"You've watched too many science fiction movies, haven't you?" Wang Liangcheng did not agree with the student's point of view, and he added: "In the 80s of the last century, Thomas Cech discovered a protein-independent splicing process in the rRNA precursor of Tetrahymena, and the biologist deduced that L19RNA has strong enzyme activity and named it ribozyme. The discovery of ribozymes has led to a greater inclination that the origin of life came with RNA and then DNA and proteins, thus establishing the order of living DNA-RNA-proteins. The test center of Tetrahymena is more tricky, and it is precisely because of trickiness that the score can be opened. Please understand and memorize the above test points, the following is the second question. ”

2. When the population grows in a logical way, the characteristics of the initial period are:

A. The density growth rate is gradually accelerating;

B. Slow growth of density;

C. Density grows the fastest;

D. Density growth gradually slows down.

The classmates continue to hehe, or B.

Wang Liangcheng asked: "What about the acceleration period?"

Students: "A. ”

Wang Liangcheng asked again: "What about the transition period?"

Students: "C. ”

Wang Liangcheng slapped his thigh: "Very good, you guys!"

Students: "Teacher Wang taught well!"

"I think so too. Wang Liangcheng was very pleased, and he switched to the next page of PPT.

The content of this PPT is a summary of the knowledge points supporting the second question: the expression of the logical Sidi equation is, dN/dt=rN·(1-N/K)=r/K[K^2/4-(K/2-N)^2].

Wang Liangcheng asked again: "Can anyone tell me what is the integral formula of the logical Sidi equation?" After making the integral, please use mathematical methods to explain the reasons why the logical Sidi has different characteristics in the beginning, acceleration, transition, deceleration, and saturation periods. ”

"It's suddenly more difficult...... some students scratched their ears and cheeks, and they got stuck.

Wang Liangcheng smiled and said, "Do you really think that biology is rote memorization? No, it's not, biology is more complex and profound than any other discipline. The integral formula of the logical Sidi equation is easy to understand, and in order to save time, I will explain it directly. ”

Wang Liangcheng, who was missing three classes, made a crazy progress, he talked about the content of four lessons in one class, and finally made a summary: "I really hope that everyone will learn mathematics well, including myself, I am also continuing to improve my mathematics level, if the mathematics level is not high enough, it will be too much of a loss." Class. ”

Lan Jie strode to Wang Liangcheng's side, and he asked eagerly: "Teacher Wang, is there any recent activity in the Yangzhong Star Club?"

Aries University has a Star Club, and Aries Middle School also has it. You may not believe it, but the first instructor of the Star Club in the Sheep is actually a biology teacher.

Wang Liangcheng said with great regret: "Every spring, the students of all grades in Yangzhong are very busy with their studies, and it is difficult to organize outdoor activities, so let's talk about it in July and August." ”

Lan Jie also regretted: "Our Yangzhong Star Club only organizes outdoor activities twice a year, once in summer and once in winter, and there are too few activities, and the effect is not obvious." The starry sky in spring, summer, autumn and winter has its own characteristics, and I suggest that our Yangzhong Star Club should organize at least four outdoor starry activities every year, what do you think, Mr. Wang?"

Wang Liangcheng smiled helplessly: "Lan Jie, you still ask me about biology, I was recently killed by the head of the grade, and I am really not in the mood to organize the activities of the Star Club." Why don't you ask Ms. Tang if she's in the mood to organize an event?"

"Teacher Tang is even more in the mood, forget it, let's talk about it in July and August. There are so many questions to ask about biology and the break is too short, I'll come back to you later. ”

Lan Jie returned to his seat, and the rest of the students rushed up to surround Mr. Wang, asking for biology knowledge.

At this time, Li Zihan, who was unable to give up, turned his head and asked Lan Jie: "Has Zhang Yutong changed classes?"

Lan Jie said uncertainly: "All her books have been taken away, it should be a change class, right?" Zihan, you are the first to come to the classroom every day and the last to leave, when she sorted out the books, you didn't ask her?"

Li Zihan said depressedly: "I had something to do last night, I went home until eight o'clock after self-study, when I left, Zhang Yutong wrote English words silently in the classroom, and when I came to the classroom this morning, her desk was all empty." ”

"Everyone has their own aspirations, just go. ”

"Lan Jie, do you know which class she transferred to?"

"It's not a liberal arts class, or an international class?"

"Is it a liberal arts class or an international class?"

"Does it matter?"

"Hehe, yes, is this important?" Li Zihan smiled bitterly and didn't ask any more.

The second session is Tang Xiaoyun's physics class, before the lecture, Tang Xiaoyun announced an important personnel appointment and dismissal: "Zhang Yutong was transferred to the thirteenth class, and her position as squad leader was replaced by Chen Zixuan, the deputy squad leader, and the position of Chen Zixuan's deputy squad leader was filled by Zhu Mengqi. Don't ask, that's the arrangement. I warn you, don't bother me, I've been extremely irritable lately, and the small universe can explode at any time. The safest thing to do is to do what I arrange for you to do, and you will listen to what I say, understand?"

Ay......

Gone, she's gone.

transferred to the international class Zhang Yutong.

The classmates sighed, and the classmates were reluctant to be the approachable old squad leader of Yutong.

Yutong transferred to the international class?

This is the worst news for Li Zihan.

The vast majority of students in the international class go to study abroad after graduating from high school, and Yutong should also embark on the road of studying abroad.

"What's good abroad?" Li Zihan complained in a low voice, and then listened carefully to the class.

At lunch, Lan Jie confirmed the news 100% that Zhang Yutong was officially transferred to the second (13th) class of high school today.

Lan Jie complained very dissatisfied: "Zhang Yutong, you are walking too fast, so fast that I don't have time to invite you to dinner." ”

Zhang Yutong knocked on the bowl of porridge: "This meal, you please." ”

Lan Jie never agreed: "A bowl of porridge with preserved eggs and lean pork, a serving of rice noodles, less than 20 yuan, this is too shabby to be counted as a send-off banquet." ”

"Count, I said counting. ”

"Does it really count?"

"Lan Jie, am I saving you money?"

"Zhang Yutong, you are too gentle and virtuous. ”

"Gentle and virtuous?, but some people say that I have violent tendencies, deliberately avoid me, and even block me. Zhang Yutong asked the sky speechlessly.

"What's going on?" said Lan Jie.

Zhang Yutong looked innocent: "I pushed the shot put in the last physical education class, I pushed more than thirteen meters, and some people think that I am very strong and can play, and I will definitely be a domestic violence girl in the future, and then I will be alienated." ”

Lan Jie was suddenly excited: "The sophomore girl pushed to more than thirteen meters, super top!"

Zhang Yutong couldn't cry or laugh: "I just think the shot put is very light, like a tennis ball, and I pushed it more than thirteen meters at will." Later, I pushed again when no one was around, and this time I pushed it seriously, pushing more than fifteen meters. ”

Lan Jie's excitement intensified, and he pounded the table excitedly: "Dalitong, I'm a fan of you! Pretty girl, let's have three more barbecued pork buns!"