"Virus" PPT courseware 5

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"Virus" PPT courseware 5

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"Virus" PPT courseware 5

1. Discovery of viruses

The famous Russian scientist, Ivanovsky, discovered the filterability of the cause of tobacco mosaic disease in 1892

Scientific confirmation: The causative agent of tobacco mosaic disease is smaller than bacteria!

scientists call them filtration viruses

In the early 20th century, scientists first observed tobacco mosaic virus as a rod-shaped particle using an electron microscope.

2. The shape of the virus

Now we know that human influenza, AIDS, animal foot-and-mouth disease, chicken plague, plant tobacco mosaic, SARS, mad cow disease, etc. are all diseases caused by viral infections. The morphology of viruses can be seen under an electron microscope to be diverse.

3. Types of viruses

It is mainly divided into three categories according to different hosts:

Animal viruses: viruses that specifically parasitize human and animal cells.

Plant viruses: viruses that specifically parasitize plant cells.

Bacterial viruses: viruses that specifically live in bacterial cells.

4. The relationship between viruses and humans

Harmful aspects:

(1) Viruses are widely distributed, and almost all organisms can be infected by viruses and cause disease. 80% of various human infectious diseases are caused by viruses.

(2) Viruses make animals and plants sick

Beneficial aspects:

(1) Use viruses to prevent and treat diseases (make vaccines)

Production: bird flu vaccine, hepatitis B vaccine, influenza vaccine, SARS vaccine, etc.

Vaccine: Avirulent or attenuated virus

(2) Use viruses as special insecticides (viral insecticides such as cotton bollworm, pine caterpillar, and cabbage caterpillar developed in my country)

(3) Makeup artist of flowers - using the discoloration of plant leaves and flowers caused by viral infection to create new flower varieties.

1. Trust your own judgment

1. In the early 20th century, which instrument did scientists use to observe tobacco mosaic virus for the first time... ( )

A. Magnifying glass B. electron microscope

C. Low-magnification optical microscope D. High power optical microscope

2. The shape of tobacco mosaic virus is…………………… ( )

A. Spherical B. Rod shape C. Spiral D. tadpole shape

3. Among the following organisms, the one that does not have a cellular structure is…………()

A. Escherichia coli B. Pseudomonas aeruginosa phage

C. Penicillium D. Agaricus bisporus

5. What does the structure of a virus consist of? ( )

A. Cell wall, cytoplasm, nucleus B. cell membrane, cytoplasm, nucleus

C. Fiber cord shell and core composed of genetic material D. protein shell and core made of genetic material

6. The main difference between viruses and other organisms is that viruses ( )

A. Unable to live independently b. Without chloroplasts, organic matter cannot be produced

C. No cytoplasm and nucleus D. Very tiny, no cellular structure

7. After phages invade cells, under what control do they reproduce new viruses ( )

A. Bacterial genetic material B. The genetic material of the bacteriophage itself

C. Bacterial proteins D. Phage's own proteins

Keywords: virus teaching courseware, download of PPT courseware for eighth-grade biology volume 1 of People’s Education Edition, download of eighth-grade biology slide courseware, download of virus PPT courseware, .PPT format;

For more information about the "Virus" PPT courseware, please click on the Virus ppt tab.

"Virus" PPT courseware download:

Download the first part of the "Virus" PPT courseware: The common viral disease mumps (epidemic parotitis, mumps) is an acute respiratory infectious disease caused by the mumps virus invading the parotid gland. It is a common respiratory infectious disease among children and adolescents, and adults. .

"Virus" PPT download:

"Virus" PPT Download Part One: Microorganisms More than 99% of the organisms on the earth are invisible to the naked eye. These organisms form a crowded and chaotic world of microorganisms. Small life forms are called microorganisms. Viruses Bacteria Fungi Protozoa Viruses are...

"Virus" PPT:

"Virus" PPT A virus is a biological entity whose genome is a nucleic acid molecule (DNA or RNA) that can use the cell's synthetic system to replicate in living cells and synthesize special particles that can transfer the viral genome to other cells. The discovery of viruses in Egypt in the 18th century...

File Info

Update Time: 2024-08-06

This template belongs to biology courseware People's Education Edition Biology for Grade 8, Volume 1 industry PPT template

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