Virus Notes TEK 4C. Section 18.1 Summary – pages 475-483 Viruses are composed of nucleic acids enclosed in a protein coat and are smaller than the smallest.

Slides:

Advertisements

Similar presentations

Eukaryotes, Prokaryotes, and Virus Section 7.1 Pg Section 18.1 pg

Advertisements

Unit 5: Classification and Kingdoms

In what kingdom do we classify a virus? None! Viruses are not considered living, so we do not classify them with living organisms.

Section 18.1: Viruses Vocabulary: virus, host cell, bacteriophage, capsid, lytic cycle, lysogenic cycle, provirus, retrovirus, prions, viroids.

Unit Overview – pages Viruses, Bacteria, Protists, and Fungi Viruses and Bacteria Viruses.

 juriesandconditions/viruses/ juriesandconditions/viruses/

CHAPTER 19 BACTERIA AND VIRUSES.

Ch 18 Viruses and Bacteria 04 Biology 2008 From Mrs. C. Phillips, DHS black.

Structure of Viruses All viruses are composed of: – Nucleic acids: Virus’s genetic material DNA or RNA Code solely for reproduction – Capsid: Protein coat.

18.1 Section Objectives – page 475

Characteristics of Life

Lesson 3 Reading Guide Lesson 7-3 What are Viruses?

Latin for “toxic” or “poison” A virus is a non-living microscopic particle, much smaller than a bacteria, which cannot grow or reproduce apart from.

1 Viruses  Virus in latin means, “poison”  Definition- Infectious non-living particle that duplicates in the cells of an infected host. 2.

KEY CONCEPT Infections can be caused in several ways.

Viruses  Is it living?  Shapes/Structure  Replication  Types of viruses.

Viruses I can reproduce inside a living cell, yet I am dormant (inactive) outside a cell Q: Am I living or nonliving? Q: Am I a eukaryotic or prokaryotic.

Lesson 3 Viruses. Virus Tiny “organism” that is parasitic to cells Composed of two main parts: Protein outer shell called capsid Genetic material inside.

Viruses Living or Not Virus Virus – small particle made of 1.Nucleic acids either DNA or RNA 2.Surrounded by a protein coat.

Lesson 7-3 What are Viruses?

Viruses. Nonliving particles Very small (1/2 to 1/100 of a bacterial cell) Do not perform respiration, grow, or develop Are able to replicate (only with.

Viruses Coach Blocker Schley County Middle School Ellaville, Georgia.

Viruses Chapter 19. Viruses Non-living, cannot reproduce without a hostNon-living, cannot reproduce without a host Contain either DNA or RNA (retrovirus)

Chapter Viruses Part 1 – Virus Structure and Function.

Viruses Living or Not Virus Virus – small particle made of 1.Nucleic acids either DNA or RNA 2.Surrounded by a protein coat.

PATHOGENS. HOW DO PATHOGENS CAUSE DISEASE? EVIL SPIRITSSWAMP AIR IMBALANCE OF BODY FLUIDS.

VIRUSES A tiny, non-living parasite (particle) that enters and reproduces inside a living host cell. Two types: 1. Active 2. Hidden.

State Standard SB3D. Compare & contrast viruses with living organisms. Viruses (18.2)

Viruses Intro to Viruses Movie I.General info: A. Viruses are pathogens (cause disease) that affect organisms in all 6 kingdoms B. Don’t belong to any.

Viruses. Nonliving particles Very small (1/2 to 1/100 of a bacterial cell) Do not perform respiration, grow, or develop Are able to replicate (only with.

VIRUSES PA State Standards:. What are VIRUSES? 1) A nucleic acid (DNA or RNA) surrounded by a coat of protein. 2) Viruses are not considered to be alive.

Viral Cycles: Lytic Lysogenic

It’s a Small Small World Part A-Viruses, Bacteria and Protists.

Compare the structures and functions of viruses to cells

Chapter What is a virus? A virus is nucleic acid wrapped in a protein coat Can be DNA or RNA Viruses are considering nonliving because they can’t.

Structure, Function, and Reproduction

This is the image of a bacterium being attacked by viral particles. You can see the contrast in size easily. In ancient Rome, ‘virus’ meant “poison” or.

Chapter 18.1: Viruses. 1. Viruses are composed of nucleic acids enclosed in a protein coat and are smaller than the smallest bacterium.

Viruses. Virus: Segments of nucleic acid (DNA OR RNA) within a protein coat (noncellular); NONLIVING; much smaller then prokaryotes Must reproduce within.

Viruses Ch General Characteristics 1/100 the size of bacteria 1/100 the size of bacteria –Only seen with electron microscope Non-living Non-living.

Viruses AIDS Virus Polio Virus Bacteriophage Tobacco Mosaic Virus Influenza Virus Ebola Virus.

Viruses 1.Identify the structures of viruses 2.Explain the differences between the lytic and lysogenic cycles of viral reproduction 3.Recognize the medical.

1 Viruses  Virus in latin means, “poison”  Definition- Infectious non-living particle that duplicates in the cells of an infected host. 2.

Viruses. Tiny 1/2 to 1/100 the size of smallest bacterium Nonliving Do not fulfill the criteria for life Do not carry out respiration, grow or move Can.

Viruses. Video Viruses Unit 5 - Viruses and Bacteria (Ch. 18) 1.Identify the major components of a Bacterium and Viruses 2.List the two major stages.

Headings Vocab Important Info

Viruses Virus: A biological particle composed of nucleic acid and protein pathogen: anything that causes sickness or disease.

Viruses What is the structure and function of viruses?

Take 5 A cell that is virally infected appears to be bursting and dying under the microscope. Which infectious cycle is the virus undergoing? Sometimes.

Virus Notes Chapter 19 Section 19-2.

Viruses What is the structure and function of viruses?

Say Hello to My Little Friend

Virus Notes Chapter 19 Section 19-2.

Virus Characteristics

Viruses Alive? Or Not?.

Presentation transcript:

Virus Notes TEK 4C

Section 18.1 Summary – pages Viruses are composed of nucleic acids enclosed in a protein coat and are smaller than the smallest bacterium. What is a Virus?

Section 18.1 Summary – pages Viruses are considered nonliving because: They are NOT cells. They don’t carry out respiration, grow, or develop. They do not reproduce like living cells. What is a Virus?

Viruses cannot reproduce without the help of a living cell. Viruses infect a host cell and inject their DNA/RNA.

A cell in which a virus replicates inside of is called the host cell. What is a Host Cell?

Section 18.1 Summary – pages Before a virus can replicate, it must enter a host cell. A virus recognizes and attaches to a host cell when one of its proteins attaches with a molecular shape that is the receptor site on the host cell’s plasma membrane. Virus

Section 18.1 Summary – pages Each virus has a specifically shaped attachment protein. Therefore, each virus can usually attach to only a few kinds of cells. In general, viruses are species specific, and some also are cell-type specific. For example, polio viruses normally infect only intestinal and nerve cells. Viral Attachment to Host

Section 18.1 Summary – pages A virus has an inner core of nucleic acid, either RNA or DNA and an outer protein coat called a capsid. Capsid Nucleic acid Viral Structure

Section 18.1 Summary – pages Some larger viruses, such as human flu viruses, may have an additional layer, called an envelope, surrounding their capsids. Capsid Nucleic acid Envelope Viral Structure Envelopes are composed primarily of the same materials found in the plasma membranes of all cells.

Polyhedral virus shape Human Papilloma Virus Envelope studded with projections (flu and AIDS) VIRUS SHAPES

Long narrow helical shape (Tobacco Mosaic Virus) Polyhedral-shaped head attached to a cylindrical tail with leg-like fibers VIRUS SHAPES

Viruses and Disease

A vaccine is an injection of particles of viruses or bacteria that provide the human body with a defense against disease.

Antibiotics are ineffective against viral infections. For bacterial infections, antibiotics are a good option.

Common Viral Diseases Influenza Common Cold Chicken Pox

Common Viral Diseases Small Pox HIV / AIDS HIV attacking T-Cell West Nile Virus Transmitted by mosquito