10 Questions
What is the primary location where viruses replicate?
Inside the living cells of an organism
What are the main components of a viral particle?
Genetic material, protein coat, and sometimes an outside envelope of lipids
What is the size comparison between most virus species and bacteria?
Viruses are one-hundredth the size of most bacteria
What was the significant discovery made by Martinus Beijerinck in 1898?
"Discovery of the tobacco mosaic virus"
What is the study of viruses known as?
Virology
What are the major sites of lymphocytes in the lymph nodes?
B and T cells
What is the primary function of lymph nodes in the immune system?
Acting as filters for foreign particles including cancer cells
What refers to glands that are enlarged or swollen?
Lymphadenopathy
Where do lymphatic vessels leave and blood vessels enter and leave a lymph node?
At the hilum on the concave surface
What is the structure that surrounds each lymph node?
A fibrous capsule
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.
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.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
