Free Powerpoint Presentations

Viruses and HIV
Page
1

DOWNLOAD

PREVIEW

WATCH ALL SLIDES

Slide 1

Viruses

Viruses

Slide 2

Is a Virus a Living Organism?

Is a Virus a Living Organism?

Chapter 1 Properties of life

Cellular Respiration

Reproduction

Metabolism

Homeostasis

Heredity

Responsiveness

Growth and development

Slide 3

Viruses are not living organisms

Viruses are not living organisms

Viruses do not

Grow

Have homeostasis

Metabolize

Viruses do

Infect cells and use the cell to make more viruses

Cause disease in many organisms

Slide 4

Parts of a Virion (a virus particle)

Parts of a Virion (a virus particle)

Nucleic Acid RNA or DNA

Capsid protein coat that surrounds the DNA or RNA in a virus

Lipid Membrane a membrane around the capsid in many kinds of viruses; helps the virus enter cells (enveloped viruses; without the membrane, the virus is naked)

Made of proteins, lipids, and glycoproteins

Slide 5

RNA or DNA?

RNA or DNA?

Viruses with RNA

Human immunodeficiency virus (HIV)

Influenza viruses

Rabies

Viruses with DNA

Warts

Chickenpox

mononucleosis

Slide 6

Virus Shapes

Virus Shapes

Helical

Rodlike with capsid proteins winding around the core in a spiral

Tobacco Mosaic Virus

Slide 7

Virus Shapes

Virus Shapes

Polyhedral

Has many sides

Most polyhedral capsids have 20 sides and 12 corners

Slide 8

Virus Shapes

Virus Shapes

Polyhedral capsid attached to a helical tail.

Slide 9

How do viruses replicate?

How do viruses replicate?

2 methods of replication:

1. Lytic Cycle the virus enters the cell, replicates itself hundreds of times, and then bursts out of the cell, destroying it.

2. Lysogenic Cycle the virus DNA integrates with the host DNA and the hosts cell helps create more virus DNA. An environmental change may cause the virus to enter the Lytic Cycle.

Slide 10

In the lytic cycle, the virus reproduces itself using the host cell's chemical machinery. The red spiral lines in the drawing indicate the virus's genetic material. The orange portion is the outer shell that protects it.

In the lytic cycle, the virus reproduces itself using the host cell's chemical machinery. The red spiral lines in the drawing indicate the virus's genetic material. The orange portion is the outer shell that protects it.

Slide 11

Go to page:
 1  2  3 

Contents

Last added presentations

2010-2018 powerpoint presentations