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Updated May 20, 2026

8 pages

Osnove izražanja genov in sinteza proteinov

Izražanje genov je temeljni proces, ki omogoča celicam, da iz... Show more

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# Izražanje genov

Uvod v izražanje genov

Izražanje genov je osrednji proces v biologiji, kjer se informacija, zapisana v
genu (zaporedje n

Uvod v izražanje genov

Ko se vprašaš, kako celica "ve", kdaj mora narediti določen protein, je odgovor v izražanju genov. To je proces, kjer se informacija iz DNA pretvori v funkcionalen produkt - običajno protein.

Gen je osnovna enota dedovanja - odsek DNA, ki nosi navodila za tvorbo določenega proteina. Celoten proces poteka v dveh glavnih korakih: transkripcija (prepisovanje DNA v mRNA) in translacija (prevajanje mRNA v protein).

Ključne molekule, ki jih moraš poznati, so mRNA (prenašalka informacij), tRNA (prinaša aminokisline) in rRNA (sestavni del ribosomov). RNA-polimeraza je encim, ki piše mRNA po DNA predlogi, kodon pa je trojica nukleotidov, ki določa, katera aminokislina pride na vrsto.

💡 Zapomni si: Genetski kod deluje kot slovar - vsaka trojica črk (kodon) pomeni eno aminokislino!

# Izražanje genov

Uvod v izražanje genov

Izražanje genov je osrednji proces v biologiji, kjer se informacija, zapisana v
genu (zaporedje n

Transkripcija - prepisovanje genov

Transkripcija je prvi korak, kjer RNA-polimeraza "prebere" DNA in napiše komplementarno mRNA kopijo. Pri evkariontih poteka v jedru, pri prokariontih pa v citoplazmi.

Proces se začne z iniciacijo, kjer se RNA-polimeraza veže na promotor - "start" signal na DNA. Dvojna vijačnica se razvije in encim začne svojo nalogo. Sledi elongacija, kjer se RNA-polimeraza premika po matrični verigi DNA in dodaja ribonukleotide v smeri 5' → 3'. Pomembno: namesto timina (T) uporablja uracil (U)!

Terminacija nastopi, ko encim doseže terminator - "stop" signal. Pri evkariontih sledi še post-transkripcijska obdelava: izrezovanje intronov, dodajanje 5' kape in 3' poli-A repa. Šele tako nastane zrela mRNA, pripravljena za transport v citoplazmo.

💡 Pametno: Kodirajoča veriga DNA ima enako zaporedje kot mRNA (le T namesto U) - uporabi to za preverjanje!

# Izražanje genov

Uvod v izražanje genov

Izražanje genov je osrednji proces v biologiji, kjer se informacija, zapisana v
genu (zaporedje n

Obdelava mRNA pri evkariontih

Sveže napisana pre-mRNA še ni pripravljena za uporabo - potrebuje "urejanje". Ta proces vključuje tri ključne korake, ki so edinstveni za evkarionte.

Prvo je izrezovanje intronov (splicing), kjer se nekodirajoči odseki (introni) odstranijo, kodirajoči odseki (eksoni) pa se spojijo. Ta proces omogoča alternativno izrezovanje - iz istega gena lahko nastanejo različni proteini!

Dodajanje 5' kape ščiti mRNA pred razgradnjo in omogoča vezavo na ribosom. 3' poli-A rep 50250adeninov50-250 adeninov dodatno stabilizira molekulo in olajša transport iz jedra. Šele po vseh teh spremembah je mRNA zrela za translacijo.

💡 Razlika: Prokarionti nimajo intronov, zato njihova mRNA ne potrebuje obdelave!

# Izražanje genov

Uvod v izražanje genov

Izražanje genov je osrednji proces v biologiji, kjer se informacija, zapisana v
genu (zaporedje n

Genetski kod in priprava na translacijo

Genetski kod je univerzalni "slovar" življenja, ki velja od bakterij do človeka. Je tripleten 3nukleotidi=1aminokislina3 nukleotidi = 1 aminokislina, nedvoumen (vsak kodon pomeni le eno aminokislino) in degeneriran (večina aminokislin ima več kodonov).

Pred translacijo se mora vsaka aminokislina vezati na svojo tRNA molekulo. To reakcijo katalizira aminoacil-tRNA-sintetaza in porabi ATP. Vsaka tRNA ima antikodon, ki se pari s komplementarnim kodonom na mRNA.

Start kodon AUG kodira metionin in začne translacijo, stop kodoni (UAA, UAG, UGA) pa je končajo. Ta sistem omogoča natančno "branje" genetskih navodil in sintezo pravilnih proteinov.

💡 Zapomniti: Če se kodon spremeni zaradi mutacije, se lahko spremeni celoten protein!

# Izražanje genov

Uvod v izražanje genov

Izražanje genov je osrednji proces v biologiji, kjer se informacija, zapisana v
genu (zaporedje n

Translacija - sinteza proteinov

Translacija poteka na ribosomih v citoplazmi in vključuje štiri glavne faze. Najprej se v iniciaciji mala ribosomska podenota veže na mRNA in najde start kodon AUG. Pridruži se velika podenota in nastane funkcionalen ribosom.

Elongacija je srce procesa: na A-mesto ribosoma vstopi tRNA z ustreznim antikodonom, rRNA katalizira nastanek peptidne vezi, ribosom se pomakne za en kodon naprej (translokacija). "Izrabljena" tRNA zapusti ribosom preko E-mesta.

Terminacija nastopi pri stop kodonu, kjer se veže sprostitveni faktor. Polipeptidna veriga se sprosti in celoten kompleks razpade. Tako nastane nov protein, pripravljen za svojo nalogo v celici.

💡 Predstavljaj si: Ribosom je kot tovarna, ki "bere" navodila (mRNA) in sestavlja produkt (protein) iz surovin (aminokislin)!

# Izražanje genov

Uvod v izražanje genov

Izražanje genov je osrednji proces v biologiji, kjer se informacija, zapisana v
genu (zaporedje n

Praktični primeri in mutacije

Poglejmo konkreten primer: DNA zaporedje 3'-TAC CGT ACT-5' (matrična veriga) da mRNA 5'-AUG GCA UGA-3'. To se prevede v Met-Ala, ker je UGA stop kodon.

Točkovne mutacije lahko drastično spremenijo protein. Pri srpastocelični anemiji se en sam nukleotid spremeni: GAG (glutaminska kislina) → GUG (valin). Ker je glutaminska kislina hidrofilna, valin pa hidrofoben, se hemoglobin deformira in povzroči bolezen.

Ta primer kaže, kako kritično je natančno "branje" genetskega koda. Ena napaka lahko povzroči resne posledice, zato imajo celice različne mehanizme za preverjanje in popravljanje napak.

💡 Ključno spoznanje: Genetski kod je tako občutljiv, da lahko ena spremenjena črka povzroči resno bolezen!

# Izražanje genov

Uvod v izražanje genov

Izražanje genov je osrednji proces v biologiji, kjer se informacija, zapisana v
genu (zaporedje n

Razlike med prokarionti in evkarionti

Prokarionti imajo sklopljeno transkripcijo in translacijo - oba procesa potekata sočasno v citoplazmi. Njihovi geni večinoma nimajo intronov, zato mRNA ne potrebuje obdelave.

Evkarionti imajo procesa ločena: transkripcija v jedru, translacija v citoplazmi. Jedrna ovojnica omogoča post-transkripcijsko obdelavo mRNA. Njihovi geni vsebujejo introne in eksone, kar omogoča alternativno izrezovanje.

Ta razlika je ključna za razumevanje evolucije - evkarionti lahko iz istega gena naredijo več različnih proteinov, kar povečuje njihovo prilagodljivost. Prokarionti so enostavnejši, a zato hitrejši pri odzivanju na spremembe.

💡 Za maturo: Ta tabela je pogosto vprašanje - obvladaj razlike med tema dvema skupinama!

# Izražanje genov

Uvod v izražanje genov

Izražanje genov je osrednji proces v biologiji, kjer se informacija, zapisana v
genu (zaporedje n

Hiter povzetek za ponavljanje

Celoten proces: DNA → (transkripcija v jedru) → pre-mRNA → (obdelava) → zrela mRNA → (transport) → (translacija na ribosomih) → Protein.

Transkripcija: RNA-polimeraza + DNA matrica = mRNA. Faze: iniciacija (promotor), elongacija (5'→3'), terminacija (terminator). Translacija: ribosom + mRNA + tRNA = protein. Kodoni določajo aminokisline, start je AUG, stop so UAA/UAG/UGA.

Genetski kod je univerzalen, tripleten in degeneriran. Ključne molekule: DNA (shramba), mRNA (glasnik), tRNA (dostavljavec), rRNA (katalizator). Pri evkariontih dodaj še obdelavo mRNA!

💡 Zadnji nasvet: Vadi s konkretnimi zaporedji - pretvarjanje DNA→mRNA→protein je pogosto na testih!



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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

 

Biologija

32

Updated May 20, 2026

8 pages

Osnove izražanja genov in sinteza proteinov

Izražanje genov je temeljni proces, ki omogoča celicam, da iz genetskih informacij v DNA proizvajajo potrebne proteine. Celoten proces sledi centralni dogmi molekularne biologije: DNA → RNA → Protein.

# Izražanje genov

Uvod v izražanje genov

Izražanje genov je osrednji proces v biologiji, kjer se informacija, zapisana v
genu (zaporedje n

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Access to all documents

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Join milions of students

Uvod v izražanje genov

Ko se vprašaš, kako celica "ve", kdaj mora narediti določen protein, je odgovor v izražanju genov. To je proces, kjer se informacija iz DNA pretvori v funkcionalen produkt - običajno protein.

Gen je osnovna enota dedovanja - odsek DNA, ki nosi navodila za tvorbo določenega proteina. Celoten proces poteka v dveh glavnih korakih: transkripcija (prepisovanje DNA v mRNA) in translacija (prevajanje mRNA v protein).

Ključne molekule, ki jih moraš poznati, so mRNA (prenašalka informacij), tRNA (prinaša aminokisline) in rRNA (sestavni del ribosomov). RNA-polimeraza je encim, ki piše mRNA po DNA predlogi, kodon pa je trojica nukleotidov, ki določa, katera aminokislina pride na vrsto.

💡 Zapomni si: Genetski kod deluje kot slovar - vsaka trojica črk (kodon) pomeni eno aminokislino!

# Izražanje genov

Uvod v izražanje genov

Izražanje genov je osrednji proces v biologiji, kjer se informacija, zapisana v
genu (zaporedje n

Sign up to see the contentIt's free!

Access to all documents

Improve your grades

Join milions of students

Transkripcija - prepisovanje genov

Transkripcija je prvi korak, kjer RNA-polimeraza "prebere" DNA in napiše komplementarno mRNA kopijo. Pri evkariontih poteka v jedru, pri prokariontih pa v citoplazmi.

Proces se začne z iniciacijo, kjer se RNA-polimeraza veže na promotor - "start" signal na DNA. Dvojna vijačnica se razvije in encim začne svojo nalogo. Sledi elongacija, kjer se RNA-polimeraza premika po matrični verigi DNA in dodaja ribonukleotide v smeri 5' → 3'. Pomembno: namesto timina (T) uporablja uracil (U)!

Terminacija nastopi, ko encim doseže terminator - "stop" signal. Pri evkariontih sledi še post-transkripcijska obdelava: izrezovanje intronov, dodajanje 5' kape in 3' poli-A repa. Šele tako nastane zrela mRNA, pripravljena za transport v citoplazmo.

💡 Pametno: Kodirajoča veriga DNA ima enako zaporedje kot mRNA (le T namesto U) - uporabi to za preverjanje!

# Izražanje genov

Uvod v izražanje genov

Izražanje genov je osrednji proces v biologiji, kjer se informacija, zapisana v
genu (zaporedje n

Sign up to see the contentIt's free!

Access to all documents

Improve your grades

Join milions of students

Obdelava mRNA pri evkariontih

Sveže napisana pre-mRNA še ni pripravljena za uporabo - potrebuje "urejanje". Ta proces vključuje tri ključne korake, ki so edinstveni za evkarionte.

Prvo je izrezovanje intronov (splicing), kjer se nekodirajoči odseki (introni) odstranijo, kodirajoči odseki (eksoni) pa se spojijo. Ta proces omogoča alternativno izrezovanje - iz istega gena lahko nastanejo različni proteini!

Dodajanje 5' kape ščiti mRNA pred razgradnjo in omogoča vezavo na ribosom. 3' poli-A rep 50250adeninov50-250 adeninov dodatno stabilizira molekulo in olajša transport iz jedra. Šele po vseh teh spremembah je mRNA zrela za translacijo.

💡 Razlika: Prokarionti nimajo intronov, zato njihova mRNA ne potrebuje obdelave!

# Izražanje genov

Uvod v izražanje genov

Izražanje genov je osrednji proces v biologiji, kjer se informacija, zapisana v
genu (zaporedje n

Sign up to see the contentIt's free!

Access to all documents

Improve your grades

Join milions of students

Genetski kod in priprava na translacijo

Genetski kod je univerzalni "slovar" življenja, ki velja od bakterij do človeka. Je tripleten 3nukleotidi=1aminokislina3 nukleotidi = 1 aminokislina, nedvoumen (vsak kodon pomeni le eno aminokislino) in degeneriran (večina aminokislin ima več kodonov).

Pred translacijo se mora vsaka aminokislina vezati na svojo tRNA molekulo. To reakcijo katalizira aminoacil-tRNA-sintetaza in porabi ATP. Vsaka tRNA ima antikodon, ki se pari s komplementarnim kodonom na mRNA.

Start kodon AUG kodira metionin in začne translacijo, stop kodoni (UAA, UAG, UGA) pa je končajo. Ta sistem omogoča natančno "branje" genetskih navodil in sintezo pravilnih proteinov.

💡 Zapomniti: Če se kodon spremeni zaradi mutacije, se lahko spremeni celoten protein!

# Izražanje genov

Uvod v izražanje genov

Izražanje genov je osrednji proces v biologiji, kjer se informacija, zapisana v
genu (zaporedje n

Sign up to see the contentIt's free!

Access to all documents

Improve your grades

Join milions of students

Translacija - sinteza proteinov

Translacija poteka na ribosomih v citoplazmi in vključuje štiri glavne faze. Najprej se v iniciaciji mala ribosomska podenota veže na mRNA in najde start kodon AUG. Pridruži se velika podenota in nastane funkcionalen ribosom.

Elongacija je srce procesa: na A-mesto ribosoma vstopi tRNA z ustreznim antikodonom, rRNA katalizira nastanek peptidne vezi, ribosom se pomakne za en kodon naprej (translokacija). "Izrabljena" tRNA zapusti ribosom preko E-mesta.

Terminacija nastopi pri stop kodonu, kjer se veže sprostitveni faktor. Polipeptidna veriga se sprosti in celoten kompleks razpade. Tako nastane nov protein, pripravljen za svojo nalogo v celici.

💡 Predstavljaj si: Ribosom je kot tovarna, ki "bere" navodila (mRNA) in sestavlja produkt (protein) iz surovin (aminokislin)!

# Izražanje genov

Uvod v izražanje genov

Izražanje genov je osrednji proces v biologiji, kjer se informacija, zapisana v
genu (zaporedje n

Sign up to see the contentIt's free!

Access to all documents

Improve your grades

Join milions of students

Praktični primeri in mutacije

Poglejmo konkreten primer: DNA zaporedje 3'-TAC CGT ACT-5' (matrična veriga) da mRNA 5'-AUG GCA UGA-3'. To se prevede v Met-Ala, ker je UGA stop kodon.

Točkovne mutacije lahko drastično spremenijo protein. Pri srpastocelični anemiji se en sam nukleotid spremeni: GAG (glutaminska kislina) → GUG (valin). Ker je glutaminska kislina hidrofilna, valin pa hidrofoben, se hemoglobin deformira in povzroči bolezen.

Ta primer kaže, kako kritično je natančno "branje" genetskega koda. Ena napaka lahko povzroči resne posledice, zato imajo celice različne mehanizme za preverjanje in popravljanje napak.

💡 Ključno spoznanje: Genetski kod je tako občutljiv, da lahko ena spremenjena črka povzroči resno bolezen!

# Izražanje genov

Uvod v izražanje genov

Izražanje genov je osrednji proces v biologiji, kjer se informacija, zapisana v
genu (zaporedje n

Sign up to see the contentIt's free!

Access to all documents

Improve your grades

Join milions of students

Razlike med prokarionti in evkarionti

Prokarionti imajo sklopljeno transkripcijo in translacijo - oba procesa potekata sočasno v citoplazmi. Njihovi geni večinoma nimajo intronov, zato mRNA ne potrebuje obdelave.

Evkarionti imajo procesa ločena: transkripcija v jedru, translacija v citoplazmi. Jedrna ovojnica omogoča post-transkripcijsko obdelavo mRNA. Njihovi geni vsebujejo introne in eksone, kar omogoča alternativno izrezovanje.

Ta razlika je ključna za razumevanje evolucije - evkarionti lahko iz istega gena naredijo več različnih proteinov, kar povečuje njihovo prilagodljivost. Prokarionti so enostavnejši, a zato hitrejši pri odzivanju na spremembe.

💡 Za maturo: Ta tabela je pogosto vprašanje - obvladaj razlike med tema dvema skupinama!

# Izražanje genov

Uvod v izražanje genov

Izražanje genov je osrednji proces v biologiji, kjer se informacija, zapisana v
genu (zaporedje n

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Celoten proces: DNA → (transkripcija v jedru) → pre-mRNA → (obdelava) → zrela mRNA → (transport) → (translacija na ribosomih) → Protein.

Transkripcija: RNA-polimeraza + DNA matrica = mRNA. Faze: iniciacija (promotor), elongacija (5'→3'), terminacija (terminator). Translacija: ribosom + mRNA + tRNA = protein. Kodoni določajo aminokisline, start je AUG, stop so UAA/UAG/UGA.

Genetski kod je univerzalen, tripleten in degeneriran. Ključne molekule: DNA (shramba), mRNA (glasnik), tRNA (dostavljavec), rRNA (katalizator). Pri evkariontih dodaj še obdelavo mRNA!

💡 Zadnji nasvet: Vadi s konkretnimi zaporedji - pretvarjanje DNA→mRNA→protein je pogosto na testih!

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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.

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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🤍🤍

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iOS user

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Paul T

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