DNA | Biomolecules | MCAT | Khan Academy

[@brcarter1111]

OMG thank you for mentioning Rosalind Franklind and Wilkins!!!! I think She ought to be nominated for a postumous nobel prize.

[@lily14130]

Sadly, they don't give out posthumous Nobel Prizes... Rosalind Franklin died of ovarian cancer before they gave the Nobel Prizes to Watson and Crick, otherwise she would have gotten one.

[@yatogami7393]

@@lily14130 Rosalinda papers were stolen by watson

[@Anna_Marie_Music]

Sal, you blessed mystical unicorn you, thank you for blessing us with your knowledge - from every kid in america

[@imadeitt]

harry you have your mother's eyes

[@brcarter1111]

Hey Sal, love all the video's and keep up the great work at Khan Academy! At around 12:13 you draw a sequence of basepairs to illustrate how bases always find a complementary nucleotide. I took the sequence you made up, and ran it through NCBI's free BLAST tool(Basic Local Alignment Search Tool, it's like a "google" search for known DNA sequences), and it turns out that random sequence of basepairs you used is known to exist in over 100 different DNA and mDNA sequences in over 25 different organisms, including the bacteria staphylococcus pyogenes,, macaca fascicularis (the crab-eating macaque), peromyscus maniculatus (the deer mouse) and solanum tuberosum (the common potato)!!!

[@science-y9209]

Woah!! Can you draw random sequence of base pairs..

[@BULLSHXTYT]

You are crazy you know everything and teach so well...

[@hat880]

I like how MCAT biology is A-Level Biology in Uganda😭

[@papaisduniyakapapa]

In India, We Study This In High School

[@chanapolsm]

@@papaisduniyakapapa same here in thailand

[@joelbny]

@@papaisduniyakapapa Same here in US.

[@neolight2922]

and it is o level in UK , meaning grade 10

[@SearchingAbsolute]

This has sparked more curiosity in me to understand, what are gene mutations and how they might be triggered/caused ; are gene mutations just a tool for natural selection !? ; Can gene mutations be "corrected" ; If gene mutations are the basis of all cancers, then rising cancer cases throughout the world hints at rising number of gene mutations ... ?

[@momijithelesbianleftie6578]

Rising number of cancer cases is actually down to several factors. Depending on the type, pollution is one. Increased testing capabilities and also the major problem of overtesting for cancer in America. A better discriminating factor for seeing an actual increase in cancer cases is cancer fatality rate. But increased push for testing in this regard can also skew the numbers into pointing at a potential increase. Fun fact, big animals like elephants have cancer less often then us, despite having so many more cells and possibilities for genetic mutation. They have specific genes and cells in their body that combat cancer.

[@science-y9209]

Well.. cancer is triggered by pollution , diet , lifestyle just to name a few.. Carcinogens..have you heard of that..

[@giannatr06]

Thank you!! This perfectly cleared everything up for me omg

[@Punjabispitta]

Ahhhh man if you would have posted this like just 3 weeks ago, I would have gotten better than a C on my bio test. I can still use this for finals coming up but either way, I just want to say that you're the best Mr. Khan, I don't know what I'd do without you and Patrick JMT's video's. You've both helped me out so much through this semester. Y'all the real mvps :')

[@harikantnanavaty7519]

Harnoor Singh l

[@alejrandom6592]

How is school going?

[@Punjabispitta]

@@alejrandom6592 In DPT school now!

[@jewelhennajojan4609]

@@Punjabispitta Did you try taking the MCAT or did you use this video for a science class?

[@johnblackburn7715]

Fabulous informative video. Thank you. Really helpful for me (studying for my fourth degree: biomedical sciences). I knew about the four levels of protein structure organisation. I also knew about disulphide bonds between amino acids like cysteine. Your video put the two together to explain tertiary protein structural organisation being based on r group interaction. Bravo! Keep up the excellent content.

[@Beef42331]

That was amazing!

[@biorainbows4313]

Please update the biology, chemistry etc playlists. It would be of such great help finding the videos :) Thanks

[@sciencenerd7639]

Very nice. I think it would be worth mentioning that the Hershey Chase experiment established that DNA is the genetic material, and this happened quite awhile before the Watson Crick discovery.

[@bbydiego]

You should go over RNA to complete the protein group with Uracil.

[@matt-g-recovers]

Yes, these are great for pre-med students but I am a 42 year old software engineer who is looking to move to bioinformatics, these add a beautiful richness to that work as well!

[@lautaro450]

hey same here, 27 year old software engineer looking how to learn more about bioinformatics. Were you able to get a job in the industry?

[@CloudslnMyCoffee]

what are bioinformatics?

[@lolakhalid0504]

Omg is this the noted anatomist doing the explanation?

[@corincintron5902]

Khan Academy is the best!

[@picking_mahmoud_atito]

A simple and elegant explanation

[@kriss_s89]

Very helpful video! Thanks

[@azharoslan]

Manymanymany thankss Amin Khan!!

[@bur_han_han_bur]

Really helpful. Thanks

[@thegoodnegron3838]

Good video, keep it up Khan!

[@masumarizvi685]

in one of your other video you said human genome has 3 billion base pairs but in this one you told that there are 6 billion. which one is correct?

[@yashikaraghuwanshi7634]

3 billion base pairs and 6 billion bases.

[@science-y9209]

@@yashikaraghuwanshi7634 are you a premed

[@plushytelevision7521]

Good lesson on DNA!

[@sheshirshemul7354]

🎉done😊

[@arshiyashaikh2557]

Very nice video

[@cloydpineda6847]

isn't its 3 billion base pairs? enlightened me please...

[@LuisGarcia-cq9ls]

He had me thinking he new what he was talking about for a while, until he pronounced it "jif" 12:26

[@science-y9209]

So what?

[@ZahraaA95]

Thank you sal

[@cjfromvanowga]

KHAAAAAAAAAN!

[@Contradel]

What is this D N & A you're talking about? And where can I get it?

[@urianaargeros8344]

In your body.DNA is found in a cell

[@JeevanBManoj]

Question, 6B is the total pairs in then entire human body isn’t it. The individual DNA strands in cells will give less pairs isn’t it. For example DNA in cells in eyes might have a different number of pairs than DNA in skin cell. Also does the 6B include replicas in multiple cells? I imagine two cells in skin will have same DNA information

[@Ilemaurice687]

Hey

[@Ilemaurice687]

I have a question plz help me You have purchased an expensive tray of salmon sushi from a local supermarket. As you get ready to eat the sushi, you notice that the rice underneath the salmon pieces looks pinkish. You suspect that the fish has been dyed and is not actually salmon. Elaborate on an experimental strategy that will allow you to verify your suspicions and discuss the reasons behind such substitution practices.

[@purvai4701]

greGoR mendOOr

[@alejrandom6592]

I'm just a bunch of molecules tryikg to figure out how molecules work

[@AyushGupta-pc6yi]

wow

[@frnknsns]

why no actual photos of dna ??

[@Fillster]

Because there are no actual photos of DNA

[@tanuatc]

Too small for conventional methods.

[@frnknsns]

Felix Palmberg Then this is not science, it's faith...

[@tanuatc]

frnknsns All I said was that we can't take photos of them. There's other ways, don't try to make this a religion thing.

[@frnknsns]

Tanua TC what ways ?

[@shaolintexchrislightninga.8234]

Biology

[@XBladeArt]

DAMN!!!! WE GOT ALOT OF SHIT!!

[@nazmulhuda3121]

I am Bangladeshi

[@Gossypol]

You're human.

[@MrTridac]

Atta boy :)

[@yamahavenkatesh8606]

It was not audible...

[@emma-nj4bz]

Rosalind Franklin deserves better than this

[@fisherwest8173]

JIF????????

[@chrisrisnear7819]

#theworstKhanAcademyguy

[@Raddishist]

Downvoted for jif