- Видео 14
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ChemBio
Великобритания
Добавлен 21 дек 2020
Welcome to ChemBio! On this channel, you can find many videos about specific topics in Chemistry, Biology and Biochemistry. Some videos are specific to the A level courses, and we do have special revision videos as well. Our channel also has translations of interesting documentaries from other languages into English. We hope you enjoy learning about this truly fascinating field of science! You are always more than welcome to ask questions by emailing us at himbio.tv.i@gmail.com or writing a comment below one of the videos. Good luck!
Biodiversity - OCR (A) A Level Biology | Whole Topic Revision
In this revision video, we'll be covering the whole topic of Biodiversity for the OCR (A) A level Biology specification. The specification reference is 4.2.1. We'll look at how biodiversity can be considered at the genetic, species and habitat level; how to calculate genetic biodiversity and species biodiversity (using Simpson's Index); the practical skills required for this topic, i.e. sampling plants (quadrats, transects), sampling animals and estimating population sizes (i.e. Lincoln's index and the Petersen capture-release-recapture method); the factors affecting biodiversity (deforestation, agriculture and climate change); the aesthetic, economic and ecological reasons for maintainin...
Просмотров: 4 133
Видео
The Mechanism of Buffer Solutions Clearly Explained
Просмотров 1,4 тыс.2 года назад
This video looks at the principle of buffer solutions - solutions that minimise changes in pH upon the addition of small amounts of acid or base. An example of a buffer solution can be found in the blood. It is really important to keep the pH of the blood constant (for homeostasis), so there has to be a buffer system to ensure this. We will look at how this works using Le Chatelier's principle....
The Structure of Benzene (Translation into English)
Просмотров 982 года назад
This is a translation into English of a short educational clip about the chemical structure of a molecule of benzene. The original source is from the Ministry of Education of the RSFSR (part of the Soviet Union).
Monosaccharides (Translation into English)
Просмотров 1033 года назад
Monosaccharides are carbohydrates - the most abundant group of organic molecules on Earth. In this documentary, the chemical properties of monosaccharides (glucose, galactose) are discussed, such as stereoisomerism, tautomerisation and reactions of oxidation and reduction. This is the English translation of the original documentary by Lennauchfilm (Леннаучфильм). All questions and appropriate c...
Disease and Immunity WHOLE TOPIC REVISION - A level (AS) Biology | OCR, AQA, Edexcel
Просмотров 1,6 тыс.3 года назад
The whole chapter of communicable disease and immunity will be covered in this video. The topics included are: -types of pathogens (bacteria, fungi, viruses, protoctista/protists) and their modes of action; -named examples of plant and animal diseases (ring rot, tobacco mosaic virus, blight, black sigatoka, tuberculosis, meningitis, HIV/AIDS, influenza, malaria, ring worm and athlete's foot); -...
Homologous chromosomes, sister chromatids, bivalents etc. explained
Просмотров 41 тыс.3 года назад
What's the difference between a pair of homologous chromosomes and sister chromatids? What is chromatin and what is a chromosome? The answers to these questions is in this video. ONE-TO-ONE AND GROUP TUTORING: If you are interested in tutoring sessions, individually or in groups, please contact us at himbio.tv.i@gmail.com for more details. All questions and appropriate comments are welcomed.
Intermolecular forces - A level Chemistry Revision | OCR, AQA, Edexcel
Просмотров 8753 года назад
Intermolecular forces, i.e London forces (induced dipole-dipole interactions), permanent dipole-dipole interactions and hydrogen bonding will be revised in this video. All questions and appropriate comments are welcomed.
Enzymes - mechanism of action and factors affecting enzyme activity | A level Biology revision
Просмотров 2803 года назад
The mechanism of action of enzymes and factors affecting their activity will be revised in this video. This includes the "lock and key" mechanism, the "induced fit hypothesis", Q10 calculations, and the idea of V max. All questions and appropriate comments are welcomed.
Electronegativity and polarity - A level Chemistry Revision (whole topic) | OCR, AQA, Edexcel
Просмотров 5363 года назад
The topics of electronegativity and polarity will be thoroughly revised in this video. This includes polar and non-polar bonds, how the geometry of a molecule determines its polarity, along with some examples and exam question advice. All questions and appropriate comments are welcomed.
Shapes of molecules and VSEPR theory (part 2) - A level Chemistry Revision | OCR, AQA, Edexcel
Просмотров 1243 года назад
This is part 2 of the video on the shapes (geometry) of molecules, where all the specific shapes with their names and bond angles are discussed. All questions and appropriate comments are welcomed.
Protein Synthesis (transcription; translation) - A level Biology Revision | OCR, AQA, Edexcel
Просмотров 3713 года назад
This video explains the process of protein synthesis (transcription and translation) with a few animations, as well as the key terminology for this part of the topic. All questions and appropriate comments are welcomed.
DNA Replication - A level Biology Revision
Просмотров 6103 года назад
This lesson covers the process of semi-conservative DNA replication that is required for the OCR, AQA, Edexcel etc. AS and A-level exams. We'll discuss the key enzymes involved, all the stages, and how to answer exam questions. All questions and appropriate comments are welcomed.
Nucleic acids - A level Biology Revision
Просмотров 8303 года назад
Nucleic acids is section 2. 3. 8 by the OCR specification, and looks at the structures of the nucleic acids DNA and RNA. Culture TV: ruclips.net/channel/UCS8gDQ6F3tckkIKYUszQK9A All questions and appropriate comments are welcomed.
Shapes of molecules (VSEPR theory) | A level Chemistry Revision (Part 1)
Просмотров 1473 года назад
Welcome to ChemBio! This is the affiliate of Culture TV (Kultura TV) that focuses on revision and lessons for A level Biology and Chemistry. The previous video referred to at the start of the video is over on Culture TV, here is the link: ruclips.net/channel/UC-i6YSxYh_MVSn1almG6Yig?view_as=subscriber This video explains the theory behind the geometry (shapes) of molecules. All questions and ap...
Thank you sooo much you are saving my grades 😔
I think theres a mistake. At 11:53 you’re saying after replication there are 92 chromosomes, this isn’t right. There are still 46 chromosomes.
Thank you so much ... Hats off to your work...the concept is crystal clear to me now 💙
Thank you so much for this video. You just explained clearly what I spent one hour searching for.
Beutiful ❤
I wounldnt say the homologous chromosomes are identical but are similar
I can't even begin to describe HOW HELPFUL this was none of the videos or teachers have been able to clear my confusion about chromosomes, chromatids, sister chromatids, homologous chromosomes. I immediately subscribed and liked. Thank you !!
IDK WHY, but when i read this EVERYTHING CLICKED in my mind. So thank u!!
Perfect explanation. This subtle nuance in terminology is always glossed over and has been a source of confusion for years. 👏👏
Thank you for clearing all my doubts!
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11:35 actually, you still have 46 "chromosomes" but each sister chromatid has a twin = 92 "chromatids". Typically, chromosomes are counted by the number of centromeres and this stays constant upon DNA replication in S phase. After replication, the diploid cell can be said to have 46 "double-stranded" chromosomes.
Thank youuuuuu sir Very much ❤ It saved me truly Such a great explanation I havent hot such a nice video explanation of this topic from anywhere 👏👏👏👏👏👏👏👏👏👏👏👏👏👏👏👏👏👏👏
Learned all this in 13-mins in Grad school. Concepts I have been going over since UG 😆
this video literally saved me I was struggling to grasp the idea of diploid and haploid and the difference between the duplicated chromatids and normal chromatids. Thanks to this video ITS SO CLEAR! THANK YOU SO SO MUCH
From a somehow very confused biomed uni student thank you so much, I've always struggled completely wrapping my mind around the terms but you've explained it perfectly. And thank you for calling out the confusing terms used 😂
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Thank you so much!! I've been agonising on how to draw the difference of chromosomes and chromatids 😭 now I know that tge X shape is still considered to be 1 chromosome. 8th grade science is confusing..🥲 Ty for explaining it well!!! :))
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THANK YOU, best video explaining each term🙏
You saved my life with this video, I was so confused but now I know the difference of everything. Thanks a lot!
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Thank you
Fantastic explanation and video. I have learnt so much by watching this and listening to you thank you. I've subscribed.
Thank you so so much for this video! explained so well and effectively !!
Amazing video. helped me a lot for tomorrow's exam!
Amazing 👌🏻❤️
THIS IS SO GOOOOD THANK YOU SO MUCH
I have a question. I understood that after duplication 1 chromatid and 1 chromosome becomes 2 chromatid and 1 chromosome. In the video in prophase you say there are 92 chromosomes and 92 chromatids. Shouldn't it be 92 chromatids AND 46 chromosomes? I did not quite understand this so I could be wrong.
yes there should be correction. 23 pair, 46 chromosome & 92 chromatid.
I cannot begin to describe how awesome that homologous explanation was.
Can’t thank you enough!! Felt like I couldn’t grasp the concept with all the terms, but now I fully understand the terms to be able to grasp the concept. Great video! 🎉
Thank u very much sir😊
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Your videos are so helpful! Please continue making them ❤
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Very nice explanation. This channel deserves many more subscriptions & likes. Good luck! Would love to see more of the videos you have made & will make!
Thank you very much!
I counted,,,,,,,
Lifesaver ... literally!!!!!
This was so helpful!! Love the pasta analogy
Okay..might be stupid qsn but....sister chromatids are the replicated chromosome that is attached at the centromere and are genetically same but homologous chromosomes are a pair of chromosomes...(where 1 chromosome is maternal and has 2 sister chromatids and the other is paternal and also has 2 sister chromatids)..and homologous chromosomes have same set of genes but are not entirely genetically similar?)
Yes, this is all absolutely correct, except that homologous chromosomes don't necessarily have to be duplicated (i.e., contain two sister chromatids) - two single, non-duplicated chromosomes can still be called homologous.
@11:41 YOU ARE INCORRECT DNA REPLICATION TAKES PLACE IN S PHASE AFTER G1 CHROMOSOME NUMBER DOES NOT INCREASE BRO