"Cells produce new cells through division" How cells constitute organisms PPT courseware 6

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"Cells produce new cells through division" How cells constitute organisms PPT courseware 6

Review the past and learn the new

1. Substances in cells

Inorganic matter

organic matter

2. Cell membrane controls the entry and exit of substances

3. Energy converters in cells

Chloroplasts (site of photosynthesis) Light energy → Chemical energy

Mitochondria (site of respiration) chemical energy → energy required for life activities

4. The nucleus is the genetic information database

DNA is the carrier of genetic information.

Gene segments on DNA that have specific genetic functions.

1. Cell growth

Cells absorb nutrients from the surrounding environment and convert them into their own substances, gradually increasing in size.

Observation: What changes occur in the nucleus and vacuole during the growth of plant cells?

Research has found that the size of a biological structure is mainly determined by the number of cells, not the size of the cells.

How do cells increase in number? Split

The shape and number of chromosomes in different organisms are different, but the number and shape of chromosomes in organisms of the same species are certain.

For example: Humans have 46 chromosomes

Drosophila has 8 chromosomes

Corn has 20 chromosomes

1. What is the number and shape of chromosomes in cells before and after division?

2. What preparations do you think the genetic material should have before cells divide?

3. How do chromosomes change during cell division?

4. Describe the process of plant cell division?

The process of plant cell mitosis:

(1) DNA replication, chromosome replication.

(2) The chromosomes are divided into two parts equally to form two nuclei.

(3) The cytoplasm is evenly divided into two parts.

(4) Grow new cell membranes and cell walls.

Practice questions

1. The order of plant cell division is...

①The cytoplasm is divided into two parts, each part contains a new nucleus

②The cell nucleus divides into two new nuclei

③New cell membrane and cell wall are formed in the center of the mother cell

Ａ.①②③ Ｂ.②①③

C.③②① D.①③②

2. Cells constantly absorb nutrients from the surrounding environment and convert them into their own substances, gradually increasing in size. This is the cell's ( )

A. Division B. Growth

C. Growth D. Merescence

3. Growth and development are basic characteristics of living things. A seed can grow into a towering tree, and a small fish in a pond can grow into a big fish. Which changes in cells are related to this...

A. cell growth

B． Cell division

C. Cytopathy

D. cell division and growth

Consolidation exercises

1. The process of one cell dividing into two cells is called ___________.

2. The growth of organisms is related to two factors:

(1) The increase in the number of cells in an organism—the result of _______.

(2) The increase in the size of biological cells—the result of ______

practice

1. During cell division, the structures evenly distributed into the two cells are:

A. Cell membrane B. Cytoplasm C. Nucleus D. Chromosome

2. An organism grows from small to large as a result of.

A. Increase in cell volume B. Increase in number of cells

C. Cell division and cell growth D. Cell division or cell growth

3. The correct order of the following steps of cell division is:

①The cytoplasm is evenly divided into two parts ②The replicated chromosomes enter two new nuclei respectively ③A new cell membrane is formed

A, ①②③ B, ③②① C, ②①③ D, ②③①

4. There are 46 chromosomes in the human cell nucleus. After two cell divisions, four cells are formed. The number of chromosomes in each cell is:

A. 92 items B. 46 items C. 23 items D. Unsure

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"Cells produce new cells through division" How cells constitute organisms PPT courseware 5 1. Teaching objectives 1. Describe the basic process of cell division. 2. Say that the number of cells in an organism increases through cell division. 3. Name the roles of chromosomes before cell division..

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"Cells produce new cells through division" How do cells constitute an organism PPT courseware 4 1. Cell growth Cell growth: The cells that constitute an organism must constantly absorb nutrients from the surrounding environment and convert them into their own substances. The volume will change from Small becomes big. reason..

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Update Time: 2024-11-22

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

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