Molecular structure of DNA | Macromolecules | Biology | Khan Academy

Подписаться 8 млн

Просмотров 452 тыс.

50% 1

Courses on Khan Academy are always 100% free. Start practicing-and saving your progress-now: www.khanacademy.org/science/a...
Molecular structure of DNA. Nucleotide. Nitrogenous base, phosphate.
Biology on Khan Academy: Life is beautiful! From atoms to cells, from genes to proteins, from populations to ecosystems, biology is the study of the fascinating and intricate systems that make life possible. Dive in to learn more about the many branches of biology and why they are exciting and important. Covers topics seen in a high school or first-year college biology course.
About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. We've also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content.
For free. For everyone. Forever. #YouCanLearnAnything
Subscribe to Khan Academy's Biology channel: / channel
Subscribe to Khan Academy: ru-vid.com_...

Опубликовано:

14 июл 2015

Ссылка:

Скачать:

Готовим ссылку...

Добавить в:

Мой плейлист

Посмотреть позже

Комментарии : 64

@jeromekrammes2031 6 лет назад

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

@yourfavouritescepticx8969 4 года назад

Jerome Krammes 🤣😂

@SyrinSlava 4 года назад

For some reason I flinch every time he says it

@joefunnyguypesci6317 3 года назад

n u c l a y o t i d e

@KrystleOnline 3 года назад

😂

@nowhereman5119 6 лет назад

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

@Sakarq 9 лет назад

Sal never disappoints!

@mmaking8664 8 лет назад

+Sakarq NEVER

@chinaibm 9 лет назад

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 года назад

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

@miker7920 6 лет назад

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

@hipfire1920 3 года назад

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

@elektrofunkzz 7 лет назад

POWERFUL SAL KHAN

@joyceong7221 6 лет назад

KHAN"s helping me pass my uni courses.

@navinvenkat7551 5 лет назад

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

@4tytude 2 года назад

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 лет назад

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

@sulimand.qotiba4862 9 лет назад

very helpful .. thank you

@adkatadkut422 6 лет назад

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

@rahulgattu825 7 лет назад

The best! hats of SAL!

@bearpickle 5 лет назад

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.

@kyleg4453 3 года назад

Always praying for you guys, God bless

@CJ_Lucifer69 2 года назад

No mashed potatoes in this video sadly just sugar based particles

@aliyadalo3812 7 лет назад

Thanks a lot!

@travischung2800 9 лет назад

LIFE SAVERR

@daviddet 9 лет назад

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

@hipfire1920 3 года назад

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

@christandme1372 6 месяцев назад

That was so beautiful💗

@Rocky-me5cw 6 лет назад

Holy DNA!

@zakirhossain9554 6 лет назад

sal is resque thanks a lot

@liyanasohairi5418 2 года назад

thank you khan academy

@eluneslightreachesitszenit2048 6 лет назад

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

@bikidas5029 7 лет назад

why purine and pyrimidine are numbered differently

@sciencenerd7639 2 года назад

Very nice

@Walter5850 6 лет назад

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?

@ghidaaskar1227 7 лет назад

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

@m.shazainrashid1806 4 года назад

A-One lecture.......

@gamingbrotv 2 года назад

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

@Horror528 9 месяцев назад

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

@rosepeterson3124 3 года назад

Where is the methyl group in thymine?

@arocks1234567 4 года назад

Learn sugars Mem nitrogenous basis

@nadilmallikaarachchige3853 4 года назад

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?

@KIM-ml8vs 6 лет назад

thank you, but your repeating of words is really distracting

@jenniferross4234 5 лет назад

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

@hipfire1920 3 года назад

They do it so you will remember it better.

@jaimea.9742 2 года назад

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

@freshely9309 7 лет назад

that hydrogen bond can sure get lost

@starwarfan8342 6 лет назад

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

@nimishajain5645 7 лет назад

why is the other strand having a kind of inverted sugar

@alecbrady6901 7 лет назад

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 лет назад

nerd

@alecbrady6901 7 лет назад

That is the idea, considering the channel and all.

@minniekim2351 5 лет назад

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

@hipfire1920 3 года назад

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

@EvilScientist 3 года назад

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

@hipfire1920 3 года назад

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

@SuperSmith 3 года назад

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

@yssa1945 3 года назад

if youre here bc of online classes say i

@cj-dy7zq Год назад

my brain isnt braining, sorry bye

@thepulsiphyer Месяц назад

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!