"Animal Cell" Cell is the basic unit of life activity PPT courseware 6

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"Animal Cell" Cell is the basic unit of life activity PPT courseware 6

Open the book and read the 46 pages of "Think and Discuss"

What do these three types of cells have in common?

How are they different from plant cells?

Experiment: Observing human oral epithelial cells

1. Rub

1. Wipe the slides and coverslips clean with clean gauze.

2. Drop

2. Place the slide on the experimental table and use a dropper to drop a drop of _______ in the center of the slide.

3. Scrape

3. Rinse your mouth with cold water. Use a sterilized toothpick to gently scrape the inner wall of the mouth a few times, and some debris will be attached to the toothpick.

discuss

1. When making temporary mounting of oral epithelial cells, why should we use saline? Is it okay to use clean water?

In physiological saline, the morphology and function of human cells can remain normal; if in clear water, human cells will absorb water and burst.

2. Why is it necessary to use dilute iodine solution to stain human oral epithelial cells?

Human oral epithelial cells are flat and generally appear colorless under a light microscope, making it difficult to observe their internal structure. After staining with dilute iodine solution, clear cell nuclei can be seen.

3. What is the basic structure of human oral epithelial cells?

The basic structure of human oral epithelial cells includes: cell membrane, cytoplasm, nucleus, mitochondria, etc.

group discussion

Xiao Ming took a clean glass slide, dropped a drop of 0.7% normal saline in the center of the glass slide, rinsed his mouth with cold boiled water, took a sterilized toothpick and gently scraped the inner wall of his mouth a few times, and then Put the toothpick into the droplet on the slide and smear it a few times, then put it under the microscope for observation.

(1) Please correct the three errors in the above content.

(2) Usually use __ to observe clear objects first. If you want to observe the cell structure located in the upper left part of the field of view in detail, you should move the slide to __ so that the cells are located at __.

Thought questions?

1. What should you drop in the center of the slide? What is the purpose? What is the concentration?

saline. Purpose: Keep the cell's original shape. The concentration is 0.9%.

2. Where are the oral epithelial cells scraped? Why should you rinse your mouth before scraping material? What should you pay attention to when scraping?

The inner wall of the human oral cavity. Remove food particles from the mouth. Scrape gently a few times to avoid damaging the mucous membrane on the inner wall of your mouth.

3. What is the purpose of placing the end with the debris attached in the water droplet on the slide and spreading it evenly?

Disperse the cells to avoid overlapping and affecting observation.

4. When using a microscope to observe human oral epithelial cells, should the field of view of the microscope be brighter or darker? Why?

dark! In order to make the boundaries between cells obvious and easy to observe.

Simulation production: making animal cell models

1. Plastic bag - cell membrane; preserved fruit - cell nucleus; agar - cytoplasm

2. To make a plant cell model based on the animal cell model, you also need to add cell walls, chloroplasts, vacuoles and other structures.

3. Edible starch, lotus root starch, etc. can replace edible agar; grapes, dates, etc. can replace preserved fruits.

In-class testing

1. The correct sequence for making temporary mounting slides of human oral epithelial cells is: ( )

① Drop a drop of normal saline ② Stain ③ Cover with a coverslip ④ Rinse your mouth with cold water ⑤ Take the oral epithelial cells and apply them

A.①②③④⑤ B.⑤④③②①

C.①④⑤③② D.④⑤①③②

2. Which one is not a structure shared by animal cells and plant cells ( )

A.Cell membrane and cytoplasm B.Nucleus and cell membrane

C. Vacuole and cell wall D. Cytoplasm and nucleus

3. The morphological characteristics of stained oral epithelial cells observed under a microscope are ( )

A.Light yellow flat irregular round shape

B.Light yellow flat regular round shape

C.Transparent flat irregular round shape

D. Transparent, flat, regular round shape

4. During the Qinghai earthquake, before processing the bodies of the victims who had no relatives to claim them at the time, in addition to numbering and taking photos of the deceased, DNA samples of the deceased were also extracted. DNA mainly exists in cells ( )

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

Operation

1. What is the basic structure of animal cells?

Answer: The basic structure of animal cells is: cell membrane, cytoplasm, nucleus, and mitochondria.

2. What are the similarities and differences in the basic structures of animal cells and plant cells?

Answer: Similar points: they all have cell membrane, cytoplasm, nucleus, and mitochondria.

Differences: Animal cells do not have cell walls, chloroplasts, and usually no vacuoles.

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"Animal Cell" Cell is the basic unit of life activity PPT courseware 7:

"Animal Cells" Cells are the basic units of life activities PPT courseware 7 Preview outline 1. What are the steps for making temporary mounts of human oral epithelial cells? 2. What are the basic structures of human oral epithelial cells? 3. What is the structural difference between animal cells and plant cells?

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Update Time: 2024-11-14

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

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