Dr. Jennifer Louten PhD in Medical Sciences from Brown University, USA
I'm a professor who has taught college biology courses for years. This channel is a place for people to learn about the basic and more advanced biology principles encountered in college courses, particularly those that we don't have enough time to cover completely in class. These are also topics frequently encountered on standardized tests such as the MCAT, PCAT, or GRE Biology exam.
Interested in viruses? The second edition of my book is now available! Check it out at www.amazon.com/Essential-Human-Virology-Jennifer-Louten/dp/032390565X/
thank you <3 , I have a question...which will be an example of an emergent property of the biosphere? I was thinking about weather/climate, energy flow and cycling of matter while for ecosystem cycling of water
"5 prime" and "3 prime" indicate the ends of a strand of DNA. Check out this video for why we call the ends this: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-8l00SCMn2nM.htmlfeature=shared&t=145
It's actually thymine (T) that is replaced by uracil (U) in RNA. And that means that adenine (A) will base pair with uracil (U). Check out this video for more explanation of how DNA and RNA are made: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-ORPtbsJD6kU.htmlfeature=shared&t=236 (The RNA section starts at 8:21 into the video)
Such Clear and Life Saving Pointers in your Video Ma`am!! So, don't forget to read mRNA from 5' to 3' - It's what Ribosomes do!! Initially Ribosomes go 1 Nucleotide at a time, then they scan codon by codon (3 nucleotides at a time) -- Thank you so much Ma'am I really feel confident Thanks to your examples and hands on exercises Much Love from India & Cary North Carolina :) Please Please Please Keep Teaching
How do molecular machines like triple-A ATPases work? It is known that they do work upon the hydrolysis of ATP+H2O to ADP+Pi, but how is this converted into mechanical energy? And how comparable are these -30 kJ mol-1 compared to the constant random noise of the environment these molecular machines are in?
this is by far the most clear and concise explanation of the 2 processes. everyone just dips heavily into the theory and the t rna structure etc even in practice problems but nobody actually explains how the process takes place, what the technicalities are etc. thank you so much.
Hello professor your content is very wonderful and it helps me understand Bio much more do you mind making a video explaining Mitosis and the Meiosis phases that would be awesome
If you're talking about the translation of mRNA transcripts from eukaryotic genomic DNA, then the ribosome wouldn't be able to translate this into a protein without the AUG start codon. There are a few exceptions to this rule in prokaryotes and mitochondria, however. Otherwise, if this question appeared on a test about eukaryotic translation, it could be a trick question (no protein would be made) or it could just be an exercise to see if you can use the genetic code (but not necessarily how the ribosome would).
You have made things so clear in this video. I wonder if you have another video to clear up the confusion I have between DNA and chromosomes. DNA is supposed to be one continuous strand but chromosomes is chunks of that, right?
Great idea for a video! But yes, I think you understand the difference. In short, DNA is the substance while chromosomes are the compressed structures that DNA forms. In eukaryotic chromosomes, there are proteins (called histone proteins) that the DNA winds around that help to organize it into chromosomes. An analogy is with thread: thread is made of cotton or some material, but it's often wound around spools to organize it. So the thread is like the DNA -- the continuous strand -- while the plastic spool is like the histone proteins, and the spool + thread is like the chromosome. Humans have 46 total chromosomes so that means humans have 46 separate pieces of DNA that are organized into chromosomes (because the DNA isn't continuous from one chromosome to another).
