PPT-Survey of DNA Viruses Herpesviruses

Persistent Human Viruses 1 Large family of viruses 150200 nm in diameter 2The nucleocapsid is 100 nm in diameter with cubic symmetry and 162 capsomeres surrounded by a lipidcontaining envelope . A. Viruses are a unique group of biological entities. 1. They are not capable of surviving without a host cell (lack metabolic machinery). 2. They do, however, contain all the information necessary to direct metabolic processes. What is a Virus?. Very small . Non-living particle. Made up of nucleic acid. . and proteins. Can only reproduce by infecting living cells. Do not carry out respiration, grow or develop. Structure. Viruses have an inner core which contains either RNA or DNA. copyright cmassengale. 2. Are Viruses Living or Non-living?. Viruses are both and neither. They have . some properties of life but not others. For example, viruses can be killed, even crystallized like table salt. HIV infected T-cell. Viral Structure. not . cells. small . infectious particles . w/. DNA or RNA enclosed . in a protein coat . (capsid). in . some cases. , a membranous envelope. Viral Genomes. genomes . Chapter 18. Are Viruses Alive?. As a group discuss for 1 minute. Be able to defend your answer for the class!. Are . VIRUSES. alive?. Growth and Development. Reproduce. Change Over Time. Obtain and Use Energy. What do viruses need to reproduce?. Other viruses. Host organisms. A nutrient medium. An enzyme solution. Which characteristic do viruses possess in common with living cells?. They contain a nucleus and organelles.. . 19, . Ch. 23, and more . Bacteria & Virus Overview. Interesting stuff!. We live with bacteria and viruses constantly, but most people don’t know much about them.. In this chapter we learn both the good and bad of each. -It’s not a plant or an animal.. -It’s not a fungi, protist, or bacteria.. WHAT IS A VIRUS?. A virus is an . infectious. agent made up of . nucleic. acid (. DNA. or . RNA. ) wrapped in a . protein. -It’s not a plant or an animal.. -It’s not a fungi, protist, or bacteria.. WHAT IS A VIRUS?. A virus is an . infectious. agent made up of . nucleic. acid (. DNA. or . RNA. ) wrapped in a . protein. VOCABULARY. Virus. Capsid. Envelope. Human . Immunodeficiency Virus (HIV. ). Influenza. Lytic Cycle. Lysogenic Cycle. Lysis. Retrovirus. Prerequisite questions. What are the eight characteristics which all living things have in common. DNA . is a molecule in your cells’ nuclei that can be . used as instructions by your cells . to make new cells, and pigments for your hair and skin.. What is DNA again?. The DNA instructions are really a pattern of 4 different chemicals read as a code by the cell’s nucleus.. -It’s not a plant or an animal.. -It’s not a fungi, protist, or bacteria.. WHAT IS A VIRUS?. A virus is an . infectious. agent made up of . nucleic. acid (. DNA. or . RNA. ) wrapped in a . protein. Lec. : 4. Non-enveloped DNA Viruses. Non-enveloped . viruses are surrounded by a protein coating, commonly referred to as a capsid. The capsid does the job of attaching to host cells. .. Non-enveloped . 1- Former member of the . Papovaviridae. family. Similar to . polyomaviruses. in some respects, but with a larger genome (8 . kbp. ) and particle size (55 nm). . 2-There are many genotypes of human papillomaviruses, also known as .