Chapter 18 Viruses and Bacteria - PowerPoint Presentation

Download presentation
Chapter 18 Viruses and Bacteria
Chapter 18 Viruses and Bacteria

Chapter 18 Viruses and Bacteria - Description


Pages 476 495 A Rhinovirus The Flu What is a Virus Nonliving particles that cant reproduce nucleic acids DNA or RNA enclosed in a protein coat Smaller than the smallest bacterium ID: 692410 Download Presentation

Tags

bacteria viruses virus cycle viruses bacteria cycle virus cells herpes cell food hiv rna lysogenic replicate bacterium soil nitrogen host lytic blood

Embed / Share - Chapter 18 Viruses and Bacteria


Presentation on theme: "Chapter 18 Viruses and Bacteria"— Presentation transcript


Slide1

Chapter 18 Viruses and Bacteria

Pages 476 - 495Slide2

A Rhinovirus Slide3

The FluSlide4
Slide5

What is a Virus??

Non-living particles that can’t reproduce

nucleic

acids

(DNA or RNA)

enclosed

in a protein coat

Smaller than the smallest bacterium

Do

replicate on their

own

Must have a hostSlide6

Viruses

Don’t

carry out

respiration, develop or grow

~~Influenza, smallpox, HIV, Herpes I and Herpes II

Can mutate to become more dangerous

Bacteriophages infect bacterial cells

All living organisms can contract viruses

Some are species specific – HIV only affects humans

Have to have a host to replicate

Found soil, air waterSlide7

Structure of Bacteriophage that Infects BacteriaSlide8

Bacteriophage Slide9

Bacteria Phages Amplified with Electron MicroscopeSlide10

Virus Amplified by Electron MicroscopeSlide11

Viruses Replicate (NOT real reproduce)Slide12

Viral Replication Cycles

Lytic Cycle

Lysogenic CycleSlide13

Lytic Cycle

A virus takes over a

h

ost’s genetic material

The cell bursts (

Lysis

) and viruses spread

Uses its structures and energy to replicate many viruses Slide14

Lytic CycleSlide15

Lysogenic Cycle

** The virus’s nucleic acid (DNA/RNA) is integrated into the host cell’s chromosome

**

Th

e virus lay “dormant” as the cell reproduces itself

**

The

cell is then called a provirusSlide16

Lysogenic Cycle

After the virus has inserted its genetic material (Step 1)Slide17
Slide18

Replication Activity

Compared to a FactorySlide19

Types of VirusesSlide20

Tobacco Mosaic virus causes leaves to turn yellow and can’t be sold at marketSlide21

Proviruses

(Undergo the lysogenic cycle)

Herpes Zoster (chicken pox), Herpes

simplex

I (cold Sores),

herpes simplex II

(Genital Herpes),

and

hepatitis B (affects liver)Slide22

Retrovirus

RNA viruses—RNA being their only

HIV

that causes the disease

AIDSSlide23

Retrovirus HIV

Infects

white blood

cells (remember B and T Cells!!!)

Released

into the blood stream by

exocytosis

and infect other white blood cells.Slide24

HIVSlide25

Cancer and Viruses

Viruses linked to cancer

disrupt

mitosis

HPV is the most common

Human

Papilloma Virus causes genital warts and accounts for about 76% of cervical cancersSlide26

BacteriaSlide27

Bacteria - Prokaryotes

Archaebacteria

– The extremist; Oldest;

salt-loving; heat-loving

Eubacteria

Some are photosynthetic - photosynthesis

Some undergo chemosynthesis – break down surrounding organic compounds for food

Some are heterotrophs – “eat” their own foodSlide28

Bacteria Reproduction

Binary Fission Conjugation

Type of Reproduction Asexual Sexual

--------------------------------------------------------------------------------------------

How it Happens One bacterium one bacterium

makes a copy of transfers

its chromosomes chromosomes to

and splits into two another bacterium through

pili

-----------------------------------------------------------------------------------------------

Description of Cells Genetically Genetically different

Produced identicalSlide29

Bacteria

Flagellum

Ribosome

Cytoplasm

Chromosome

capsule

Cell Wall

Cell

Membrane

PiliSlide30

Bacteria Adaptations

Endospore

forms around bacteria during harsh conditions

Cells grow and reproduce

Can produce toxins

Botulism (food poisoning), anthrax (lives in soil)

Can mutate quickly to environmental change and become more dangerousSlide31

Harmful

Some make you sick and can

bcome

antibiotic resistant

Strep throat

Food poisoning

Some Pneumonias

Lyme disease

Tuberculosis

CavitiesSlide32

Helpful to Humans

Nitrogen fixation (plant root convert nitrogen gas into usable nitrogen for the plant)

Return nutrients to soil

Produce oxygen

Production of cheese, yogurt and pickles

E. coli

in the intestines

Used in farming, medicine and food industry

Shom More....
By: danika-pritchard
Views: 5
Type: Public

Download Section

Please download the presentation after appearing the download area.


Download Presentation - The PPT/PDF document "Chapter 18 Viruses and Bacteria" is the property of its rightful owner. Permission is granted to download and print the materials on this web site for personal, non-commercial use only, and to display it on your personal computer provided you do not modify the materials and that you retain all copyright notices contained in the materials. By downloading content from our website, you accept the terms of this agreement.

Try DocSlides online tool for compressing your PDF Files Try Now

Related Documents