"Inorganic Matter in Cells" Molecules that make up cells PPT

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"Inorganic Matter in Cells" Molecules that make up cells PPT

Part One: Learning Objectives

1. Explain the existence form and function of water in cells.

2. Name the existence forms and main functions of inorganic salts in cells.

3. Understand the relationship between elements and compounds and living systems.

water in cells

Important inorganic compounds that make up cells

Inorganic substances in cells PPT, part 2 content: 1. The content of water in cells

(1) Water content

Conclusion 1. The water content in cells can reach 85%-90%, which is the highest content among all compounds.

Conclusion 2. Different biological species have different water contents.

Conclusion 3. The water content of the same organism is also different at different stages of growth and development.

Conclusion 4. The same species of organisms has different water contents in different tissues and organs.

(2) The existence form of water in cells

Free water Water that exists in the form of ______ and can __________.

_______ of the total water in the cell.

Features: easy to evaporate, not bound, flowable

Bound water Water that _________ with other substances within the cell.

______ of all water in cells.

It is an important component of cell structure!

Features: Not easy to lose, stable content, loss of fluidity

Important functions of water

Functions of free water:

1: Good solvent in cells;

2: Participate in biochemical reactions;

3: Transport nutrients and metabolic waste.

Combined water functions:

important component of cells

Inorganic substances in cells PPT, part 3 content: 2. Inorganic salts in cells

1. Form of existence

——Mostly exist in ionic form

Cations: Na+, K+, Ca2+, Mg2+, Fe2+, Fe3+, etc.

Anions: Cl-, SO42-, PO43-, HCO3-, etc.

——A few exist in the form of chemical compounds

2. Content: Very little, only 1%-1.5%

1. There is a kind of anemia called iron deficiency anemia. Why does iron deficiency cause anemia?

Iron is one of the main raw materials for making hemoglobin. When there is a lack of iron, hemoglobin cannot be synthesized, resulting in iron deficiency anemia.

2. Lack of magnesium in plants affects photosynthesis. Why?

Photosynthesis cannot lack chlorophyll, and magnesium is one of the constituent elements of chlorophyll. Therefore, the formation of chlorophyll is hindered when magnesium is deficient, thus affecting photosynthesis.

Physiological functions of inorganic salts

1) An important component of cells and organisms.

2) Maintain the life activities of cells and organisms.

3) Maintain cell morphology.

4) Maintain the acid-base balance of cells.

Inorganic substances in cells PPT, part 4: practice

1. The water content in jellyfish is as high as 97%, and the water in living cells is

A. All free water B. All bound water

C. Mainly free water D. Mainly bound water

2. Wheat with existing moisture content: (1) 10%, (2) 12%, (3) 14%, (4) 16%, is stored in four granaries with the same conditions. During the storage process, the organic matter The least loss is

A.(1) B.(2) C.(3) D.(4)

3. When a doctor conducted an experiment on an isolated frog heart, he found that the contraction of the frog heart could not be maintained if the frog heart was perfused with physiological saline that did not contain calcium and potassium. When perfused with a saline solution containing small amounts of calcium and potassium, the frog's heart can continue to beat for several hours. Experimental Notes Calcium Salts and Potassium Salts ()

A. Is an important component of certain complex compounds in cells

B． Plays an important role in maintaining the life activities of organisms

C. Plays an important role in maintaining cell morphology

D. Providing energy for the frog's heart to continue beating

4. When some marathon runners enter the final stage of the race, their lower limb muscles often twitch. This is because the body sweats a lot and excretes excess fat out of the body: ( )

A. Water B. Sodium salt C. Calcium salt D. Urea

5. When wheat germinates, the ratio of free water and bound water in the cells ( ).

A. Increase B. Decrease

C. Unchanged D. Unable to judge

6. Regarding the statement about the water content in living cells, which statement is incorrect ( )

A. Water is the most abundant compound in human cells.

B. The cells of the elderly contain less water than those of infants

C. The relative content of bound water in cold-resistant plants is relatively high

D. Organisms with strong metabolism have low free water content.

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Update Time: 2024-10-20

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