"The Life of Cells" Cells are the basic units of life activities PPT courseware 8

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"The Life of Cells" Cells are the basic units of life activities PPT courseware 8

【Autonomous Learning】P50～52:

1. The substances in cells include two categories: _______ and _______. The former is composed of ______, ______ and _____, and the latter is composed of ______, ______, ______ and _______, and generally contains carbon.

2. ______ can control the entry and exit of substances. _____ can move in and out of cells freely, _______ can enter cells, but harmful substances cannot enter cells.

3. There are ______ and ______ energy converters in plant cells. Chloroplasts can convert ______ into _______, and mitochondria can convert ______ into _______.

[Think about it, discuss it]

Scientists research artificial skin. During the development process, the patient's skin needs to be cultured in a petri dish.

How can a patient's cells survive once they're put into a dish? What should be added to the Petri dish?

1. Substances needed for cell life

The life of living things cannot be separated from matter and energy, and the same is true for cells.

Sucrose dissolves in water

Both water and sucrose molecules are in constant motion. Sucrose dissolves in water because the moving sucrose molecules squeeze into the gaps between water molecules.

①Classification of substances in cells

substances in cells

Inorganic matter

Type: water, oxygen, inorganic salt

Characteristics: Small molecules, simple structure, generally free of carbon

organic matter

Types: carbohydrates, lipids, proteins and nucleic acids

Characteristics: Large molecules, complex structures, generally containing carbon

②The cell membrane controls the entry and exit of substances

The cell membrane separates the inside and outside of the cell. The cell membrane has a structure suitable for transport. It allows the substances needed by the cell to enter and keeps some substances out. Cells will produce some unnecessary or harmful substances during their life, and these substances must also be excreted through the cell membrane.

【Standard Compliance Test】

1. Multiple choice questions

1. The most abundant substance in cells is ( )

A. Water B. Sugar

C. Protein D. Inorganic salt

2. ① Cytoplasm ② Chloroplast ③ Mitochondria ④ In the vacuole, the energy converter is ( )

A、①② B、②③

C、③④ D、①④

3. In an animal cell, the cell structure that allows sugar substances to enter the cell and expels carbon dioxide and blocks it out of the cell is: ( )

A. Cytoplasm B. Cell wall C. Cell membrane D. Vacuole

4. In the leaf cells of green plants, the place where photosynthesis occurs is

①, it can convert the ② absorbed by chlorophyll and other pigments into ③ and store it in the organic matter it produces. The above ①②③ respectively represent ( )

A. Mitochondria, light energy, chemical energy

B.Chloroplasts, chemical energy, light energy

C. Cell nucleus, chemical energy, light energy

D.Chloroplasts, light energy, chemical energy

2. Judgment questions

1. Chloroplasts are unique to plant cells, and mitochondria are unique to animal cells. ( )

2. The cell membrane completely seals the cell. ( )

3. The combination of organic matter and oxygen can release energy through complex changes. ( )

4. Chloroplasts convert light energy into chemical energy, and mitochondria convert chemical energy into light energy. ( )

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Update Time: 2024-09-07

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

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