Questions and Answers
What is the characteristic arrangement of capsomeres in a 2-helical structure?
Which type of capsomere arrangement is described as neither cubic nor helical?
What is the shape of a 2-helical capsomere arrangement?
What do capsomeres structurally represent in a capsid?
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Which of the following is NOT a characteristic of a 2-helical capsomere arrangement?
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What is the function of capsomeres in the viral structure?
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What term is used to describe a capsomere arrangement that is neither helical nor cubic?
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What is the relationship between capsomeres and polypeptides?
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What do capsomeres morphologically represent?
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What is the role of capsomeres in the viral capsid?
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Which of the following viruses has an icosahedral head and a helical tail?
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Which virus has a envelope with spikes?
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Which of the following viruses does not have an envelope?
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What is the shape of the head of the bacteriophage?
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Which of the following viruses is not icosahedral in shape?
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What is a critical factor in determining the stability of a viral protein?
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Which of the following is a key factor in the susceptibility of a viral protein to chemicals such as ether?
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What is the primary determinant of a viral protein's antigenic properties?
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Which of the following factors can affect the stability of a viral protein?
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What is a critical factor in the characterization of a viral protein?
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What is an important characteristic of a virus's capsid used in classification?
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Which of the following is not a characteristic used to classify viruses?
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What is the main purpose of classifying viruses?
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Which of the following viral components is NOT used in classification?
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Why is classification of viruses important?
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Study Notes
Viral Structure: Capsomeres and Capsid
- Capsomeres are the morphological units that form the capsid, composed of clusters of polypeptides.
- Capsomeres can be arranged in different ways, leading to distinct viral structures.
Capsid Arrangement
- 2-Helical capsid: capsomeres are arranged in a hollow coil that appears rod-shaped.
- 3-Complex capsid: capsomeres are arranged in a more complex structure that is neither cubic nor helical.
Viral Shapes and Components
- Icosahedral shape: found in viruses such as bacteriophages, herpes simplex virus, polio virus, and HIV.
- Helical shape: found in the tails of some viruses, such as bacteriophages.
- Enveloped viruses: have a lipid bilayer that surrounds the capsid, found in viruses such as herpes simplex virus and HIV.
- Unenveloped viruses: do not have a lipid bilayer, found in viruses such as polio virus.
- Spikes on envelope: found in viruses such as HIV.
Viral Classification
- Capsid characteristics: symmetry, size, and whether it is enveloped or not, are used in virus classification.
- Other viral components used in classification include:
- Molecular mass
- pH stability
- Thermal stability
- Susceptibility to chemicals
- Antigenic properties
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Description
Learn about capsomeres, the morphological units that form the capsid and represent clusters of polypeptides. Understand their structure and function in virology.
