Which of the seven biology lessons is the most important knowledge point?
The second volume of biology in the seventh grade contained many chapters. Different chapters had important knowledge points. It was difficult to absolutely determine which lesson was the most important. For example, in the "origin of humans" section, the common ancestor of modern apes and humans was the forest ape, the chimpanzee was the closest to humans, and whether or not they could make tools was the fundamental difference between humans and animals. In the chapter of "Human nutrition", the six types of nutrients needed by the human body (sugar, fat, protein, water, mineral salt, and vitamins), the three major energy-supplying substances in the human body (sugar, fat, and protein), human growth and development, as well as the repair and regeneration of damaged cells, could not be separated from protein. The proportion and role of water in the human body, although the human body's demand for vitamins was small, it was indispensable, and other knowledge points were more critical. In the "Human Breathing" chapter, the respiratory tract (nasal cavity, throat, throat, trachea, bronchi, and pneuma) was the passage for gas to enter and leave the lungs. It had the function of cleaning, wetting, and warming the inhaled gas. The lungs were the place for gas exchange. In the content of "Blood transfusion and blood type," blood type was discovered by Austrian scientist Karl Landsteiner and had hereditary characteristics. Safe blood transfusion followed the principle of blood transfusion of the same type, and a small amount of special blood type blood could be slowly transfused in an emergency. The relevant requirements for voluntary blood donation (18 - 55 years old, good health, voluntary principle, blood donation volume requirements, etc.) were also very important. Read more exciting novels for free
Important Illustration Knowledge Points in Biology
Biology elective: an old textbook knowledge point
The following are some of the knowledge points in the old biology elective textbook: - From the biosphere to the cell: Viruses had no cell structure and needed to rely on living cells to survive. Life activities could not be separated from cells, and cells were the basic unit of biological structure and function. The structure of life system included cells, tissues, organs, systems, individuals, populations, communities, ecological systems, and biospheres. Blood was the tissue level, and skin was the organ level. Plants had no system level, and single-celled organisms could be used as individuals and cells. The most basic life system on Earth was cells. A population is the sum of the same species in a certain area, a community is the sum of all the organisms in a certain area, and an ecosystem is a unified whole formed by the interaction between the biological community and the living environment. - [Other aspects: There are relevant knowledge points in the experimental section (the experimental content in the data is not mentioned in detail).] At the same time, when preparing for the exam, he could return to the textbook to build a knowledge system, do the college entrance examination questions to maintain his hand feeling, do more knowledge points for the compulsory part, and do more questions for the elective part to consolidate (especially the experimental part). <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Hengshui High School Biology Required Knowledge Point
Hengshui High School's biology compulsory knowledge point had the following characteristics: 1. ** Cell division ** - ** Specialties ** - [Universal]: It exists in the biological world. - [Durability: Perpetual throughout the entire life process of the organism.] - [Irreversibility: Generally, differentiated cells will remain in the differentiated state until they die.] - ** stability **: The genetic material will not change during the process of division. - [Meaning: It is the basis of individual development (organ formation and functional perfection). It allows the cells in multi-celled organisms to specialize, form different tissues and organs, and improve the efficiency of physiological functions.] - [Essence: It is the result of the selective expression of luxury genes in cells under specific time, space, and environmental conditions. The DNA is not lost.] Housekeeping genes were genes expressed by all cells, and their products were necessary to maintain the basic life activities of cells, such as respiratory gene and ATP-cleaving gene. Luxury genes were genes specifically expressed by different types of cells, and their products endowed different cells with specific physiological functions, such as hemoglobin-like gene and insolin-like gene. 2. It also covered cell biology and many other aspects of knowledge. The knowledge points were rather fragmented, and there was a lot of content that needed to be memorized. It also required understanding and thinking. These knowledge points could be used in the mid-term exam, final exam, and academic level test. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Biology Knowledge Garden
The following was some information related to biological knowledge: ** 1. Basic characteristics and concepts of living beings ** 1. ** Irritability and adaptability ** - Living organisms would have a certain reaction to external stimulation. This was irritability, and it was a dynamic process. Adaptability included stress and static adaptation characteristics, such as the protective colors of animals and plants. Both were determined by genetic inheritance. 2. ** Commonality of Life ** - In terms of material basis, there were common compounds and elements, such as the types of neutrons, the types of aa, the arrangement of the structure of the DNA, the structure of the genes (including the non-coding region and the coding region), and the genetic code. These were all common manifestations of life. ** 2. Cell related knowledge ** 1. ** Cell size and structure ** - The size of the cells was at the millimeter level. Under the electron microscope, fine structures with a diameter of less than 0.2 millimeters could be seen. The smallest cell was a pathogen. - Prokaryonic cells had their own characteristics, such as no nuclear membrane, no nuclei, no embryos, only Ribosome, the cell wall was composed of peptidoglycan, inheritance did not follow the three laws, the only inheritable variation was gene mutation, no biological membrane system, the gene structure code region was continuous; Mammals mature red blood cells had no nucleus and mitochondria, did not divide, and carried out oxygen free breathing, which could be used to extract cell membrane. - As the center of the biological membrane system, the ER was connected to the cell membrane on the outside, the nuclear membrane on the inside, and the outer membrane of the mitochondria. It could fold, assemble, and add sugar groups to the protein, and then form vesicles with membranes to transport it to the Golgi apparatus for further processing and secretion. 2. ** The substances in the cells ** - The three major energy storage substances in plant cells were fat, starch, and protein, while the important energy storage substances in animal cells were mainly fat and protein. - The basic elements of protein were C, H, O, N, and S were its characteristic elements; the basic elements of the acid were C, H, O, N, and P, and P were its characteristic elements; the elements of hemoglobin were C, H, O, N, and Fe3; the elements of chlor-2 were C, H, O, N, and Fe3; the elements of indoleacetic acid were C, H, O, and N; sugar and fat did not contain mineral elements. 3. ** The life course of cells ** - The life process of cells included undifferentiated, differentiated, aging, and death. The essence of cell division was the selective expression of genes, which was regulated by the non-coding regions on both sides of the gene at the level of replication. Cell totipotency refers to the potential of differentiated cells to develop. The totipotency of animal cells can be divided into totipotency cells (such as early embryo cells of animals), pluripotency (such as embryonic cells), and specialization (such as hemopoetic stem cells). The totipotency of plant cells can be arranged into fertilized eggs, reproductive cells, and somacells. The material basis of totipotency is that the cells contain the full set of genetic materials of the species. ** 3. Bioengineering related ** 1. ** The composition of bioengineering ** - Bioengineering consisted of three major parts, namely genetic engineering, biological cell engineering (upstream technology), biological fermentation engineering, and fermentation engineering (downstream technology). - Genetic engineering tools were restriction restriction endases and DNA ligases (which acted on the phosphorous ester bond); cell engineering tools were cellases and pectinases (when obtaining protoplasts, a suitable concentration of glucose solution had to be prepared to ensure that the protoplasts were orthotropically stable), and Trypsin (used in animal cell engineering). ** 4. Energy related to living beings ** 1. **ATP** - As a direct energy source in the cell, it was in small amounts and could be converted to AAD. The physiological activities that require energy consumption include active transportation, effluxes and secretions, dark reactions, muscle contraction, nerve transmission, bioelectricity, and the synthesis of large molecular organic substances. The physiological activities that do not require energy consumption include infiltration and transpirations. The physiological activities that form ATP-are breathing and light reactions. ** 5. Human Physiology ** 1. ** Blood cells ** - Red blood cells were the most abundant in the blood, but they did not have a nucleus. Platelets also did not have a nucleus. There were no blood cells in the blood plasma, and white blood cells had a nucleus, which could be used for paternity testing. 2. ** Nephron ** - Nephron includes glomeruli, glomeruli, and glomeruli. The glomeruli had a filtering effect, and the tubulae had a reabsorption effect. The liquid in the kidney capsule was the original urine, and the urine in the original urine was not reabsorbed by the tubulae. ** 6. Biological factors that affect health ** 1. ** Pestilence caused by bacteria, viruses and genes ** - The bacteria had a cell wall and could live independently in the air and soil from animals and plants. It used to be the number one killer of human health, such as malaria and plague. Now, only some super bacteria were more difficult to deal with. However, as long as the bacteria infection did not cause large-scale organ death, multiple antibiotics could be used at the same time to cure it. - The virus did not have a cell wall and had to survive in an animal's body. It died quickly after leaving the host's body. It could not be transmitted through air or objects (except in special circumstances), but it could be transmitted through droplets. At present, there was no medical method that could attack the virus in the human body without harming the cells. After being infected with the virus, it basically relied on its own immunity to heal itself. The vaccine was an effective means to fight the virus by stimulating the immune system to produce immune cells before it was really infected to prevent the virus. The most typical disease caused by genes was cancer. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Biology elective, a must-memorize knowledge point encyclopedia, PEP edition
The following are some of the must-memorize knowledge points for the Biology elective 1 of the People's Education Version: 1. **DNA related knowledge ** - ** Dissolution **: DNA and protein have different dissolutes in different concentration of NaCl-based solutions. This feature can be used to separate DNA from impurities. DNA is not dissolved in alcohol solution, but some protein is dissolved in alcohol, which can further separate DNA and protein. - ** Resistance to acids, high temperatures, and deterrents **: The protein has no effect on DNA. Most protein cannot withstand high temperatures of 60 - 80°C, while DNA will only denature above 80°C. The deterrents can disintegrate the cell membrane, but it does not affect DNA. - ** Identification **: Under the conditions of boiling water bath, DNA will be dyed blue when it comes into contact with diamines. diamines can be used as a reagent for DNA identification. - **DNA extraction and identification of experimental materials **: Biological materials containing DNA are acceptable, but biological tissues with relatively high DNA content are better. - ** Disrupting cells to obtain the Dna-containing fluid (chicken blood cells and plant cells as examples)** - Chicken blood cells: Distilled water was added to the chicken blood cell fluid, stirred with a glass rod, and filtered to obtain the filtered fluid. Distilled water was a hypotonic liquid for chicken blood cells. A large amount of water entered the blood cells and caused them to burst. Stirring accelerated the rupture and released DNA. - Plant cells (taking onions as an example): Add the washing agent and salt to the chopped onions, stir and grind them thoroughly, and then filter them to obtain the grinding liquid. The washing agent dissolved the cell membrane, which was conducive to the release of DNA, while salt (NaCl2) was conducive to the dissolution of DNA. If the grinding was insufficient, the DNA in the nucleus would not be completely released, which would affect the results of the experiment. The filtered liquid of this step may contain impurities such as protein, glycan, and R A. - ** Removing impurities in the filtered solution **: There are three methods: one is to use the different dissolutes of DNA in different concentration of NaCl-solution; the second is to use a protein to decompose the protein but not the DNA; the third is to use the different denature temperatures of the protein and DNA. - **DNA extraction and identification procedures (onion as an example)** - Weigh 30 grams of chopped onions, add a small amount of Quartz sand to aid grinding, pour 10mL of 2-mole/L solution of NaCl3 and grind them thoroughly (onions can be treated first to reduce irritation). The purpose of grinding is to break the cells and let the DNA dissolve in the NaCl3 solution. There is no need to grind them into a porridge paste, and you can't use a whisk. - After grinding, it was filtered with a funnel and gauze to obtain the filtered liquid. - Add 20ml of 95% alcohol solution to the filtered solution (pour it slowly along the beaker wall without shaking or stirring). The upper layer of the solution will separate out a white, fibre-like viscous substance (DNA), which can be gently rolled up with a glass rod. 2. ** Traditional fermentation technology ** - ** Fruit wine making ** - ** Principle **: Yeast's anoxide-free breathing, the reaction formula is C6H12O6 → 2C2H50H +2CO2 + energy. - ** Source **: Wild yeast attached to grape skin or artificially cultivated yeast. - ** Condition **: 18 - 25 ° C, sealed, venting (CO2) at intervals. - ** Detection **: Under acidic conditions, the reaction between the alcohol and the potassium bichromate is grayish-green. - ** Fruit vinegar production ** - [Principle: Aerobic Breathing of Acetic Acid bacteria.] When O2 and sugar source were sufficient, sugar would be decomposed into vinegar; when O2 was sufficient and sugar source was insufficient, alcohol would be transformed into jumped and then into vinegar. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Beijing City Tongzhou District seventh grade biology knowledge point
How to write 800 words of biology knowledge
To write an 800-word science paper on biology, one could start from the following aspects: ** 1. Choose a theme ** Biological knowledge covers a wide range. You can choose a specific and interesting topic, such as a unique animal habit (such as the jumping principle of Mexican jumping beans), a special way of survival of plants, or the scientific mechanism behind a biological phenomenon. This ensured that the content was deep and attractive. ** 2. Collect information ** He could collect relevant information from multiple channels to ensure the accuracy and comprehensiveness of the information. If one wanted to introduce Mexican jumping beans, one had to understand the role of moth larvae, the internal structure of beans, and the relationship between this phenomenon and the environment. ** 3. Writing structure planning ** 1. ** Beginning ** - You can introduce the topic in a fascinating way, such as telling a short story related to the topic or asking an interesting question. If it was a Mexican jumping bean, it could start with,"Have you ever seen a bean that jumped on its own? In Mexico, there is a magical bean that beats as if it has a life of its own. What kind of biological mystery is hidden behind this?" 2. ** Main content ** - Explain the main points of biological knowledge in detail. As for the Mexican Jumping Bean, it was not because the bean itself had a special ability, but because of the activity of the moth larvae inside. Moths lay their eggs in immature beans. In a high temperature environment, the larvae clung tightly to the bean wall and hit the adjacent surface in order to find a cool place. The soft silk inside the beans could prevent them from being injured. This phenomenon reflected the characteristics of creatures adapting to the environment. - He could add some relevant knowledge, such as the biological classification of moths and the possible impact of this special relationship on the ecosystem. 3. ** Ending ** - Summing up the content of the article, emphasizing the importance or interest of the biological knowledge. For example,"The secret of the jumping beans in Mexico is just one of the many wonderful phenomena in the biological world. The biological world is full of endless mysteries waiting for us to explore. Every small phenomenon contains the wisdom of nature." ** 4. Language expression ** It was written in a language that was easy to understand and vivid. They should avoid using overly complicated technical terms. If they must be used, they should give a simple explanation. When describing biological phenomena, you can use figurative and personification rhetorical devices, such as "moth larvae are like little explorers, trying to find a cool shelter in the world of beans", which can make the article more readable. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Extra-cursory Interesting Biology Knowledge
Biology elective course 2: Knowledge Points
Biology elective second year of high school chapter 1 knowledge points: - Research and application of the reagent: - Pectinase: It breaks down pectins and dissects the cell wall and intercellular layer of plants, which helps to increase the juice yield of fruits and make the juice clear. Pectinase was not an type of an ester. It included polygallouronases, pectinases, pectinases, and pectinesterases. - The activity of the reagent could be expressed by the reduction of the reagent or the increase of the product in a unit of time and volume. - Control of plant pests and animal diseases: - Control policy: prevention first, comprehensive control. - Comprehensive control methods for crop pests and diseases: - Investigation of pests and diseases: According to the purpose, requirements and targets of the investigation, it can be divided into basic situation investigation, fixed-point system investigation and pest control effect investigation. The investigation was generally carried out in the form of a sample. The sample methods included chessboard, diagonal, straight, Z, and so on. There were concepts such as disease incidence rate (preliminary understanding of the harm situation), insect population reduction rate (understanding the effect after prevention and treatment), etc. The prediction of plant pests and diseases was based on the analysis and judgment of the data obtained from observation and investigation. It calculated the occurrence period, occurrence quantity, and damage degree of the pests and diseases, and issued early warnings in time for prevention and control. - Plant quarantine: The purpose is to prevent the spread of dangerous pests and weeds. The quarantine targets were seeds, seedlings, and agricultural products, including international quarantine and domestic quarantine. - Agricultural control: Take measures such as the selection of resistant varieties (such as insect-resistant tobacco), the formulation of reasonable farming systems (such as reducing the amount of pesticide used), and the establishment of scientific fertilizer and water management to directly or indirectly eliminate or suppress the occurrence and harm of diseases, insects, and weeds. Biology elective second year of high school, knowledge points: - Cell cycle and mitosis: The cell is the basic unit of an organism, and its normal growth and development requires a series of life cycles. The cell cycle referred to the entire process of cells starting from one mitosis to the next mitosis. It was mainly divided into four stages. - G1 phase (growth phase): During this period, cells grow and synthesize the required protein and organelle. - S phase (DNA replication phase): During this period, cells replicate the DNA in their genomes, ensuring that each daughter cell has complete genetic information. - G2 phase (prophase): During this period, cells grow further and are ready to enter mitosis. - M stage (mitosis stage): During this period, cells undergo mitosis, including the formation of the Spindle, nuclear division, and cell division. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
High school biology compulsory knowledge summary
1. ** Levels of life system **: The cell is the most basic life system on Earth. The life system is arranged from small to large as cell → tissue → organ → system → individual → population → community → ecosystem → biosphere. 2. ** Cell classification **: According to the cell's nucleus without a nuclear membrane as a boundary, it is divided into two categories: eukaryonic cells and protokaryonic cells. 3. ** The material foundation of life ** - ** protein **: The basic unit that makes up protein, all life activities are inseparable from protein, and it is the main bearer of life activities. - Nucleic acid: A substance that carries genetic information in cells. It plays an extremely important role in the genetic variation of organisms and the synthesis of protein. - ** Carboids **: The main energy source. - ** Fat **: A good energy storage material in the cells. The carbon chain was the backbone of the biological molecules, and the basic unit was called a single unit. For example, the single unit that made up the acid was a single acid, and the single unit that made up the sugar was a single sugar. - [Water]: It exists in the cell in the form of bound water (combined with other substances in the cell) and free water (existing in a free form and can flow freely). - ** Salt **: Most of the cells exist in the form of ions. 4. Cell theory: It was mainly established by the German botanist Schleiden and the zoologist Schwann. The content included that cells were an organism, and all animals and plants were developed from cells and composed of cells and cell products. A cell was a relatively independent unit that had its own life and played a role in the overall life formed by other cells. New cells could be produced from old cells. 5. ** Cell membrane and biological membrane system ** - The cell membrane was mainly composed of fats and protein. Phospholiptides and steroids in fats were important components of the cell membrane. Their functions were to separate the cell from the external environment, control the entry and exit of substances into the cell, and carry out information exchange between cells. - The membrane system of a living organism was composed of an organelle membrane, a cell membrane, a nuclear membrane, and other structures. The composition and structure of these biological membranes were similar, and they were closely related in structure and function. 6. Nucleus: It is the genetic information bank that controls the metabolism and inheritance of the cell. It is the control center of the cell's metabolism and inheritance. 7. ** Material Transportation ** - Protoplasma layer: The cell membrane and tonoplasts, as well as the plasma between the two membranes, are called the protoplasma layer. When the concentration of the cell fluid was lower than the concentration of the external solution, the cell would lose water, and the protoplasma layer would be more elastic than the cell wall. It would gradually separate from the cell wall and undergo plasminal separation. - Passive transport: The substances entering and leaving the cell through simple diffusing is called free diffusing; the substances entering and leaving the cell through the carrier protein is called assisted diffusing (the diffusing along the concentration slope is collectively called passive transport). - [Active Transport: Transport from the low concentration side to the high concentration side requires the assistance of carrier protein and consumes the energy released by the chemical reaction in the cell.] 8. ** Cell metabolism ** - The many chemical reactions that take place in cells at all times are collectively called cell metabolism. The energy required for a molecular to change from a normal state to an active state that was prone to chemical reactions was collectively called activation energy. The effect of an electron on the activation energy was even more significant. An electron was an organic substance produced by living cells that had the ability to catalyze. Most of the electron was a protein, and a few of them were a protein. The chemical reactions that the electron was used to catalyze were generally carried out under relatively mild conditions. - ATP-is a high-energy phosphorous acid compound in cells. The process of cell metabolism referred to the process in which organic matter underwent a series of decomposition in the cell to produce carbon dioxide or other products, releasing energy and producing ATP. Aerobic metabolism referred to the process in which cells, with the participation of oxygen, completely decompose organic matter such as glucose through the catalyst of various kinds of membranes to produce carbon dioxide and water, releasing energy and producing a lot of ATP. 9. ** Photosynthesis ** - The four light energy absorbing substances were distributed on the thylakoid membrane of the plastids. The plastids were the place for photosynthesis. - Photosynthesis referred to the process in which green plants used light energy to convert carbon dioxide and water into organic matter that stored energy and released oxygen. It included the light reaction stage (light was required to carry out) and the dark reaction stage (light or not). 10. ** Cell reproduction ** - The relationship between cell surface area and volume limited the growth of cells, and the size of cells was also limited by the control range of the nucleus. Before cells split, they had to undergo material preparation. Cell reproduction included the continuous process of material preparation and cell division. A cell that continuously divided began when one division was completed and ended when the next division was completed. It was a cell cycle. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>