Viruses Living - Fundamentals of Biology - Lecture Slides, Slides of Biology

Download Viruses Living - Fundamentals of Biology - Lecture Slides and more Slides Biology in PDF only on Docsity! Are viruses living or non-living? • The lack the ability to reproduce on their own. • They cannot transform their own energy. • The lack cell membranes, nucleus and cell organelles. • They are dormant unless in contact with a host cell. • You make the decision!!! Docsity.com Viruses Come In Many Shapes • All viruses have a capsid made of protein that encloses a central core of either DNA or RNA. • There are three basic groups of viruses: bacterial, plant and animal. Docsity.com VIRUS TYPES ° TMV Herpes II ° Polio Rabies Rabies ¥itus ad Hepatiti Docsity.com What was the first identified virus? • In 1933 Wendall Stanley of the Rockefeller Institute purified an extract of tobacco mosaic virus which caused discoloration of tobacco leaves. Docsity.com Bacteriophages • These are viruses that infect bacteria. • They are large in size. • All are virulent and multiply within a host cell. Docsity.com What is a retrovirus? • Retroviruses have a core of RNA. • The RNA enters the host and forms DNA. • HIV virus is an example of a retrovirus. • They can be used to transport genes for genetic engineering and gene manipulation. Docsity.com Viruses and Cancer • Some types of viruses can cause tumor growth in laboratory cultures. • Epstein Barr and hepatitis B viruses have been linked to cancer growth. • It is believed some viruses contain cancer genes called oncagenes. • Oncagenes in contact with certain human oncagenes and cancer causing agents can cause some types of cancer. • Ex. Some types of leukemia, some types of cervical cancer and liver cancer Docsity.com Emerging Viruses • An existing virus can evolve and and cause disease in organisms that were one immune to it. • An existing virus can spread from one type of host to another. Humans can get viruses from other species. • An existing virus can spread from a small population to become more widespread. Hantavirus can spread from small mouse populations to the human population. Docsity.com What are some viruses that can be used? • HIV • Hantavirus • Ebola virus • Smallpox • Polio • Hepatitis • Dengue fever • Lassa fever • Rift valley fever • Influenza • Monkeypox • Epstein-Barr virus Docsity.com Where do I start? • Center for Disease Control • Outbreak • Hidden Killers • World Health Organization Docsity.com