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Ribosomal Subunit Weights (Prokaryotes and Eukaryotes) + Svedbergs | MCAT

TL;DR: the ribosomal subunit weights for prokaryotes are 30S and 50S, while the whole ribosome is 70S. The corresponding ribosomal subunit weights for eukaryotes are 40S, 60S, and 80S. Prokaryotes: 30S, 50S, 70S (Mnemonic: Prokaryotes are Prime OR prokaryotes are odd) Eukaryotes: 40S, 60S, 80S (Mnemonic: Eukaryotes are Even) Today’s MedCat video covers ribosomal subunit weights, which are measured in Svedbergs, a unit used for assessing the sedimentation coefficient of anything we are looking at, whether that is an individual molecule, protein, or even a ribosomal subunit! In general, the larger the molecule, the larger the sedimentation coefficient. We go over prokaryotic ribosomes as well as eukaryotic ribosomes. Eukaryotic ribosomes are slightly larger than prokaryotic ribosomes, which should make sense as eukaryotes are, in general, much larger than prokaryotes (e.g. humans are much bigger than bacteria!). Both prokaryotic and eukaryotic ribosomes have small and large subunits. These subunit “weights,” measured in Svedbergs, are not additive due to the fact that sedimentation coefficients are not additive, as other factors besides the mass/weight affect sedimentation coefficient, such as shape and density of whatever we are examining. For more information on Svedbergs, check out the Wikipedia article linked below: What is a Svedberg?: https://bit.ly/3gllSmM What is a sedimentation coefficient?: https://bit.ly/2TTtHIL Time Stamps: Intro: (0:00) Ribosomal Subunits and Svedbergs: (0:08) Outro: (4:26) Comprehensive Amino Acid Playlist: https://bit.ly/3sMGBUG Check out Aratasaki, the beat maker behind my intro and outro: https://bit.ly/2Pma5v0 ____________________________________________________________________________ All content and media on this channel is created and published online for informational purposes only. It is not intended to be a substitute for professional medical advice and should not be relied on as health or personal advice. ____________________________________________________________________________ "Copyright Disclaimer, Under Section 107 of the Copyright Act 1976, allowance is made for 'fair use' for purposes such as criticism, comment, news reporting, teaching, scholarship, and research. Fair use is a use permitted by copyright statute that might otherwise be infringing. Non-profit, educational or personal use tips the balance in favor of fair use." —————————————————————————————————————————— #mcat #svedberg Ribosomal Subunit Weights (Prokaryotes and Eukaryotes) + Svedbergs | MCAT Ribosomal Subunit Weights (Prokaryotes and Eukaryotes) + Svedbergs | MCAT Ribosomal Subunit Weights (Prokaryotes and Eukaryotes) + Svedbergs | MCAT AAMC FL #4 (Full Length) B/B (Bio/Biochem) #19 (problem) AAMC FL #4 (Full Length) B/B (Bio/Biochem) #19 (problem) AAMC FL #4 (Full Length) B/B (Bio/Biochem) #19 (problem)