Beljakovine so ena od najpomembnejših vrst organskih molekul v živih... Show more
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Updated Apr 1, 2026
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Beljakovine: Gradniki Življenja
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Osnove beljakovin
Beljakovine so ogromne molekule, sestavljene iz manjših delov, ki jim pravimo aminokisline. V naravi poznamo 20 različnih aminokislin, ki se kot kocke lego povezujejo v različne kombinacije.
Predstavljaj si beljakovine kot dolge ogrlice, kjer je vsak biser druga aminokislina. Te "ogrlice" se nato zvijejo v posebne oblike, ki določajo, kaj bo beljakovina počela v telesu.
Peptidna vez je močna povezava med dvema aminokislinama. Nastane tako, da se odcepi molekula vode - ta proces se imenuje kondenzacija. Ko se več aminokislin poveže skupaj, nastane polipeptid.
💡 Pomembno za test: Beljakovina ni isto kot polipeptid! Beljakovina je končni produkt, ki lahko vsebuje enega ali več polipeptidov.
Zgradba aminokislin
Vsaka aminokislina ima enako osnovno zgradbo, kot da bi bile vse narejene po istem receptu. V sredini je ogljikov atom, nanj pa so vezani štirje različni deli.
Prvi del je amino skupina , ki je bazična. Drugi del je karboksilna skupina , ki je kisla. Tretji del je preprost vodikov atom .
Najbolj zanimiv pa je četrti del - stranska veriga ali R-skupina. Ta je pri vsaki od 20 aminokislin drugačna in določa njene posebne lastnosti. Nekatere so polarne, druge nepolarne, tretje kisla, četrte bazične.
💡 Zapomni si: R-skupina je tisto, kar naredi vsako aminokislino edinstveno!
Kako nastanejo beljakovine
Proces nastanka beljakovin si lahko predstavljaš kot sestavljanje verige iz perl. Karboksilna skupina ene aminokisline se "prime" amino skupine druge aminokisline.
Pri tej reakciji se odcepi molekula vode (H2O) - to se imenuje kondenzacija ali dehidracijska sinteza. Nastala vez je peptidna vez, ki je zelo močna in trpežna.
Ko se dve aminokislini povežeta, nastane dipeptid. Tri aminokisline tvorijo tripeptid, veliko pa polipeptid. Ta dolga veriga se nato zvije v prostoru in tvori delujočo beljakovino.
Zelo pomembno je razumeti, da oblika beljakovine določa njeno funkcijo. Če se oblika spremeni, beljakovina ne more več opravljati svoje naloge - to se imenuje denaturacija.
💡 Ključna formula: Zaporedje aminokislin → 3D oblika → Specifična funkcija
Denaturacija in funkcije beljakovin
Denaturacija je proces, pri katerem beljakovina izgubi svojo značilno obliko in s tem tudi funkcijo. Najbolj pogosti vzroki so visoka temperatura in spremenjene pH vrednosti.
Denaturacija je ponavadi nepovratna - skuhanega jajca ne moreš več spremeniti nazaj v surovo! To se zgodi, ker se tridimenzionalna struktura beljakovine poruši in se ne more več pravilno sestaviti.
Beljakovine opravljajo različne naloge v telesu. Encimi pospešujejo kemijske reakcije, strukturne beljakovine dajejo oporo (npr. kolagen v koži), transportne prenašajo snovi (npr. hemoglobin kisik), obrambne pa nas ščitijo pred boleznimi.
Zapomni si glavno pravilo: že zamenjava ene same aminokisline v verigi lahko povzroči, da beljakovina ne deluje pravilno. To kaže, kako natančno je narava sestavila te molekule!
💡 Za test: Glavna vzroka denaturacije sta vročina in ekstremne pH vrednosti (zelo kislo ali bazično okolje).
We thought you’d never ask...
What is the Knowunity AI companion?
Our AI companion is specifically built for the needs of students. Based on the millions of content pieces we have on the platform we can provide truly meaningful and relevant answers to students. But its not only about answers, the companion is even more about guiding students through their daily learning challenges, with personalised study plans, quizzes or content pieces in the chat and 100% personalisation based on the students skills and developments.
Where can I download the Knowunity app?
You can download the app in the Google Play Store and in the Apple App Store.
Is Knowunity really free of charge?
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
Most popular content in Biologija
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4.6/5
App Store
4.7/5
Google Play
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user
Beljakovine: Gradniki Življenja
Beljakovine so ena od najpomembnejših vrst organskih molekul v živih bitjih. Delujejo kot "delavci" v celici in opravljajo ogromno različnih nalog v telesu, od prenašanja kisika do branjevja pred boleznimi.
Osnove beljakovin
Beljakovine so ogromne molekule, sestavljene iz manjših delov, ki jim pravimo aminokisline. V naravi poznamo 20 različnih aminokislin, ki se kot kocke lego povezujejo v različne kombinacije.
Predstavljaj si beljakovine kot dolge ogrlice, kjer je vsak biser druga aminokislina. Te "ogrlice" se nato zvijejo v posebne oblike, ki določajo, kaj bo beljakovina počela v telesu.
Peptidna vez je močna povezava med dvema aminokislinama. Nastane tako, da se odcepi molekula vode - ta proces se imenuje kondenzacija. Ko se več aminokislin poveže skupaj, nastane polipeptid.
💡 Pomembno za test: Beljakovina ni isto kot polipeptid! Beljakovina je končni produkt, ki lahko vsebuje enega ali več polipeptidov.
Sign up to see the contentIt's free!
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Zgradba aminokislin
Vsaka aminokislina ima enako osnovno zgradbo, kot da bi bile vse narejene po istem receptu. V sredini je ogljikov atom, nanj pa so vezani štirje različni deli.
Prvi del je amino skupina , ki je bazična. Drugi del je karboksilna skupina , ki je kisla. Tretji del je preprost vodikov atom .
Najbolj zanimiv pa je četrti del - stranska veriga ali R-skupina. Ta je pri vsaki od 20 aminokislin drugačna in določa njene posebne lastnosti. Nekatere so polarne, druge nepolarne, tretje kisla, četrte bazične.
💡 Zapomni si: R-skupina je tisto, kar naredi vsako aminokislino edinstveno!
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Kako nastanejo beljakovine
Proces nastanka beljakovin si lahko predstavljaš kot sestavljanje verige iz perl. Karboksilna skupina ene aminokisline se "prime" amino skupine druge aminokisline.
Pri tej reakciji se odcepi molekula vode (H2O) - to se imenuje kondenzacija ali dehidracijska sinteza. Nastala vez je peptidna vez, ki je zelo močna in trpežna.
Ko se dve aminokislini povežeta, nastane dipeptid. Tri aminokisline tvorijo tripeptid, veliko pa polipeptid. Ta dolga veriga se nato zvije v prostoru in tvori delujočo beljakovino.
Zelo pomembno je razumeti, da oblika beljakovine določa njeno funkcijo. Če se oblika spremeni, beljakovina ne more več opravljati svoje naloge - to se imenuje denaturacija.
💡 Ključna formula: Zaporedje aminokislin → 3D oblika → Specifična funkcija
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Denaturacija in funkcije beljakovin
Denaturacija je proces, pri katerem beljakovina izgubi svojo značilno obliko in s tem tudi funkcijo. Najbolj pogosti vzroki so visoka temperatura in spremenjene pH vrednosti.
Denaturacija je ponavadi nepovratna - skuhanega jajca ne moreš več spremeniti nazaj v surovo! To se zgodi, ker se tridimenzionalna struktura beljakovine poruši in se ne more več pravilno sestaviti.
Beljakovine opravljajo različne naloge v telesu. Encimi pospešujejo kemijske reakcije, strukturne beljakovine dajejo oporo (npr. kolagen v koži), transportne prenašajo snovi (npr. hemoglobin kisik), obrambne pa nas ščitijo pred boleznimi.
Zapomni si glavno pravilo: že zamenjava ene same aminokisline v verigi lahko povzroči, da beljakovina ne deluje pravilno. To kaže, kako natančno je narava sestavila te molekule!
💡 Za test: Glavna vzroka denaturacije sta vročina in ekstremne pH vrednosti (zelo kislo ali bazično okolje).
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
We thought you’d never ask...
What is the Knowunity AI companion?
Our AI companion is specifically built for the needs of students. Based on the millions of content pieces we have on the platform we can provide truly meaningful and relevant answers to students. But its not only about answers, the companion is even more about guiding students through their daily learning challenges, with personalised study plans, quizzes or content pieces in the chat and 100% personalisation based on the students skills and developments.
Where can I download the Knowunity app?
You can download the app in the Google Play Store and in the Apple App Store.
Is Knowunity really free of charge?
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
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Most popular content in Biologija
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Can't find what you're looking for? Explore other subjects.
Students love us — and so will you.
4.6/5
App Store
4.7/5
Google Play
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user