Huang Yuhang said with great certainty: "There is no doubt that my choice must be to apply for a chemistry major."

Ranger kindly reminded: "I heard that chemistry is a pit."

Huang Yuhang looked as if he was ready to die: "Even if it was a fire pit, I would jump in without hesitation! Chemistry is my faith, and I have no regrets to devote myself to my faith!"

In this realistic and impetuous society, there are probably only primary and secondary school students who have a little bit of faith. Langjie said sincerely: "Yuhang, your determination and faith touched me."

"Brother Jie, to be honest, I have better chemistry grades. If I go to a non-chemistry major in college, I am afraid that I will fail the subject and it will be very miserable."

"Puff, Yuhang, you're finally telling the truth!"

"But chemistry is indeed my belief, this is the truth."

"Yahang, do you have a university you like?"

"Of course I want to go to Yan University or Shuimu Chemical Institute, but my level is limited and I can't go. To be realistic, if I can get into Yang University's Chemical Institute, I will wake up laughing when I fall asleep. To be realistic, Yang University's Chemical Institute is likely to be a dream. For me, it would be very satisfied to be able to pass the first-tier line. I am not qualified to choose, the only thing I can do is to try to get the score higher as much as possible."

"Come on Yuhang, I wish you a better level. If you have any questions you don't understand in your studies, you can find me at any time. Of course, I am not as good as the teacher, but I may be more down-to-earth in answering your questions with the students' thinking."

Huang Yuhang was really moved. He said: "I am a borrowed student from Sheep. My academic status is in the sweet potato area. Many people look down on me. I ask them questions. They are polite on the surface, but they don't treat me as human. Only Brother Jie, you really care about me and help me, communicate with me with an equal attitude, and treat me as human. My grades are not good, but I am not stupid. I can feel that Brother Jie is different from them. Brother Jie, thank you!"

Huang Yuhang's simple and sincere words moved Ranjie. He said: "It's all classmates, so it's time to help each other."

"Brother Jie, I want to join you in the afternoon's biological experiment, can I do it?"

"Yes, our experiment cooperation is getting more and more tacit."

There are a lot of experimental classes today, including chemistry experiments in the morning and biology experiments in the afternoon.

Before doing biological experiments, Mr. Wang Liangcheng briefly talked about the experimental background: "Ribenol-RNA and DNA-DNA are polynucleotides formed by many single nucleotides connected through phosphate ester bonds. In nucleic acids, organic alkalis, pentose, and phosphoric acid exist in almost all molecular numbers. Generally, the method of measuring nucleic acid is to determine any of the three components. Today we do ultraviolet absorption method to determine the nucleic acid content. Without further ado, we start working!"

Determination of nucleic acid is an important experiment, and teachers and classmates attach great importance to this experiment. Langjie and Huang Yuhang were in a group, and each of them took a small test tube, numbered a and b.

The two carefully titrated 0.5 ml of sample solution, 0.5 ml of distilled water into the test tube A, and titrated 0.5 ml of sample solution and 0.5 ml of ammonium molybdate-perchloric acid into the test tube B. Then mix well, place it in the water bath for 30 minutes, centrifuge for 10 minutes.

Langjie remembers that in a physics experiment class this semester, Huang Yuhang was beaten by Tang Xiaoyun because of his ridiculous and clumsy experimental operation. Even Huang Yuhang himself admitted that he was in a deep state of trouble, lowering the average of the class.

The scholar should be treated with admiration for three days. In the morning, the chemical experiments and current biological experiments, Huang Yuhang has done the test according to the experimental requirements. His experimental operations are not extremely perfect, but they are absolutely qualified.

"Aerospace, you have learned very quickly, and the experiment has made great progress." Lanjie gave his experimental partner a pertinent evaluation.

Huang Yuhang said deeply: "If a person has no choice but to rely on, he will learn everything."

Ranjie suddenly felt distressed: "This is philosophical and a little sad."

The experimental principle of determining nucleic acid is not difficult. The experimenter needs to be careful and steady in operation. The details of micro-operation must be done well, and no slight sloppiness is allowed.

Most biological dogs do physical work. The bosses don’t need the dogs to develop their spiritual power. They are honest and careful to do the physical labor for me.

Huang Yuhang was inspired and said: "Brother Jie, the real pit is not chemistry, but biology."

"Yuan, you are still too modest. Your degree has increased, your knowledge has also increased, and your understanding of life has reached a new level. I think your recent progress can be seen with the naked eye. Your goal is definitely not the most ordinary university, okay."

"Brother Jie, this may be the closest to Zhuzhechi."

The experiment continued, and Lanjie and Huang Yuhang complemented each other. They absorbed 0.4 ml of supernatant from two test tubes and entered two 50 ml volumetric flasks, set the volume to the scale, used distilled water as a blank zero point, and measured the absorbance at 260 nm on an ultraviolet spectrophotometer.

Based on the experimental measurement results, Huang Yuhang calculated the RNA concentration and the percentage of nucleic acid content of the solid sample. Lanjie passed the review and submitted the experimental recording paper to Teacher Wang Liangcheng.

Wang Liangcheng expressed his satisfaction: "Okay, no problem, you two pack up the laboratory bench and you can leave."

Huang Yuhang took the initiative to clean up the experimental bench, and Lanjie stayed beside Wang Liangcheng and asked: "Teacher Wang, summer vacation is coming soon. Does our Starry Sky Club have any activities during the summer?"

Wang Liangcheng nodded and said, "Some."

"There is an event, right? That's great!" Ranger was very happy. He asked with anticipation: "Where will we go to watch the stars during the summer vacation?"

Wang Liangcheng replied: "Provincial Astronomical Museum."

Ranger was extremely shocked: "Ah? Go there? As we all know, the astronomical telescope at the Provincial Astronomical Museum is fake! Sorry, I correct it. The telescope at their museum is real, but it is in a state where it can only be viewed from a distance but not practical."

Wang Liangcheng said calmly: "There is an exhibition on the first and second floor exhibition halls on the museum, so we can go to see the exhibition."

Langjie was not calm: "Their entrance tickets are not charged for money. You can enter the museum with your ID card and student ID. If you just go to the exhibition hall to see the exhibition, you don't need Yangzhong to come forward to coordinate and organize it. We students can go to the exhibition by ourselves."

“Can individual act alone be the same as organized collective activities?”

"To be honest, I am definitely willing to participate in group activities. Teacher Wang, can't we go outdoors to watch stars in our group activities? I mean, wouldn't we be happy to go to a place similar to Zizi Island, set up a telescope, and look at the stars all night?"

Teacher Wang smiled bitterly: "Haha, I was taken away by the grade director again. It is impossible to organize the stars outdoors."

Lanjie stood up for Teacher Wang: "Teacher Wang, you teach biology well, are helpful in life, are deeply loved by students, and have won the trust of parents. I don't understand. How can the grade director like you be such an excellent teacher, how can you take you every day?"
Chapter completed!