"Virus" PPT courseware 7

Description

"Virus" PPT courseware 7

learning target

1. Describe the main characteristics of the virus.

2. Use information to understand the relationship between viruses and humans.

3. Pay attention to virus-related diseases and agree that the use of viruses can benefit mankind.

Study alone P89-92:

1. Who discovered the virus? What was the process of discovering the virus?

2. What is the shape and size of the virus?

3. How do viruses live? What three categories can viruses be divided into based on their hosts?

4. What are the structural characteristics of viruses?

5. How do viruses reproduce?

6. What is the relationship between viruses and humans?

1. Who discovered the virus?

At the end of the 19th century, when Russian scientists were studying the cause of tobacco mosaic disease, they speculated that it was caused by bacteria. But research results show that tobacco mosaic disease is caused by pathogens smaller than bacteria, which he called "filtration viruses."

Ivanovsky’s experimental process of discovering viruses:

Tobacco mosaic disease is caused by pathogens smaller than bacteria.

2. What is the shape and size of the virus?

3. How do viruses live? What three categories can viruses be divided into based on their hosts?

Viruses cannot ______ live and must ______ inside the cells of other organisms.

Viruses can only live in ______.

If a virus leaves ______, it usually becomes ______. As soon as it has the opportunity to invade living cells, life activities will start again.

4. What are the structural characteristics of viruses?

The structure of the virus is very simple. There is no ______ structure, only ______ shell and internal ______.

5. How do viruses reproduce?

Viruses can only parasitize in ______, rely on ______ in their own genetic material, and use ______ to create new viruses. This is its way of reproduction.

In-class testing:

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

A. Magnifying glass B. Electron microscope

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

2. What does the structure of the virus consist of ( )

A. Cell wall, cytoplasm, nucleus

B. Cell membrane, cytoplasm, nucleus

C. Made of cellulose shell and genetic material

D. Made of protein shell and genetic material

3. Which of the following statements about viruses is incorrect ( )

A. Viruses are much smaller than bacteria

B. Viruses come in various shapes, including sphere, rod, tadpole, etc.

C. Viruses have no cellular structure

D. Viruses are harmful to humans

4. The viruses that cause AIDS, foot-and-mouth disease, and tobacco mosaic disease belong to ( ) respectively

A. Human viruses, bacterial viruses, plant viruses

B. Animal viruses, animal viruses, plant viruses

C. Human viruses, animal viruses, plant viruses

D. Animal viruses, bacterial viruses, plant viruses

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Update Time: 2024-10-29

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

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