genome
  • Viral EnvelopeLipid bilayer derived from the host cell membrane during budding
  • Tail FibersSpecialized protein appendages for attachment to specific bacterial surface receptors
  • CapsomereIndividual morphological protein subunit assembling the outer coat

Answer

The correct matches are: Capsid pairs with the protein shell that encloses and protects the viral genetic genome; Viral Envelope pairs with the lipid bilayer derived from the host cell membrane during budding; Tail Fibers pair with specialized protein appendages for attachment to specific bacterial surface receptors; and Capsomere pairs with individual morphological protein subunit assembling the outer coat.
Each viral component is defined by its distinct biochemical identity and function: the capsid is the protein coat enclosing genetic material, the viral envelope is a host-derived lipid membrane, tail fibers mediate host receptor recognition in bacteriophages, and capsomeres are the repeating protein units building the capsid shell.

Step-by-Step Solution

1
Identify the primary coat surrounding the viral genetic material.
The capsid serves as the main protective protein shell enclosing viral DNA or RNA.
Viruses possess a protein capsid to protect their nucleic acid genome from environmental enzymatic degradation.
2
Determine the biochemical nature of the viral envelope.
The envelope consists of host-derived phospholipids surrounding the capsid in certain viruses.
Enveloped viruses acquire membrane lipids directly from host cell plasma or organelle membranes during egress.
3
Relate tail fibers to host recognition in bacteriophages.
Tail fibers bind directly to cell surface receptors of host bacteria.
Viral host specificity relies on receptor-binding proteins located on structures like tail fibers.
4
Differentiate capsomeres from the complete capsid.
Capsomeres are the monomeric/oligomeric protein units forming the capsid.
Capsids are supramolecular assemblies built from repeating capsomere subunits.

Key Concept

Structure, chemical composition, and function of viral components
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Topics

Viruses: Structure and Characteristics

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