Part 07Structural forms of double helix of DNA

Описание: This video explains the different structural forms of DNA. The lecture focuses on A-DNA, B-DNA, and Z-DNA and how these forms differ in structure, shape, and biological role.
Topics covered in this video
• Introduction to structural forms of DNA. Why DNA can adopt different conformations under different conditions.
• B-DNA structure. The most common form of DNA in living cells. Right handed double helix. About 10 base pairs per turn. Major and minor grooves that help proteins recognize DNA.
• A-DNA structure. A more compact right handed helix. About 11 base pairs per turn. Bases are tilted relative to the helix axis. Usually forms under dehydrated conditions.
• Z-DNA structure. A left handed double helix. Zigzag arrangement of the sugar phosphate backbone. About 12 base pairs per turn. Occurs in sequences rich in GC bases and may play a role in gene regulation.
• Comparison of A-DNA, B-DNA, and Z-DNA. Differences in helix direction, base pairs per turn, diameter, and groove structure.
This lecture is helpful for MBBS, BDS, biotechnology, and biochemistry students who want to understand DNA conformations clearly for exams and conceptual learning.
Watch the full video to understand how DNA structure can change and why these structural variations are important in molecular biology.
#biochemistry
#mbbs
#mbbsfirstyear