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Questions and Answers
What is the primary location where viruses replicate?
What is the primary location where viruses replicate?
What are the main components of a viral particle?
What are the main components of a viral particle?
What is the size comparison between most virus species and bacteria?
What is the size comparison between most virus species and bacteria?
What was the significant discovery made by Martinus Beijerinck in 1898?
What was the significant discovery made by Martinus Beijerinck in 1898?
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What is the study of viruses known as?
What is the study of viruses known as?
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What are the major sites of lymphocytes in the lymph nodes?
What are the major sites of lymphocytes in the lymph nodes?
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What is the primary function of lymph nodes in the immune system?
What is the primary function of lymph nodes in the immune system?
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What refers to glands that are enlarged or swollen?
What refers to glands that are enlarged or swollen?
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Where do lymphatic vessels leave and blood vessels enter and leave a lymph node?
Where do lymphatic vessels leave and blood vessels enter and leave a lymph node?
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What is the structure that surrounds each lymph node?
What is the structure that surrounds each lymph node?
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Study Notes
Viral Replication and Structure
- Viruses replicate inside the host cell's cytoplasm.
- A viral particle, also known as a virion, consists of genetic material (either DNA or RNA) and a protein coat called a capsid.
Size Comparison: Viruses and Bacteria
- Most virus species are smaller than bacteria, with diameters ranging from 20-400 nanometers compared to bacteria's 1-5 micrometers.
Discovery of Viruses
- Martinus Beijerinck discovered in 1898 that viruses are infectious agents that can reproduce only inside living cells.
Virology
- The study of viruses is known as virology.
Lymph Nodes
- Lymph nodes have major sites of lymphocytes, which are white blood cells that play a crucial role in the immune system.
- The primary function of lymph nodes is to filter the lymph and trap pathogens, such as bacteria and viruses, to prevent infection.
Lymphatic System
- Enlarged or swollen glands are referred to as lymphadenopathy.
- Lymphatic vessels leave and blood vessels enter and leave a lymph node through the hilum, a depression on the node's surface.
- Each lymph node is surrounded by a fibrous capsule, which provides structural support and protection.
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Description
Test your knowledge about the diversity and discovery of viruses in different ecosystems. Learn about the history of virus discovery and their impact on various life forms.
