"The Life of Cells" Cells are the basic units of life activities PPT courseware 4

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"The Life of Cells" Cells are the basic units of life activities PPT courseware 4

Knowledge review:

Think about it, what structures do animal and plant cells have?

clear goal

1. Name the types of substances contained in cells.

2. Name the function of the cell membrane in controlling the entry and exit of substances.

3. Say that mitochondria and chloroplasts in the cytoplasm are energy converters.

4. Explain the control effect of the cell nucleus on biological development and inheritance.

So, how do these substances exist in cells? What other substances are in cells?

1. Substances in cells

One type has relatively small molecules, such as water, inorganic salts, oxygen, etc. This type is called inorganic matter;

One type is those with relatively large molecules, such as sugars, lipids, proteins, nucleic acids, etc. This type is called organic matter.

Cells are alive, and they also need some substances to meet their needs during their growth. On the one hand, cells require some substances during their growth process, and at the same time, cells also produce some waste products. Think about it based on the picture below: What structure of the cell controls the entry and exit of materials?

2. The cell membrane can control the entry and exit of substances

Contact life, think about it

Have you ever eaten fresh grapes and raisins? Remember what they tasted like?

(1) Which is sweeter, fresh grapes or raisins?

(2) What happens to the sugar and water content during the drying process of fresh grapes into raisins?

(3) Are these changes related to the cell membrane? What role does the cell membrane play in the life of the cell?

Do you understand the content of the book?

Energy is obtained through energy converters. So, what are the energy converters in cells? How is it transformed?

3. There are energy converters in the cytoplasm

Conclusion: Energy is obtained through energy converters. There are chloroplasts in plant cells, which convert the energy of sunlight into chemical energy and store it in organic matter; there are mitochondria in plant cells and animal cells, which can convert chemical energy into kinetic energy.

4. The nucleus is the control center of genetic information, controlling the development and inheritance of life (genetic material: deoxyribonucleic acid DNA).

Summarize:

1. Cell life requires matter and energy.

1. Substances in cells.

(1) Inorganic substances: generally do not contain carbon, such as water and inorganic salts.

(2) Organic matter: generally contains carbon, such as sugars, fats, proteins and nucleic acids.

2. The cell membrane controls the entry and exit of substances.

3. There are energy converters in the cytoplasm.

(1) Chloroplast: light energy is converted into chemical energy.

(2) Mitochondria: Convert chemical energy into energy that cells can use.

2. The nucleus is the control center of genetic information, controlling the development and inheritance of life.

Practice!

1. Judgment of right and wrong:

1. All substances in cells are produced by themselves. ( )

2. Not all substances can pass through the cell membrane. ( )

2. Complete your point of view:

1. Genetic information exists in ( )

2. ( ) in cells controls the entry and exit of substances

3. ( ) and ( ) in cells are energy converters.

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Update Time: 2024-09-04

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

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