Molecular structure of DNA | Macromolecules | Biology

Molecular structure of DNA | Macromolecules | Biology | Khan Academy

Рет қаралды 451,271

9 жыл бұрын

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Molecular structure of DNA. Nucleotide. Nitrogenous base, phosphate.
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Пікірлер: 64

@jeromekrammes2031 6 жыл бұрын

I feel like he is saying nucleotide like that just to frustrate me.

@yourfavouritescepticx8969 4 жыл бұрын

Jerome Krammes 🤣😂

@SyrinSlava 4 жыл бұрын

For some reason I flinch every time he says it

@joefunnyguypesci6317 3 жыл бұрын

n u c l a y o t i d e

@KrystleOnline 3 жыл бұрын

😂

@nowhereman5119 6 жыл бұрын

First class explanation. The repetitive speech style of the author actually helps to reinforce the ideas.

@chinaibm 9 жыл бұрын

If it's not too much trouble, could you guys include the links of other videos you talk about in the video's descriptions? Thanks! love the vids

@AleksandrSharashkin 2 жыл бұрын

Thank you for explanation! Even I who had basic knowledge of biology and chemistry at school can easily understand 🙂 Thanks, you are my lifesaver

@Sakarq 9 жыл бұрын

Sal never disappoints!

@mmaking8664 8 жыл бұрын

+Sakarq NEVER

@miker7920 6 жыл бұрын

This is awesome, I learn more in one video than during a semester at school

@hipfire1920 3 жыл бұрын

You actually get to learn it several times because of his repetitive speech

@joyceong7221 6 жыл бұрын

KHAN"s helping me pass my uni courses.

@elektrofunkzz 7 жыл бұрын

POWERFUL SAL KHAN

@navinvenkat7551 5 жыл бұрын

Sir, You missed a Hydrogen atom at the 4' carbon atom Love your videos by the way Thanks a lot

@4tytude 2 жыл бұрын

Thanks Sal! I have been wondering too why does the DNA is drawn with the O in the phosphate group having a negative charge, while it's being called an acid. Took me a while to find any reference addressing this. Thanks for clearing that up!

@TomAustinIII 5 жыл бұрын

It would be great to have a similar breakdown on mitochondrial DNA.

@sulimand.qotiba4862 9 жыл бұрын

very helpful .. thank you

@adkatadkut422 6 жыл бұрын

deoxy, deoxy. ribonucleic, riiibo nucleic, riibo nucleic. acid. RIBONUCLEIC ACID. awesome vid btw

@rahulgattu825 7 жыл бұрын

The best! hats of SAL!

@kyleg4453 3 жыл бұрын

Always praying for you guys, God bless

@bearpickle 5 жыл бұрын

thanks for the great video- this really answered my question. now my mind is blown that this is actually going on at the base of our existence.

@daviddet 9 жыл бұрын

Whoa, I'm the first view on this video. Great video by the way! Love all your stuff!

@hipfire1920 3 жыл бұрын

does that mean you were first of like 300,000 students who were forced to watch this video?

@aliyadalo3812 7 жыл бұрын

Thanks a lot!

@CJ_Lucifer69 2 жыл бұрын

No mashed potatoes in this video sadly just sugar based particles

@eluneslightreachesitszenit2048 6 жыл бұрын

Thank ... Thank... you.. Thank you for the..... the ... vid... video.. the video.... thank you for the video... the video... thank you for the video. xD

@travischung2800 9 жыл бұрын

LIFE SAVERR

@christandme1372 6 ай бұрын

That was so beautiful💗

@Rocky-me5cw 5 жыл бұрын

Holy DNA!

@ghidaaskar1227 7 жыл бұрын

making life easier since i joined dentistry school. thank you!

@liyanasohairi5418 2 жыл бұрын

thank you khan academy

@zakirhossain9554 6 жыл бұрын

sal is resque thanks a lot

@bikidas5029 7 жыл бұрын

why purine and pyrimidine are numbered differently

@Walter5850 6 жыл бұрын

So why can't Cytosine for example pair with Adenine? It would make N - H - N , N - H - N hydrogen connections, and it's oxygen could just hog a little hydrogen to himself from somewhere just like what happens with thymine? I know sometimes the nitrogenous bases can connect weirdly when mutations happen, but I'm just wondering on a chemical scale, what would be the reason that this just doesn't happen all the time?

@sciencenerd7639 2 жыл бұрын

Very nice

@Horror528 9 ай бұрын

lmao if this is a high school chemistry in US it really changes my mind about y´alls education :DD

@rosepeterson3124 3 жыл бұрын

Where is the methyl group in thymine?

@imgamingbro2023 2 жыл бұрын

Who else is watching this for online classes during Covid-19

@KIM-ml8vs 6 жыл бұрын

thank you, but your repeating of words is really distracting

@jenniferross4234 5 жыл бұрын

Agreed, it's painful to listen to... one of the few reasons that I've avoided KA videos.

@hipfire1920 3 жыл бұрын

They do it so you will remember it better.

@jaimea.9742 2 жыл бұрын

@@jenniferross4234 yet you were here lol...find anyone else who explained it better?

@freshely9309 6 жыл бұрын

that hydrogen bond can sure get lost

@starwarfan8342 6 жыл бұрын

I still don't understand how hydrogen bonds can make proteins practically bulletproof when it's so easy to break hydrogen bonds.

@nimishajain5645 7 жыл бұрын

why is the other strand having a kind of inverted sugar

@alecbrady6901 7 жыл бұрын

DNA is made up of two antiparallel strands - they run parallel to each other but one is inverted or 'upside-down'. In Sal's depiction, the left strand is running 5' to 3' from top to bottom, and the right strand is the opposite to this and is running 3' to 5' from top to bottom. 5' and 3' just refer to the number carbon which is at the top and bottom of the chains. Hence, the other strand has an inverted sugar because it is upside down to the other strand. You can work out whether a strand is 5'->3' or 3'->5' by looking at the oxygen atom - the oxygen atoms always 'point' towards the 5' end of the strand.

@hamedhosseini4938 7 жыл бұрын

nerd

@alecbrady6901 7 жыл бұрын

That is the idea, considering the channel and all.

@nadilmallikaarachchige3853 4 жыл бұрын

wait so why cant thymine pair up with guanine, it looks like it can make a solid 2 bonds with guanine since the oxygen on guanine or the oxygen in thymine can bond with one of the middle hydrogens and the oxygen from thymine can pair with the hydrogen at the bottom of guanine, plus as proven at the end of the video where adenine and thymine have only 2 bonds to make a rung, so why cant thymine bond with guanine?

@minniekim2351 5 жыл бұрын

It s weird. It is repetitive sometime there s subtitles, other time there no subtitle on KZfaq. Does anyone know how to solve on the phone?

@hipfire1920 3 жыл бұрын

Non-autogenerated subtitles are put in manually by the creators or volunteers. Also, sometimes subtitles are turned off by the creator, if they choose.

@arocks1234567 4 жыл бұрын

Learn sugars Mem nitrogenous basis

@m.shazainrashid1806 4 жыл бұрын

A-One lecture.......

@SuperSmith 3 жыл бұрын

these videos would be half as long if they didn't color code every syllable.

@EvilScientist 3 жыл бұрын

370k views, and 45 comments... that's strange

@hipfire1920 3 жыл бұрын

It's all kids who were forced to watch the video but couldnt comment because they were blocked from doing so on their school email. Or they all watched it on Khan Academy's website, which doesnt give an option to comment

@yssa1945 3 жыл бұрын

if youre here bc of online classes say i

@cj-dy7zq Жыл бұрын

my brain isnt braining, sorry bye

@thepulsiphyer 22 күн бұрын

Bro! It's pronounced NOO-cle-oh-tide! Get it right... oh my gosh it's almost as bad as someone saying "nucular" instead of "nuclear". **facepalm** so annoying and distracting!