Xueba God-level system

In the first few minutes of self-study, almost all the books downstairs were picked up.

At this time, Niu Zihao was sitting next to Li Min.He learned from the cloaked man that Li Min was one of the Xueba Stars.

If that's the case, it's all his own.

The Xueba Star is related to physics, so should each discipline have its own corresponding Xueba star?No one knows this for the time being, but it has long been an indisputable fact that Li Min is the first academic star.

As for the light bulb pattern on his chest, Niu Zihao didn't find it very strange.In physics, it's not surprising that there is a light bulb as a symbol.

For example, Edison failed many times to study the tungsten filament in the light bulb.From this story, we can learn his perseverance and perseverance.In fact, failure is not terrible, the terrible thing is that you do not have the courage to face failure.

Failure is the mother of success, isn't it a common saying?

Although school was only over ten minutes early, those who studied hard continued to read the book for 10 minutes, then packed their schoolbags and went home.

In the classroom, only Li Min and Niu Zihao were left.

"Let's go, go back to the dormitory and get some sleep." Niu Zihao said by the way, looking at Li Min who was still racking his brains.

"It's alright, Fanzheng is still early before I go to bed, why don't you continue to study?" Li Min only focused on reading, which was quite admirable. If he couldn't figure out a question, he would feel very uncomfortable.Until the answer is successfully answered, the excitement of that joy will arise spontaneously.

"If you want to study by yourself, then I'll go first. If I go later, the landlord will probably lock the door. By then, I'll be alone and can only sleep on the street."

"It turns out that's the case. Then don't go tonight. Come to my dormitory. There is free Wi-Fi for 24 hours. It's really good." After speaking, Li Min took out the He gave a key, "Look, this is on the door of my dormitory."

When he saw the key, Niu Zihao felt relieved.Then this matter can be regarded as not returning home at night, it should not be.The first time you hear this word, you will be implicated in bad people.But his stay tonight was related to study.

"Niu Zihao, let's take a look at this biology problem together and go back to the dormitory after finishing it." It seemed that Li Min had encountered some difficulty, and Niu Zihao must have helped him.

Niu Zihao took the mock test paper and saw that it was written: In May 1982, the Shanghai Institute of Biochemistry of the Chinese Academy of Sciences synthesized a drug that has analgesic effect but is not as addictive as morphine--enkephalin. The following is Its structure is simplified.

Since it is really complicated, it cannot be drawn, but it will not affect the fluency of problem solving.

After the picture is finished, answer accordingly:

(1) What is the chemical nature of enkephalin?What are the structural characteristics of its basic unit?

(2) If the length of the enkephalin peptide chain remains unchanged, the type and number of amino acids that make it up remain unchanged, which of them should be changed?can change its properties.

(3) Enkephalins are only effective by subcutaneous injection, but not by oral administration. What is the main reason?

(4) If enkephalins are completely hydrolyzed, water molecules are required?One, what is the product after hydrolysis?kind.

(5) Enkephalins can be identified and presented with ? reagents?color, the reason is what the compound contains?A color reaction occurred with this reagent.

Niu Zihao glanced at it, and then began to analyze the answer directly.

(1) From the analysis of the figure, enkephalin is composed of five amino acids, so its chemical nature is pentapeptide.The basic unit that makes up a polypeptide is an amino acid.

(2) The structure of a polypeptide is related to the type, number and order of amino acids constituting the polypeptide.

(3) Peptidases in the digestive tract can decompose polypeptides into amino acids.

(4) It can be seen from the figure that the molecular structure of enkephalin contains 4 peptide bonds (-CO-NH-), so 4 molecules of water are required for hydrolysis.Of the 5 amino acids obtained by hydrolysis, two of them are identical (H2N-CH2-COOH), so there are 4 kinds of products after hydrolysis.

(5) There are peptide bonds in the polypeptide, which react with the biuret reagent to produce a purple complex.

In less than 5 minutes, Niu Zihao quickly finished answering the question.

"You can go now!"

"Uh-huh."

The two of them closed the doors and windows, and then strolled through the silent night.The moon's shadow is shining brightly, hanging on the dome like a blessing, and the poignant color has always shrouded the top of the campus all the year round, how beautiful it is.

Out of the school gate, began their free life.Continue along the stone road to the right, and walk towards the lane with the Green Garden Community.With the help of the dim street lights, you can vaguely see the words "Certificate" engraved on the walls of the alley, and there are some advertisements for recruiting and buying real estate. How comfortable it is to look at.

"Classmate, would you like to have some baked rice cakes for one yuan or two?" The uncle who was drinking at the entrance of the alley quickly said when someone came over.

Li Min waved his hand habitually. Girls like to eat fried things like barbecue.For example, Xie Monroe, his tablemate, often eats this for breakfast.

Li Min also tried to persuade her several times. Girls, sometimes they are really stubborn.It's okay, just like it.

The two of them stopped in front of a small buying department.

Li Min went into the store and bought a few bottles of drinks, a bag of melon seeds, and a few packets of snacks. "We have to celebrate whatever we say tonight, because you are the first close friend I made."

"Friend, can we really do it? It's been several weeks since school started, and you've only met me, so don't you dislike my status as the last one in the class?" Niu Zihao was also moved after listening to what he said. You know, Li Min's ranking in this monthly test is in the 7th position, and his single subject score in physics is among the best in all grades.To befriend such a person, to be honest, the pressure is really bigger than a mountain.

And Li Min sighed deeply. It is not easy to make friends, and it is even more difficult to find a confidant.A person who tricks himself into going to the toilet to find a book like Cheng Biteie is not worthy of being his friend at all. It is best to hide away from this kind of person when he sees him in the future, so as to save the danger of harming others.For this reason, Li Min has always held a grudge.

"Of course we can, but are we friends for one year or three years?" Li Min opened the bag of melon seeds and grabbed a lot for Niu Zihao.

"Needless to say, I know that you study science, and I also study science. This head teacher takes geography and liberal arts, so we will be leaving after a year. In my opinion, among the top ten classes, only the first eight classes are science subjects. Classes 140 and [-] are the most powerful classes." Speaking of which, Niu Zihao actually secretly sweated on Li Min's behalf, he had to work harder if he wanted to get into the most powerful classes. "The first and second classes are the top [-] students in the senior high school entrance examination, so it is estimated that there are not many people who study liberal arts, so it is not easy to get in."

"It's okay, all we can do is work hard, and leave the rest to God's will."

While eating melon seeds, the two were chatting.And just passing by, you can always hear a few dogs barking behind you.

After a while, the two walked in from a place called Pioneer Lane and disappeared into the dark night.

In a relatively spacious landlord's house, the bicycles in the courtyard seemed to be renting students.And Li Min's room was in an inner corner of the third floor.

Stepping on the pedals of the iron stairs, the "bragging" sound should be so pleasant.

"Here it is!"

"Ah."

Seeing that a girl was pouring the water she had just washed her hair, Li Min stepped forward and said hello.The girl was a student from the nearby No. [-] Middle School. Sometimes she would often ask Li Min a few questions. Over time, the two of them got to know each other.

When I opened the door, I was greeted by the smell of garbage.It smells like it was a few days ago.

"The room is so messy, and you don't plan to clean it up." Niu Zihao's house was actually messier than this, but he was embarrassed to say it.

"It's messy, it's not messy. When I was in junior high school, it was even more messy than this." Li Min smiled, "This is normal, isn't it all boys?"

Niu Zihao glanced at the surrounding environment, his clothes were still soaked in the water basin, and there were already several pairs of socks by the bed. It really was the same for all the boys in the world.

In general, Li Min's room contains the most books.It's no wonder that he can study so well and keep books in his hands.Even the mobile phone he uses is the kind of vivo mobile phone that costs a few hundred dollars. If you want to download and play "Honor of Kings", it is estimated that you will be stuck.

"Why, you also eat instant noodles at home?" Niu Zihao asked curiously when he saw that there was half a box of Master Kang's braised beef noodles under the bed.

"Of course, this is for emergency use. In case the gas runs out one day, or if you are too lazy to cook, won't instant noodles come in handy at this time?"

Really thoughtful, Niu Zihao just smiled and didn't speak.

"Don't tell me, when I mentioned instant noodles, I was suddenly hungry. I just didn't eat tonight. Now I guess the school cafeteria has already finished get off work, there should be no food. The restaurant outside is also closed, why don't you? Let's use Meituan to deliver orders on our mobile phones."

"Okay, I'll transfer the money to you when I'm done."

"No need, we're all friends. I'll treat you this time. At worst, you can invite me later, so that we will be even." Li Min was downloading Meituan Waimai on his phone while talking. app.

But Li Min's appearance on the Internet surprised Niu Zihao, who has been on the Internet all the year round. Is this a new height?

I saw Li Min immediately took off his shoes and stood on the head of the bed, holding his mobile phone high above his head.This situation is very similar to the Statue of Liberty in New York, USA, but people are holding torches, while Li Min is holding a mobile phone.