Viruses.

Slides:

Advertisements

Similar presentations

Viruses Dead or alive?.

Advertisements

Protein Shell DNA or RNA Membrane around virus Proteins that help virus get into proper host.

Genetics of Viruses.

How can this affect you?. Lysogenic and Lytic Cycles …When Viruses Attack.

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

VIRUS MEANS “POISON”!. MADE OF PROTEIN AND NUCLEIC ACID (EITHER DNA or RNA)

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

 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. 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 Organisms that bridge between living and non-living things.

Viruses Living or Not ???????. Characteristics of Viruses Among the smallest biological particles that are capable of causing diseases in living organisms.

 They are microscopic, nonliving particles  Some are harmless, while others kill their hosts, ALL are infectious!  They do not display most of the.

1 Viruses – Cellular Pirates Adenovirus showing Varicella zoster virus icosahedral shape causes chickenpox.

Genetics of Viruses.

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

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

Viruses: Key Ideas Why is a virus not considered a living organism?

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.

Viruses- Are they alive? Acellular Can not metabolize Can’t grow or respond to environment Can’t reproduce without host Discovery- Wendell Stanley- tobacco.

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

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. 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.

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

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.

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.

{ Viral Replication  Virus: A biological particle composed of nucleic acid and protein  Intracellular Parasites: organism that must “live” inside a.

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.

Flashback to VIRUSES! What do viruses need to reproduce? Other viruses

What is a virus? Tiny organisms that may lead to mild to severe illnesses in humans, animals, and plants.

Section 2: Viruses.

SBI 3U Ms.Zafar October 1st, 2012

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

Set up Cornell notes in your IAN Notebooks to take notes on

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

KEY CONCEPT Viruses exist in a variety of shapes and sizes.

VIRUSES Viruses – are segments of nucleic acids contained in a protein coat; they are not cells; they are smaller than prokaryotes and range in size.

Viral Structure, Lifecycles, HIV

Virus Notes Chapter 19 Section 19-2.

Viruses Review.

KEY CONCEPT Viruses exist in a variety of shapes and sizes.

Virus Notes Chapter 19 Section 19-2.

Viruses Dead or alive?.

Viruses Viruses – are segments of nucleic acids

Chapter 15 Viruses, Viral Life Cycles, Retroviruses.

Viruses Biology 2 Mr. Beyer.

Viruses Chapter 19.

To be considered living…

KEY CONCEPT Viruses exist in a variety of shapes and sizes.

Biology 11 Viruses.

Viruses Dead or alive?.

Pick up a book (pg 338) and present trp operon with your team

VIRUSES Viruses – are segments of nucleic acids contained in a protein coat; they are not cells; they are smaller than prokaryotes and range in size.

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 Viruses – are segments of nucleic acids

Presentation transcript:

Viruses

Characteristics Size - ~20nm – 250nm Some char. of life, not all: - no nucleus, cytoplasm, organelles, or membrane - no cellular functions - need a host cell to reproduce

Structure Made of : 1. Nucleic Acid (DNA or RNA) 2. Protein coat around it (capsid) Some also have: - lipid envelope outside capsid *helps it infect cell - glycoprotein – used to attach to host cell

Replication Lytic cycle – virulent (kills cell) 1. Attachment 2. Injection of NA 3. Replication 4. Assembly 5. Release of new viruses (burst cell)

Lysogenic cycle – temperate (lives with host) 1. Attachment 2. Injection 3. Integration of DNA 4. Cell Multiplication Can revert to lytic