The Story of Acids and BasesThe story of acids and bases is a long - standing one in the world of chemistry. Acids were first recognized by their sour taste, but of course, we don't taste chemicals in the lab these days for safety reasons. Bases were noted for their bitter taste and slippery feel. Acids are corrosive in nature, and strong acids can cause severe damage to materials and living tissues. Bases can also be corrosive. In the industrial world, acids and bases are used in a variety of processes. For example, acids are used in metal etching, and bases are used in the production of soaps. Understanding the properties of acids and bases is fundamental for many scientific and technological applications.
Biochemistry and biochemistry test questions and answersThe following are some examples of the first year test questions and answers on biochemical membranes:
** 1. Single choice question **
1. After mixing the protein with the protein and adding the biuret reagent after a while, the experimental phenomenon should be (C).
- [Explanation: The protein itself is a protein. Although it will break down the protein, the protein still exists in the system after the reaction. The biuret reagent can produce a purple reaction with the protein.]
2. In the following descriptions of the experiments related to the enzyme, the correct one was (A).
- Explanation: When exploring the high efficiency of an organism, one can compare the effects of different types of organisms and an organic catalyst on the same reaction. Therefore, the independent variable can be the type of organism. When exploring the specific properties of starch, the independent variable could be the type of the catalyst or the type of the catalyst; when exploring the effect of the pH on the activity of the catalyst, the independent variable was the pH; when exploring the effect of the temperature on the activity of the catalyst, the dependent variable was the activity of the catalyst, which was usually expressed by the decomposition rate of the catalyst or the production rate of the product.
3. The following description of the characteristics of the reagent and related experiments is correct (C).
- He explained, Low temperature would not cause the degeneration and inactiveness of the starch, but the activity would be reduced. In the experiment of studying the effect of temperature on the activity of starch, Fehling reagent could not be used to detect the experimental results, because Fehling reagent needed to be heated when it was used, which would interfere with the setting of the experimental temperature. The hydrogen Peroxide-the substrate-hydrogen Peroxide-would decompose automatically at high temperatures. Therefore, in the experiment of studying the effect of temperature on the activity of the starch, it was not suitable to choose hydrogen Peroxide-as the research object. Compared with an organic catalyst, the effect of the reduction of chemical reaction activation energy by the catalyst was more obvious, so the efficiency of the catalyst was higher.
4. The effect of an organism's biocatalyst was affected by factors such as pH. The following statement is wrong (A).
- "Explanation: The molecules of the pepsin have a certain shape, and their shape is specific and related to the combination of the substances. Most of the pepsin is a protein, and the strength of its effect can be expressed by the activity of the pepsin. Maltase-like pepsin can catalyze the decomposition of glucose, but it cannot catalyze the decomposition of cane sugar, which reflects the specific nature of the pepsin. The suitable pH-like pepsin is acidic. When it is added to a solution with pH10, its spatial structure will change, causing the pepsin to be deactivated.
5. The graph below shows the curve of the effect of temperature on the activity of the enzyme. The error in the analysis is (A).
- Explanation: In the picture, the temperature at point A is lower, the activity of the protein is lower, and its structure is not destroyed. The temperature at point C is too high, and the structure of the protein has been destroyed. The two structures are different. Point B represents the maximum activity of the protein.
** 2. Short Answer Questions **
1. What was the role of the protein in cell metabolism?
- The answer was that the metabolism of the cell was affected by the activity of the protein. It could reduce the activation energy of the chemical reaction, allowing the chemical reaction in the cell to proceed efficiently under mild conditions such as normal temperature and pressure.
2. Please give an example to explain the specific properties of the reagent.
- Answer: For example, amylases can catalyze the decomposition of starch into products such as glucose, but they cannot catalyze the decomposition of cane sugar. Urease could only catalyze the decomposition of carboric acid into nitrogen and carbon dioxide, but not other substances. This reflected the characteristic of the catalyst that could only catalyze one or a type of chemical reaction, which was the specific nature of the catalyst.
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How are amino acids depicted in comics?Amino acids are often represented visually as small molecules with specific structures and chemical bonds. Comics might show them interacting with other molecules in biological processes.
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2025-09-22 17:15
What are the reactions of a child lacking in acids?Children who lack the protein may have the following reactions:
1. ** Growth and development **: Physical growth and development are delayed, manifested as lower height and weight than normal children of the same age, and emaciation. This was because the basic components of protein, the lack of the protein would affect the synthesis of protein, which would affect the conversion between the body's protein and energy, causing malnutrition and affecting the normal development of the child's body organs.
2. ** Immunity **: Low immunity, easy to catch a cold and fall ill repeatedly. This is due to the lack of nutrients in the body, which affects the immune function of the body.
3. ** Nervous System **: As the deficiency develops, the nervous system will be affected. There may be symptoms such as lack of concentration, poor mental performance, memory loss, poor response, easy to be distracted, and low intelligence.
It is recommended that if a child is found to have the above symptoms, he can go to the hospital for an examination. If there is a lack of an aa, he can supplement it under the guidance of a doctor. Usually, he can also eat more foods rich in protein, such as milk, eggs, lean meat, fish, various meats (pork, beef, mutton, etc.), chicken and duck meat, soy products (soybeans, soybeans, etc.), etc. to supplement aa.
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Biochemistry novelsThere were a few novels about biochemistry that were recommended to the school. Among them," Campus Biohazard Rage " was a science fiction apocalyptic novel. It told the story of people discovering alien ruins and biochemical drugs that could change the world in mining. In addition," Doomsday Escape " was a zombie novel set in a school. It described the protagonist's survival journey in the school's zombie crisis. There were also " Doomsday Infinite Survival Game " and " School Doomsday: Zombie Siege ", which were also set in a school and told the story of the protagonist's survival in a zombie crisis. These works had a certain degree of recommendation and could be used as a recommendation for the school.
The Battle of BiochemistryThe Chronicle novel, Resident Evil, usually referred to a storyline in the Chronicle series that described a group of ordinary people fighting for survival in a mysterious Resident Evil.
The Biohazard Crisis was caused by a virus called Zombie. The infected would become aggressive zombies and pose a threat to humans. The protagonists need to survive and find a solution to the crisis. They may need to use weapons and skills to fight the zombies while facing other threats such as zombie mutants and other players.
In this story, the protagonists would usually experience many life and death trials. They needed to constantly adapt to the environment and find a way to survive. This story also usually included human nature, friendship, trust and other topics to let the readers feel the complexity of human nature and the fragility of crisis.