Chapter III: VIRUS AND INFECTIVE DISEASE Lesson 29: STRUCTURE OF VIRUSES

Chapter III: VIRUS AND INFECTIVE DISEASE Lesson 29: STRUCTURE OF VIRUSES . GIÁO VIÊN Dương Huỳnh Yến Linh WELCOME TO TEACHERS AND CLASS 10X2 TEACHER Dương Huỳnh Yến Linh Chapter III VIRUS AND INFECTIVE DISEASE Lesson 29 STRUCTURE OF VIRUSES Lesson 29 STRUCTURE OF VIRUSES.

WELCOME TO TEACHERS AND

CLASS 10X2!

TEACHER: Dương Huỳnh Yến Linh

Chapter III: VIRUS AND INFECTIVE

DISEASE

Lesson 29: STRUCTURE OF VIRUSES

Lesson 29: STRUCTURE OF VIRUSES

* Features

of viruses

How do viruses compare to bacterial cells?

(size, reproduce, made of cell)

Figure: Relative size of bacteria and virus

(B) (A)

 very small and they measured in nanometers (kích thước siêu nhỏ đo bằng nanomet)

* Features of viruses

Lesson 29: STRUCTURE OF VIRUSES

Figure:Components of virus (a) and components of bacterial cell(b)

 Viruses are not made of cells,( Virut không có cấu tạo tế bào)

Viruses are made out of two basic components : coat

and core .(Có cấu tạo rất đơn giản gồm: vỏ & lõi)

* Features of viruses

 Virus need a host to reproduce  an obligate intracellular parasite (Virut nhân lên nhờ bộ máy tổng hợp của tế bào chủ  kí sinh nội bào bắt buộc)

2) COAT : a protein shell that covers the genome known as

capsid (vỏ prôtêin bao bọc bên ngòai axit nucleic, còn gọi là

What is capsid?

 Capsid composed of proteinaceous subunits called capsomeres ,(capsit cấu tạo từ các đơn vị protein gọi

là capsome)

What is Nucleocapsid?

 Combination of the nucleic acid and

capsit is called the nucleocapsid (phức hợp

gồm axit nuclêic và vỏ capsit gọi là Nuclêôcapsit)

  A layer of membrane called

the envelope (some but not all viruses): a lipid bilayer and protein,spikes glycoproteins (Một

số virut còn có thêm vỏ ngoài cấu tạo gồm lipit kép và prôtêin,

các gai glicôprêtin.)

I STRUCTURE OF VIRUSES

How is viral shape determined?

II VIRAL SHAPES

How many viral shape are there? How is each shape structured?

 Helical –

capsomers are

arranged in a helix

around the viral

nucleic acid (Cấu trúc

xoắn: capsôme sắp xếp theo

chiều xoắn của axit nuclêic.Ví

dụ : virut khảm, virut cúm)

II VIRAL SHAPES

 The shape of the virus is determined by arranging capsid There are three viral

shapes

 Polyhedral : An

polyhedron is defined as

being made up of 20

equilateral triangular

faces arranged around the

surface of a sphere.(cấu tạo bởi 20 mặt tam giác đều)

 Complex: They

basically consist of

an polyhedral head attached to a

filamentous tail ( dạng hỗn hợp: đầu dạng khối, đuôi dạng xoắn)

VR Gây bệnh hô hấp

(VR dại) (VR Gây đậu mùa)

6

4 5

How Are Viruses Classified?  

• Genetic material

+ DNA viruses contain DNA as their genetic material.(ex:

Smallpox Chicken pox, Mononucleosis Herpes Simplex 1 (cold sores), Herpes Simplex 2 (genital herpes)

+ RNA viruses contain RNA as their genetic material (ex: HIV (Human Immunodeficiency Virus) 

* Presence or absence of a membranous envelope

surrounding the capsid

Compare the differences between virus and bacteria by

setting “Yes” or “ No” in the tabl

Made of cell.

Only DNA or RNA

Both DNA and RNA

Have ribosome

Reproduce No

No

No No

No Yes

Yes

Yes Yes Yes

REVIEW

Choose the best answer:

Choose the best answer:

2 How to know difference between virus and bacteria?

Not nucleic acid.

Choose the best answer:

3 Components of nucleocapsid:

Capsomeres and nucleic acid.

Capsid and nucleic acid.

Envelope and nucleic acid.

Capsid, envelope and nucleic acid.

Choose the best answer:

4 Capsid compose of many units They are called

Choose the best answer:

5, Virut không thể nuôi cấy trên môi trường bình thường như các loại vi khuẩn vì chúng:

Không có khả năng sinh trưởng.

Có kích thước rất nhỏ Chưa có cấu tạo tế bào.

Kí sinh nội bào bắt buộc

Choose the best answer:

6 Viral genome is

Single – stranded DNA.

Single or double - stranded RNA.

DNA or RNA (Single or double - stranded ) All of these

Homework

- Learn and answer the question in your textbook.

- Reading lesson 30 and answer the following

question:

1 How do viruses reproduce?

3 How do HIV infect?

2 How many steps are there in viral replication?