WHAT IS A VIRUS? A NONLIVING, NONCELLULAR PARTICLE MADE UP OF GENETIC MATERIAL AND PROTEIN.

Slides:

Advertisements

Similar presentations

Warm Up Monday, March 18, 2013 Which process copies a strand of DNA (DNA to DNA)?

Advertisements

If it is not alive, We can’t kill it -- We can only wish to contain it!

Unit 5: Classification and Kingdoms

Virus: A biological particle composed of nucleic acid and protein Intracellular Parasites: organism that must “live” inside a host What is a Virus?

HAPPY THURSDAY Bellwork: What is a virus? How do viruses make us sick? How are viral infections treated? Can viral infections be prevented? Write 37 words.

Chapter 18. As a group discuss for 1 minute. Be able to defend your answer for the class!

Viruses What are they? How do they work? Where do they come from? And… What good are they? Viruses.

Viruses and Prokaryotes What Viruses Mean To You If you have ever had a cold, you are probably familiar with the word virus. It is a word that makes most.

Viruses What are they? How do they work? Where do they come from? And… What good are they? Viruses.

Viruses Non-living - does not grow, eat, release waste, or breathe. Is able to reproduce, but only when inside a host (the cell that a virus enters) 100.

Viruses Virus – Latin for “toxin or poison” Particles of nucleic acid, protein, and sometimes lipids Enter living cells and use the cell to produce more.

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 Why are viruses considered non-living? Do they have organelles? Do they carry out life processes? –Grow, take in food, make waste? –How.

Viruses. Virus: Particles of nucleic acid, protein, some lipids Reproduce vicariously Use the cells they infect to build new viruses.

1 2 Characteristics of Viruses 3 Types of Viruses.

18.1 Studying Viruses and Prokaryotes Characteristics of Living Organisms Made up of cells Reproduce on their own Have genetic information, DNA Grow and.

Viruses. Virus A non living particle composed of a nucleic acid and a protein coat A non living particle composed of a nucleic acid and a protein coat.

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. Virus – non-cellular particle made up of genetic material and protein. Reproduce only by infecting living cells. –Viruses share some, but not.

Microbiology Ch 17.1: Viruses 17.2: Monera. Virus: A noncellular particle made up of genetic material and protein that can invade cells.

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.

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 Ebola Influenza Rabies HIV West Nile Virus.

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

Structure, Function, and Reproduction

Microbiology Ch 18.2: Viruses 18.1: Monera Virus: A noncellular particle made up of genetic material and protein that can invade cells.

Chapter 19.  Non-living ◦ Non-cellular ◦ Cannot grow or reproduce on its own ◦ No metabolism  Cause disease ◦ AIDS, colds, flu, measles, mono  Cause.

Use the picture and this information to help you make your decision: 1.Viruses contain RNA or DNA 2.Viruses cannot replicate on their own, they must use.

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

Viruses Nonliving Pathogens. Viruses Pathogen (infectious agent) – any living organisms or particle that can cause infectious disease Can be living or.

Major Parts of a Virus - Bacteriophage

Chapter 18 - Viruses. Structure A virus is a non-living particle A virus is a non-living particle Composed of DNA or RNA and a protein coat Composed of.

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.

What is a virus?.

WHAT IS A VIRUS? A NONLIVING, NONCELLULAR PARTICLE MADE UP OF GENETIC MATERIAL AND PROTEIN.

Chapter 18 Studying Viruses and Prokaryotes

Viruses Essential Questions: What is the structure of a virus and how do viruses cause infection?

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

What living things do you see in this photo?

Random fact Certain types of cancers have been linked to cancer viruses. Burkitt's lymphoma, cervical cancer, liver cancer, T-cell leukemia and Kaposi.

Virus Notes Chapter 19 Section 19-2.

Virus Notes Chapter 19 Section 19-2.

Are Viruses Alive?.

Viruses Viruses – are segments of nucleic acids

Viruses Chapter 19.

Viruses Chapter 18.

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

Viruses TEK 4C: Compare structures of viruses to cells, describe viral reproduction, and describe the role of viruses in causing diseases such as HIV and.

Presentation transcript:

WHAT IS A VIRUS? A NONLIVING, NONCELLULAR PARTICLE MADE UP OF GENETIC MATERIAL AND PROTEIN

STRUCTURE OF A VIRUS CORE OF NUCLEIC ACID CAN BE DNA/RNA SURROUNDED BY A PROTEIN COAT HEAD (CAPSID)

BACTERIOPHAGE

Viral Structures

SIZES OF VIRUSES FROM NANOMETERS (1 billionth of a meter) A nanometer is one billionth of a meter E. Coli Bacteria nm

SPECIFICITY VIRUSES INFECT SPECIFIC ORGANISMS PLANT VIRUSES DO NOT INFECT ANIMALS SOME ONLY INFECT HUMANS RABIES INFECT ALL MAMMALS AND SOME BIRDS SOME INFECT CLOSELY RELATED SPECIES

<<<< VIRAL REPRODUCTIO N CYCLE <> LIFE CYCLE OF LYTIC VIRUSESLYTIC LYTIC-CAUSES HOST CELL TO LYSE 1. INFECTION-VIRUS ACTIVATED BY CONTACT W/HOST CELL, INJECTS VIRAL GENETIC MATERIAL

LIFE CYCLE CONTINUED 2. GROWTH-HOST CELL CAN’T DISTINGUISH HOST VS. VIRAL DNA-VIRAL GENES SHUT OFF HOST GENES 3. REPLICATION-USES HOST CELL MATERIAL TO MAKE COPIES OF PROTEIN COAT & DNA 4. LYSIS –LAST STAGE CELL RELEASES REPLICATED VIRUS

LysogenicLysogenic Virus Cycle

RETROVIRUSES CONTAIN RNA RETRO-means backwards. RNA TO DNA After infection VIRUS produces DNA COPY from its RNA using the enzyme Revere Transcriptase Viral DNA is INSERTED into HOST cells & new Virus copies are made

TRANSMISSION INSECT BITE BITE OF INFECTED ANIMAL CONTAMINATED FOOD, WATER, BLOOD, SEXUAL CONTACT NEEDLES OR AIR

SYMPTOMS EVIDENCE OF DISEASE SUCH AS: RASH FEVER PARALYSIS HEADACHE ACHES SWOLLEN GLANDS CONGESTION

TREATING VIRUSES VACCINES CAN CONSIST OF LIVE OR (attenuated) altered BACTERIA OR VIRUSES contain ANTIGENS (surface proteins) from the virus. They stimulate the immune system of an organism to make antibodies Vaccines can be given orally, inhaled or injected

TREATING VIRUSES Why do vaccines not always work? A Virus can mutate its surface proteins. The organism’s immune system may not detect the changed protein and not attack it. –Example flu virus Each year a new flu vaccine has to be made because of mutated proteins

Anim3.htm VACCINE ANIMATION Creation of antibodies