Meselson and Stahl experiment

[@fatimakhan845]

This channel just helped me prepare like a whole unit in about 6 mins and 3 videos

[@anniemcmahon6778]

I had a test today, and we had to draw the lines in the test tubes, I vaguely remembered what the drawing of the experiment from the revision book looked like and I got it right?? I’ve rly impressed myself today

[@aqueltiempo1669]

I had to vibe to the music in the beginning by going back muliple times.

[@Yankee4ever2]

shit is fire

[@zafaran77]

I'm learning so much but feel like I'm at da club

[@mareig1421]

I'm a German student and I understood the experiment only with this video in a foreign language 😅Well done!👍

[@sudhanvams3513]

and your English is good

[@zuzubiee9715]

Hi from India... Namaste from India...

[@sandyaraghu6623]

Tq..u

[@sandyaraghu6623]

For easy teacher..

[@Islamic_insight552]

I'm from Pakistan🤗😂

[@thierrytrevorbusinge8186]

I loved this video; simple,precise and entertaining(the music in the background). since it has one beat all through it isn't distracting

[@buttercup1627]

The accent tho 😂
Great vid btw. Really cleared it up for me 👍🏻

[@zai7153]

even i was thinking the same, i mean he went from American- British to idk we can't call that indian either.

[@pranavivedula]

This was so helpful! You explained this in a much more precise way than my textbook! Thank you so much!

[@dr.gowriravichandran5394]

Short nd sweet.. Good one 👍..I subscribed expecting even more good videos

[@Teddy_bear796]

Thank you so much for this video ma’am. It really helped me to understand the concept

[@PetGhostAngel]

Here's a step-by-step explanation of the Meselson-Stahl experiment:
1. **Labeling DNA with Heavy Nitrogen (15N):**
- E. coli bacteria were grown in a medium containing a heavy isotope of nitrogen, specifically nitrogen-15 (15N).
- As a result, the DNA synthesized by the bacteria during this period incorporated the heavy nitrogen into its structure.
2. **Transfer to Light Nitrogen (14N) Medium:**
- After several generations of bacterial growth in the presence of heavy nitrogen, the researchers transferred the bacteria to a medium containing the more common, lighter isotope of nitrogen, nitrogen-14 (14N).
3. **DNA Sampling at Different Time Points:**
- The researchers took DNA samples from the bacteria at different time points after the switch to the light nitrogen medium.
4. **Centrifugation and Density Gradient Analysis:**
- The DNA samples were then subjected to a process called density gradient centrifugation. This technique separates molecules based on their density.
- The DNA samples were spun in a centrifuge through a density gradient, which allowed the separation of DNA molecules based on their nitrogen content.
5. **Observation of DNA Bands:**
- After centrifugation, the DNA formed bands at different positions in the density gradient tube.
- If replication followed the conservative model, the bands would show distinct heavy and light DNA molecules.
- If replication followed the semi-conservative model, the bands would show an intermediate position, indicating DNA molecules with a mix of heavy and light nitrogen.
6. **Results Confirming Semi-Conservative Replication:**
- The results of the experiment showed an intermediate band after one round of DNA replication, supporting the semi-conservative model.
- In subsequent generations, the intermediate band persisted, and new bands corresponding to fully light DNA appeared, confirming the continuous incorporation of light nitrogen into newly synthesized DNA strands.
The Meselson-Stahl experiment provided compelling evidence in favor of the semi-conservative model of DNA replication, as opposed to the conservative or dispersive models.

[@zai7153]

Person: Have you got an accent?
Yes.
The accent 📉.

[@fn5182]

Best teacher ever love from kazikistan

[@khusboothapa1991]

Subscribed for the simplicity

[@sandyaraghu6623]

Yeah ..when I searched for the missed connecting links ..I got through this vdo..thank u..dear

[@glamourguide-n8d]

the forced accent is killing me

[@dianaturalist178]

then read a book

[@lady88569]

@@dianaturalist178 It's not that deep. You don't get the implication cause you're not desi. Move along.

[@rhythmdew8928]

Preach!

[@zai7153]

same 😭😭

[@Zeeshanizhar]

Truth😂💯

[@emperoroftheuniversefrieza98]

Can someone help me at 2:18 I am confused at the one forming on time of 20mins

[@zoyausmani3213]

The Ecoli cultured in N15 was transferred into the Ecoli cultured in N14
And in the first generation we get to see the hybrid
N14N15 and later in the second generation we get to see 2 density gradient band one is the hybrid N 14 and 15 and other is the N14

[@atiranjanameshram5611]

Thank-you so much sir God bless you

[@malli9995]

That background music erritating Mee soo much.... 😕😕

[@Swapnamoh]

What an amazing explanation 👍👍🤗

[@dualltalks]

Thanks from India🇮🇳🇮🇳

[@P0P0_xyz288]

Very thoroughly explained, liked it!

[@animationsource3446]

Very easy to understand

[@patrickrowan2184]

If some N14/N14 can also be made in the second medium, why can 2 N15s not find each other here similarly?

[@fakesharma6023]

From India Namastey......

[@092vanlalawmpuia7]

What accent was that 🤣 i fuckin love it

[@YourWorstNightmare01]

Worst accent 😂

[@dayanadjadhav8197]

Sir i am a 2021 bach student so I want to neet 2021 exam date so plz I will request you give me updateds

[@arslanxhan4610]

best teacher ever love from pakistan

[@tarunvalavan1956]

Nice video simple but perfect...👌👌

[@balkarap5326]

Clear & simple, thx!

[@justbedramatic]

I still don't get it 😭

[@studywithnidhibharatwanshi8873]

Its been 7 months did you get it now ?

[@sachitsharma1661]

I love mathematics , [ 2^(n+1) ] - 2=Number of Strand of heavy isotope , n=number of divisions 🔥🔥

[@miqdadkhorakiwala4662]

What’s with that semi conservative accent?😂

[@s_manahil]

ahahaha😂😂

[@AnkitRaj-pr2ml]

hahahaha...its more like "see my conservative" ...lol..but thats the ryt way to pronounce it

[@abdurrahmanofficial7034]

Nice lectures

[@bindusheena7482]

This one reeeaaaallllyyyyyy helped me

[@alishashashasha6909]

This was a very each to understand video!!

[@thanksyoutube5551]

Thank you for this information 🌼

[@toptrendingvideos1199]

Please also upload a video on beadle and tatum

[@esmfamil5086]

AAMC should hire him to make a video for every question lol.

[@carloslozanoalcolea5588]

great video

[@Sims_beat]

Lovely and very informative 👍🏻

[@swapnapais8379]

Short simple but very useful.. thanks..

[@Chalcydony]

Well explained 👏👏

[@hariunique391]

Then after 2nd gen, only light band replicates

[@mdkausar5887]

Very well Explained.

[@neamhmcshane]

I need song name rn

[@anasfamily1631]

Well explained

[@AnjanaDebbarma-ox5el]

Thankyou so much sir ❤

[@shashwatkharod3988]

Thanks! Really helpful

[@sureshparit1729]

Nice👍

[@jawaidbhatti3254]

Very quick and complete thanks

[@saptarshirouth7650]

you have to describe it vastly

[@BiniamBeyene-nk5sr]

Thanx

[@980Daisy4]

🙂 Quite easy! Perfect understanding.💎

[@NandiniR-ib2jg]

Anyone in 2024😊

[@SohomDutta]

Yeah

[@Lavgeous]

Yup

[@Desichan_toon]

Hey! Are you from India🇮🇳

[@Sharin_2007]

Here from 2025

[@anugrahrai1318]

thanks

[@paramitadas1756]

thank you

[@sonitclef8675]

STWAANDD! LMFAO

[@n1nah]

J Summers i’m dead

[@amenaali7193]

😭

[@sonitclef8675]

@@amenaali7193 dont laugh at this insensitive shit bag

[@cmgs7]

yall lmfaooo

[@somayamahmoud5752]

Thank you.

[@sm.creation7029]

Please try to off the background music, it distrubs in hearing 🙏🙏🙏

[@rudolfgyorkei9558]

Thank You Mr.

[@emxcly2328]

Thank youuu :)

[@gunjanpharasi]

Thank you, it helped indeed..

[@kacycarson2785]

Music went crazy

[@sebastianjm5965]

very informative. :-)

[@sanjayprakash4962]

Indians reporting,!!!🦁

[@shayeestanihal8500]

Very nice

[@vedikatalele8367]

It helped.thanks

[@korosuke_robot]

neet aspirant?

[@ayzarizi]

Thank u bro u saved me

[@farhanarshad195]

This guy is an indian and trying to speak in foreign accent

[@abdoulazizdabo9064]

And what’s wrong with that.

[@711CokeSlurpies]

Wassup MCAT FL1 homies. I love you.

[@nehabookiology1415]

Tysm

[@a.mplays275]

Could visualize better by your animation thank u very much..

[@ambivert098]

Thank you .finally I got it😄

[@MayankSingh-uj6hi]

best videos

[@tha_so_ni51]

I was struggling to understand this!!!!!! Thaaaaaankssss♥️♥️♥️♥️

[@kamatchidevendiran486]

Nice

[@shareeffwity9583]

Why there is music in the background!?
It is so bad man
I couldn't concentrate at all wtf

[@santramariya849]

are u that weak lmao

[@shareeffwity9583]

@@santramariya849 Yeah actually if there is a bad annoying music that means I am weak ..
I feel sorry for you thinking that it is a sign of weakness . I wish I was strong like you
WTF man don’t make me hurt your worthless feeling , what a shame .

[@santramariya849]

@@shareeffwity9583 i was rude cuz u were rude thats all im sorry

[@hbd6390]

Hum aapke school mai admission lelege baat to ek hi hai

[@Mani-cn9vw]

👍👍👍👍

[@ramansidhu5233]

Short and gud

[@izzamaryam3940]

Woww it's very easyy

[@FoootbolFrenzyvision]

🎉

[@Kavitakukreti230]

The accent is cringing me fr

[@aarohityagi4630]

Bad background sound

[@reggaerhia4153]

this was good but her voice, the lisp..

[@Eric-ed1zl]

This guy sais strand like owen whilson sais wow.

[@Rush-i3k]

My life was a lie ..I thought it's semi conservative...but it's semeeeiiiiii conservative

[@napoleoncontreras4184]

U talk soo sloooow

[@riyapaswan3884]

I don't understood.. make it more clear next time

[@krishnadaskuduvakkode6603]

Cos you are dumb

[@harishchandranair9765]

@@krishnadaskuduvakkode6603 😂😂😂😂😂

[@anuahuja1930]

👌👍

[@SlayTYT]

I don’t understand this at all😀

[@laurax9245]

Slayyyyy

[@thajunnisakt5684]

Background music was irritating and the accent used was difficult to understand

[@YourWorstNightmare01]

Bhai bohot gandi accent hai

[@jatinthakur7887]

main bhi yehi likhne vala tha...........itna fake accent kisi ka nhi dekha maine

[@YourWorstNightmare01]

@@jatinthakur7887 sahi mei😂

[@anjaliihere_]

😂😂

[@emperor8716]

this terrible accent is killing me. 0:45 "PAWent strand" 😭

[@lucagomarteli7391]

This video did not help me, thanks though!

[@vishalnayak3992]

Nice video but I think your voice is very weird like seriously..

[@Tyler-iw4kw]

ITS STRAND S T R A N D STRAND OK

[@Jay_H0931]

stwand

[@madisonjohnson8431]

This makes absolutely no sense :(

[@rashidaislam7180]

Well explained but the accent, sounds annoying....

[@UserNn_20]

What the hell is this accent