"The Life of Cells" Cells are the basic units of life activities PPT courseware 6

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"The Life of Cells" Cells are the basic units of life activities PPT courseware 6

Think about it, discuss it

In order to solve the problem of skin grafting for patients with extensive burns, scientists have developed artificial skin. During the development process, human skin cells need to be cultured in culture bottles.

How can we keep these cells alive in culture bottles? What should be added to the culture flask? Try making your own guesses!

(1) Nutrient (synthetic culture medium)

(2) Sterile and non-toxic environment

(3) Suitable temperature and pH value

(4) Suitable gas environment (oxygen and carbon dioxide), etc.

Glucose, amino acids, inorganic salts, vitamins and animal serum should be added to the culture bottle.

1. Cell life requires matter and energy

Think: What substances do they mainly contain? What does it mean?

Explain that the life of cells requires water, sugar, fat, protein, inorganic salts and other substances.

Substances are composed of molecules, which are divided into small molecule substances (water and inorganic salts, etc.) and macromolecular substances (sugar, fat, protein, etc.). And the molecules are constantly in motion.

discuss:

1. Can substances made of molecules move in and out of cells freely? Why?

No, because the cell membrane separates the inside of the cell from the outside environment, giving the cell a relatively stable internal environment.

2. Is the color of the water the same after washing the spinach in cold water and blanching it in hot water? Why?

When spinach is boiled in boiling water, the permeability of the cell membrane is destroyed and chlorophyll leaks out, causing the water to turn green.

The cell membrane controls the movement of substances into and out of the cell:

⑴Let useful substances enter cells;

⑵Keep some substances out of cells;

⑶Excrete the waste products produced in the cells out of the cells.

The cell membrane is a permselective membrane that is selective for substances entering and leaving the cell. Generally speaking, substances that are beneficial to cells can enter, but harmful or useless substances cannot enter. At the same time, waste products produced in cells can be discharged, so it can control the entry and exit of substances.

2. The nucleus is the control center

discuss:

1. What do A.B.C sheep provide?

Sheep A provided the anucleate egg cells

Sheep B provided the nucleus

C sheep provide a place for embryonic development

2. Who does Dolly look like?

Ewe B who provided the nucleus

3. Explain where genetic information resides?

Genetic information resides in the cell nucleus, which controls the development and inheritance of organisms.

There is a very magical genetic material in the nucleus of the cell, its name is DNA (deoxyribonucleic acid), and DNA contains all the information that guides biological development.

Due to the existence of DNA, the genetic material, the nucleus becomes the control center of the entire cell.

The life of cells is the unity of matter, energy and information.

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Update Time: 2024-11-18

This template belongs to biology courseware People's Education Edition seventh grade biology volume 1 industry PPT template

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