Chapter 18.2 Viruses Page 525. “Virus” Comes from the latin word “poison”

Slides:

Advertisements

Similar presentations

Unit 5: Classification and Kingdoms

Advertisements

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

Life Cycles of Viruses.

 juriesandconditions/viruses/ juriesandconditions/viruses/

Viruses & Bacteria Chapter 19. I. Viruses Q: Is a virus living or nonliving? Viruses HAVE: DNA or RNA Reproduce (only in living cells)

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

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

Viruses. Non-cellular particles of nucleic acid, protein, and in some cases lipids that can reproduce only by infecting living cells Differ widely in.

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

 Viruses- particles of nucleic acid, protein and sometimes lipids  Most viruses are so small, they can only be seen through a powerful electron microscope.

Viruses! The girl who survived Rabies.

VIRUSES Latin for “poison” VIRUS: a particle that can only be seen with an electron microscope It is different from a cell because it does not: contain.

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

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

The Virus. What is a Virus? Virus Latin for Poison Non-cellular particle with DNA or RNA 1 or 2 Protein Coats (Capsids) May have Viral Envelope - Phospholipids.

Virus. biological particle/ pathogen virus comes from Latin “poison” living? or non-living? rabies virus Virus.

Viruses Something you don’t want to catch…. Viruses 1. How do scientists classify things as living? 1.Made of cells 2.Has a metabolism to grow and reproduce.

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

IN: ► Discuss the following two questions with your group. What is a virus? (Come up with a definition.) Are viruses alive? (Be prepared to defend your.

Viruses. What Is a Virus? Viruses are particles of nucleic acid (DNA/RNA), and a protein coat. All viruses enter living cells and use the infected cell.

1 Latin for “poison” A virus is a particle that can only be seen with an electron microscope.

Viral Reproduction. Viruses If viruses are non-living, how do they replicate?? They need a host cell! Before a virus can replicate, it must attach to.

Virus - Latin name for poison Characteristics Does not fit in the 6 kingdom classification system A chemical that carries out no life function of its.

Viruses. At the boundary of life, between the macromolecules (which are not alive) and the prokaryotic cells (which are), lie the viruses and bacteriophages.

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.

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.

Viruses. What is a virus? A virus is: NON-LIVING particle Made of a protein coat and DNA or RNA Smaller than bacteria ( nm)

Viruses For EOC Review. IV.Preventing Bacterial Disease 1. Vaccine- A preparation of a weakened or killed pathogen, such as a bacterium or virus. Body.

Viruses. Learning Objectives  Explain how viruses reproduce.  Explain what happens after a virus infects a cell.

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

1 Latin for “poison” A virus is a particle that can only be seen with an electron microscope.

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

1 NOTES: VIRUSES. 2  Vocabulary –Virus –Capsid –Lytic cycle –Lysogenic cycle –Retrovirus  Key Concepts –What is a virus? –How do viruses reproduce?

Major Parts of a Virus - Bacteriophage

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 & Disease Chapter 19.2 Herpes virusEbola virus.

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.

Two Cycles and A Bit of Review Remember that viruses are not able to reproduce on their own. They rely on a ‘host cell’ for reproduction In the Lytic Cycle.

VIRUSES. Viruses are particles containing: 1. Nucleic acid 2. Protein coat They can reproduce only by infecting living cells.

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

Headings Vocab Important Info

Viruses Doesn’t belong to any kingdom -It’s not a plant or an animal.

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

Viruses EQ: What is the general structure and function of a virus?

Tuesday 4/26/16 Learning Target: Know the characteristics, reproduction and how to control viruses. Learning Outcome: Create a virus of your choice which.

TEKS 4.C Students will… Compare the structure of viruses to cells, describe viral reproduction, and describe.

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

Virus Notes Chapter 19 Section 19-2.

Virus Notes Chapter 19 Section 19-2.

Are Viruses Alive?.

Chapter 15 Viruses, Viral Life Cycles, Retroviruses.

VIRUS “virus” is Latin for poison

Wednesday Jan 29, 2014 Take out your note packet from last week and open to the “VIRUS” section.

Viruses Doesn’t belong to any kingdom -It’s not a plant or an animal.

Did you wash your hands today?

Virus A pathogen that consists of a Nucleic Acid – (DNA or RNA) wrapped in a Protein Coat- (Capsid). Classification: Classified by the host Bacteriophage.

Presentation transcript:

Chapter 18.2 Viruses Page 525

“Virus” Comes from the latin word “poison”

What is a virus? “particles of nucleic acid and protein that can only reproduce by infecting living things” blah, blah, blah Variety of sizes, shapes All enter living cells and use the machinery of the infected cell to produce more viruses. Will die after infected the cell

Kingdom? NO KINGDOM Because…. no characteristics of life! Therefore we can’t place it in a kingdom.

Structure DNA or RNA Protein Coat (Capsid)

Host Cell Every virus will use a specific cell to insert its DNA into. Ex – HIV? White blood cell White blood cell

Host cell Recognition Every virus has 3-D proteins called RECEPTOR SITES on it. They are the opposite of the proteins on its host cell.(puzzle) The two will lock together allowing the virus to inject its DNA/RNA.

Viruses are Specific Species Most viruses only like a certain species. Ex – cat and hiv Cell type Most only like certain types of cells. Ex- hiv only likes white blood cells.

Prophage When the virus’s DNA is integrated into the host cell’s DNA AKA –”provirus”

Reproductive Cycles: 1.Lysogenic 2.Lytic

Lysogenic Cycle When a virus injects it’s DNA into the host cell’s DNA. It will become part of the host’s DNA and replicate itself every time the host cell does too. Can hide for years. Can be retriggered anytime Ex – Cold sores (herpes virus)

Lytic Cycle On a search and destroy mission. Happens in cytoplasm! Produce new viruses immediately Kills the host cell.

Lytic vs. Lysogenic Cycles

Protection from Viruses? Vaccine! = prevention! “a weakened version of the real virus” Memory cells and immune system will act as if it is an active virus Next time the virus really enters, the body is ready! Your Immune System! White blood cells will eventually kill the viruses. Drink lots of fluids and get plenty of rest!

DNA vs. RNA DNA Viruses are relatively stable. Vaccines are made and these viruses are “stopped.” RNA is unstable and mutates easily. “Retroviruses” Therefore it’s changing constantly Vaccines can’t keep up with the changes.