i just started med school and i was stressed that i didn't understand the lecture. after watching your video it's all clear now haha you are teaching like we're stupid and i love that. Thank you sooo muchhh lots of love from Turkey ❤️
When I was in the phase of learning and promoted to next semester, I didnt remember anything from previous semester 🙃 so thats why I try to make video from basic concept 😅. Thank you so much for your comment 💗 💖 💜 💕.
thank you sooo much. your explanation is very beautiful, iam Islam from egypt and iam a microbiology student. really this video has provided me with good information.
00:00 Structural forms of DNA are diverse 00:57 DNA has three common forms: A, B, and Z. 01:51 Ideal environment for DNA in the cell 02:52 DNA structure has two grooves: major and minor 03:44 Form A adapts to dehydrating environments 04:40 Form A and Z have different groove structures 05:36 DNA can exist in two forms: B form and Z form 06:30 The C form has a smaller diameter than the B form Crafted by Merlin AI.
Thank you ma'am for this video. A question please. Can you only determine a turn by the number of base pairs?? That is when ever I count 10 base pairs I have 1 turn??
Hi Kyraah The variation of energy with the twist of the base pairs about the helix axis shows the straight DNA free in solution is most stable with about 10 1/2 base pairs per turn rather than 10 as observed in the solid state, whereas superhelical DNA in chromatin is most stable with about 10 base pairs per turn. This result, which has a simple physical interpretation, explains the pattern of nuclease cuts and the linkage number changes observed for DNA arranged in chromatin. The Reference Site for this statement is pubmed.ncbi.nlm.nih.gov/273227/ Thank You
Hi Asmaa, With the line of sight along the helix's axis, if a clockwise screwing motion moves the helix away from the observer, then it is called a right-handed helix. In B form of DNA, experiment proved the principle underlying the Vester-Ulbricht hypothesis that the primarily left-handed spinning electrons in cosmic rays could have preferentially destroyed left-handed precursors of DNA, leaving only right-handed DNA. For more details you can take help from this article www.sciencedirect.com/topics/chemistry/right-handed-helix
