2020 National Biology League Answer Analysis
The following are some of the answers to the 2020 National Middle School Biology League questions: 1. In the traditional Trizol method for extracting the DNA, the following compounds were used: - The main components of Trizol were carbolic acid and guanidinium thionate. The carbolic acid could dissolve the protein and lyse the cells, releasing the protein/nuclear acid substances. Therefore, option A was correct. - The function of the chopstick was to help the separation of the water phase from the organic phase and to remove the compounds in the solution, so option B was correct. - Chloric acid didn't denature the DNA. Option C was wrong. - Chloric acid could remove some fat-dissolved impurities in the sample, such as oil and fat-dissolved colors. Option D was correct. Therefore, the answer to this question was an ABD. 2. Regarding the secondary structure of the green fluorescent protein, the green fluorescent protein was surrounded by a cylindrical fence: - The region where the larger R's (such as phe, pt, and ip) were concentrated would hinder the formation of the alpha helices, so option A was wrong. - The side chain of gly was too small, so its conformations were unstable and destroyed the formation of the alpha helices. Option B was wrong. - Phe can form a beta-sheet. Option C is correct. - The peptidic chain contains a protein that can form a beta-sheet. Option D is correct. Therefore, the answer to this question was CD. 3. The purification method of the Green Phosphorescence from the E. Coli lysed solution containing the Green Phosphorescence protein with the N-terminal 6*His tag: - According to the difference in the surface of the protein, the interaction between the protein and the surface of the medium was used to separate the protein. - Ion exchange separation of protein was based on the different charges of the protein under a certain pH. - Immobilized metal ion affinity column was a method for separating and purifying His-tag protein. This gel could specifically chelate with the His-tag protein, so that the protein was firmly attached to the gel through the metal ion. Other impurity protein could not be chelated with the metal ion because it did not carry the purification tag, so it could not be attached to the gel. - Gel-phase separation was a technique that used the molecular sieve effect of the particles with a multi-pore network structure to perform elution-separation based on the difference in the relative molecular mass of the components in the sample to be separated. Therefore, immobilized metal ion affinity column was the first choice for purification of the GFlp from the E. Coli lysed solution containing the GFlp protein with the N-terminal 6*His tag. The answer was C. Read more exciting novels for free
2011 National Biology League answers and answers
Here are some of the answers to the 2011 National Biology League questions: 1. The organelle without a photon pump was the ER (Option A). 2. The mobility of a biological membrane was manifested by the fact that both membrane lipidsand membrane protein were mobile (Option A). 3. Transmembrane transport of Na and K, as well as co-transport, belonged to active transport (options A and C). 4. The main component of the Spindle formed during cell division is the microtubulus (Option C). 5. The description of the cell membrane breaking rapidly in the description of cell death is incorrect (Option D). 6. Both the plastids and the mitochondria contained protein, both contained H+-binding cozymes, and both produced ATPs (options A, B, and E). 7. The main function of the nucleus was the biogeneration of the Ribosome (Option B). 8. The best time to observe the quadrants of the same species during Meiosis was the pachyphakinete stage (Option C). 9. The base sequence of the template DNA was 5'-TGACCG-3', and the base sequence of the transcribed DNA was 5'-ACGUA-3'(Option B). <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
2023 National Biology League Hunan Division
In the 2023 National Biology League for Middle School Students (Hunan Division), many students won awards. For example, Peng Chengyuan and Zhao Ruoxi from Changsha City No.1 Middle School and Chengnan Middle School won the provincial first prize and third prize respectively; Long Hao from Taojiang No.1 Middle School and Xia Yingzhou from Taojiang No.4 Middle School won the first prize of the Biology Olympiad; Liu Junchi and Hu Jie from Hengyang City No.8 Middle School, Liu Zhenyan from Qidong County No.2 Middle School and Xiao Zhixiang from Qidong County Yuxian Middle School won the first prize. Hengyang organized 132 students from 23 high schools to participate in the competition and won 42 awards, including 4 first prizes, 12 second prizes and 26 third prizes. A student from Xintian High School won the second prize in the national competition. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
2017 Zhejiang Province National Biology League
The 2017 Zhejiang Province National Biology League was as follows: - In the National Middle School Biology League (Zhejiang Division) competition, Group A (Class I Key Middle School Group) had 38 first prize winners, 194 second prize winners, and 298 third prize winners; Group B (Non-Class I Key Middle School Group) had 77 first prize winners, 384 second prize winners, and 580 third prize winners. - In terms of the overall results of the National Middle School Biology League, 1 - 61 people won the first prize, 62 - 261 people won the second prize, and 262 - 561 people won the third prize. Among them, the top students were from many schools, such as Xiaoshi Middle School in Ningbo City, Hangzhou Xuejun Middle School in Zhejiang Province, Zhenhai Middle School in Ningbo City, etc. The top three were Zhang Zhiyi.(Total T-value: 73.26113207), Zhu Hu Minhao (Total T-value: 73.1891269), Huang Yueying (Total T-value: 71.71424172) <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
National College Entrance Examination Volume 1 Biology 2021 Answer
The answers to the Science Comprehensive Ability Test (Biology) of the National Unified Examination for College Entrance Examination in 2021 are as follows: 1. Multiple choice questions: 1. D (Mitotic DNA is located in the mitochondria matrix, not on the outer membrane of the mitochondria, and it codes for the metabolism. Option A, the existence of an electron capture protein on the thylakoid membrane of the plastids is correct; Option B, the release of the electron capture protein after the rupture of the lysomal membrane is also correct; Option C, the nuclear membrane of the cell is a double-layered membrane structure, and the nuclear pore is the channel for substances to enter and exit the nucleus. 2. B (There is also a Dna-protein complex in the karyoid of a procaryotic cell). 3. A (wheat cannot directly absorb and utilize the N <2> in the soil. Plants mainly absorb nitrogen ions such as NO - 3). 4. C (According to the diagram and the relationship between drug X and drug D in the question, the description of option C is unreasonable). (Since the answers to the non-multiple choice questions were not obtained, only partial answers to the multiple choice questions can be provided.) <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
The Analysis of the Questions and the Answer in the Biology Course of Senior High School
The following are some questions and answers that might be involved in the high school biology seminar: ** I. Problems related to the metabolism of cells ** 1. ** Question **: briefly describe the process of scientific discovery of the essence of the enzyme and the characteristics of scientific exploration. - Before Pasteur, he believed that fermentation was a pure chemical reaction and had nothing to do with life. Pasteur and Liebig respectively proposed that the fermentation in brewing was related to living yeast cells. Without living cells, sugar could not be turned into alcohol, and that the fermentation was caused by certain substances in the yeast cells, and these substances could only play a role after the yeast cells died and cracked. Through experiments, Bichner proved Liebig's point of view was correct, saying that the substance that caused fermentation was a zymase, but what exactly was the zymase was still unclear. Later, Sumner extracted urease crystals with high purity from sword bean seeds for the first time and proved that urease was a protein. This process showed that scientific discoveries were not smooth sailing. Many scientists needed to repeatedly demonstrate, debate, and experiment to reach scientific conclusions. 2. [Question: What is the relationship between the metabolism of the cell and the metabolism of the cell?] - Cell metabolism is composed of a series of chemical reactions in the cell. These reactions need to be carried out at high speed under normal temperature and pressure, and they require the catalyze of an enzyme. Because the reaction environment inside the cell was at normal temperature and pressure, in order to make the chemical reaction proceed quickly, the reaction required the activation energy to be reduced. 3. [Question: How do you determine if an protein is an protein?] - [Answer analysis: Biuret reagent can be used to determine whether this type of protein is a protein.] ** 2. Questions related to the ability to explore biological experiments ** 1. [Question: In the college entrance examination, how do you test your ability to design an experiment plan?] - For example, the 30th question of National Volume A required students to design an experimental plan to verify that protein fragments could appear in the lysomes of engulfing cells. The 32nd question of the new curriculum standard required students to design an experimental plan to test the AIDS virus in blood samples. This tested the students 'ability to use basic experimental methods and techniques to solve new problems. 2. [Question: Using genetic engineering experiments as an example, how does the biology college entrance examination test the understanding of the principles and objectives of the key links of the experiment?] - Question 38 of National Volume A used genetic engineering to express the target protein as the background. It examined the principles and purposes of the key links such as the double digestion of the plasmid-carrier and the preparation of competent cells. It allowed students to feel the rigorous and realistic characteristics of scientific research in the process of solving common problems in scientific research, so as to examine their understanding of the principles and purposes of the key links of the experiment. ** 3. Questions related to the application of biological knowledge in production and life ** 1. [Question: Give an example of how the college entrance examination biology questions reflect the application of biological knowledge in solving practical production and life problems.] - ** Answer Analysis **: Question 34 of the new curriculum standard volume mentioned the practical problem of the high yield of the female plants of the white thorn melon being favored by consumers. Students were required to use genetic crossing methods to screen out the pure hybrids of the female plants of the white thorn melon to solve the problem of high yield. Question 37 of National Volume A focused on the theme of rational use of disinfectant to reduce infectious diseases. It examined the key points of the exploration process such as microorganisms cultivation, bacteria counting, coating plates, and analysis of experimental results. It guided students to use the basic methods of scientific inquiry to solve practical problems in production and life, reflecting the application of biological knowledge in solving practical production and life problems. ** IV. Core literacy and teaching-related issues in biology ** 1. [Question: How to implement the core knowledge of biology in biology class?] - ** Answer Analysis **: Taking the classroom teaching " Passive Transportation " as an example, at the beginning of the class, the students were used to think about life phenomena, stimulate the curiosity of students to explore new knowledge, arouse the enthusiasm of students in the form of question strings, set up independent inquiry and group discussion sessions, and let students feel a sense of participation. In the teaching process, they combined life examples to understand the knowledge points, such as explaining the principle of water entering and leaving the cell. This could well fulfill the requirements of developing students 'scientific thinking and social responsibility in the core accomplishment of biology. In addition, the course " Gene Mutation " focused on the occurrence and mechanism of cancer. It guided the students to analyze and explore the concept, essence, characteristics, significance, etc. of gene mutation independently. It was also helpful to improve the students 'core biological quality. 2. ** Question **: How does the inter-school biology exchange activity promote teachers 'teaching? - Take the inter-school biology exchange between Jigang High School and Laiwu No.1 Middle School as an example. The inter-school exchange provided a platform for teachers to exchange teaching models and study school-based curriculum. Through the exchange, teachers could learn the experience of developing and implementing the biology school-based curriculum in other schools. For example, the teachers of Jigang High School realized that the content of the biology school-based curriculum in Laiwu No.1 Middle School was rich and layered. They could also learn different classroom teaching methods, such as teacher guidance and student inquiry in the classroom of Laiwu No.1 Middle School. They could truly realize the student-centered teaching mode, thus promoting the updating of teachers 'teaching ideas and the reform of teaching methods, and improving the teaching level of teachers. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
2018 Biology League Shandong
In 2018, there were many biological competitions in the Shandong Division. In the 2018 National Biology Olympiad League, students from a certain county performed well and won one first prize, two second prizes, and nine third prizes. Their results were among the best in Weifang City. At the same time, in the 2015 National Middle School Biology League (Shandong Division), the preliminary examination questions for the high school group included 80 single-choice questions with a total of 80 points, 20 multiple-choice questions with a total of 40 points, with a full score of 120 points. The examination time was 90 minutes, and there were clear requirements for the filling of the answer sheet and the way to answer it. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
2015 national examination application deputy provincial answer analysis
The answer to the 2015 national examination is as follows: - In a certain topic, there were many outstanding domestic and foreign enterprises participating in the exhibition. Most of the products exhibited were the latest research and development and had the world's leading or even the highest level. The 3D printing technology and equipment exhibition area was set up for the first time, with more than 60 domestic and foreign enterprises participating. It also provided an opportunity for the audience to make an online reservation in advance to print a 3D human body model. With the support of the Ministry of Science and Technology of the People's Republic of China, a high-tech equipment exhibition area was set up for the first time, and a number of national high-tech parks were unveiled. - In the topic of gaining inspiration from the development of China's high-speed rail, Zhongxing Corporation, and China's equipment manufacturing industry: - Our country must have a firm determination to promote independent technological innovation, not be afraid of setbacks and doubts, seize opportunities, sum up experience, and climb to the peak. - Independent technological innovation should not be afraid of strong competitors, actively explore the international market, implement the "going out" strategy, implement strict quality standards, win respect with strength, and enhance its popularity and international status. - In order to gain a foothold in international competition, Chinese enterprises must adhere to independent innovation, promote the transformation and upgrading of enterprises and industries with independent brands and technologies, and attract consumers with high-quality products. - China wanted to move from a manufacturing country to a powerful country. It had to vigorously develop the equipment manufacturing industry, improve product quality and international competitiveness through technological innovation, and pay attention to product specialization and all-round service when competing with similar international companies. - The " life-like technology " had become a feature that could not be eradicated in the real world. Technology will have humanity." in the writing of the article, it is necessary to combine the thinking of this sentence with the reality of society to create. It is required to choose the angle, have a clear and profound understanding, the reference materials are not limited to the given materials, the thinking is clear, the language is fluent, and the word count is 1000 - 1200 words. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
2023 Biology League, Shandong Province
The 2023 National Biology League for Middle School Students (Shandong Province) would be held in Jinan City. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
How to train for the National Biology Olympiad
The Biology Olympiad Course drew on a lot of information. It could expand the scope of knowledge and increase the amount of information. It also reflected the development trend of biological science and could be used to learn related knowledge. "The Complete Collection of Methods to Solve Problems in the High School Biology Olympiad" had methods to guide, thinking development, example analysis, and targeted training. The methods were flexible and ingenious, the question types were comprehensive, the thinking was clear and smooth, and the comments were just right. It could be used to improve the ability to solve problems. In addition, the (free) high school biology Olympiad training questions and analysis provided by the subject network could also be used for training. However, there was no information on how to train for the National Biology Olympiad. Sorry, I couldn't give an accurate answer. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
2023 Biology League results announced in Hunan
The results of the 2023 National Biology League for Middle School Students (Hunan Division) were announced. For example, Peng Chengyuan and Zhao Ruoxi from Changsha City No.1 Middle School and Chengnan Middle School won the provincial first prize and third prize respectively; Hengyang students won 42 awards, among which Liu Junchi and Hu Jie from Hengyang City No.8 Middle School, Liu Zhenyan from Qidong County No.2 Middle School and Xiao Zhixiang from Yuxian Middle School of Qidong County won the first prize. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>