5•Msc botany third semester Question paper Series

Protein Structure Database (PDB)

Protein Structure Database (PDB) Introduction The Protein Structure Database (PDB) is the primary global repository for the three-dimensional (3D) structures of biological macromolecules such as proteins, nucleic acids, and protein–ligand complexes. These structures are determined experimentally using techniques like X-ray crystallography, Nuclear Magnetic Resonance (NMR) spectroscopy, and Cryo-Electron Microscopy (Cryo-EM). PDB plays a vital role in understanding: Protein structure and function Molecular interactions Drug discovery and design Structural biology and bioinformatics History and Development Established in 1971 Founded by Brookhaven National Laboratory (USA) Initially contained only 7 protein structures Now maintained by the Worldwide Protein Data Bank (wwPDB) Members of wwPDB RCSB PDB (USA) PDBe (Europe) PDBj (Japan) BMRB (Biological Magnetic Resonance Data Bank) Objectives of PDB To collect, store, and distribute 3D structural data of biomolecules To provide free and ope...

❥ Southern Blotting Notes

Southern Blotting ❥ 𓆞❥ 𓆞❥ 𓆞❥ 𓆞❥ 𓆞❥ 𓆞❥ 𓆞❥ 𓆞❥ 𓆞❥ Introduction Southern blotting is a molecular biology technique used for the detection of specific DNA sequences in a complex mixture of DNA. It was developed by Edwin M. Southern in 1975. The method involves restriction digestion of DNA, separation by gel electrophoresis, transfer (blotting) onto a membrane, and hybridization with a labeled DNA probe. Principle of Southern Blotting The technique is based on the principle of complementary base pairing. A single-stranded labeled DNA probe hybridizes specifically with its complementary DNA sequence immobilized on a membrane. Detection of the label confirms the presence and size of the target DNA fragment. Steps Involved in Southern Blotting. 1. Isolation of DNA Genomic DNA is extracted from cells or tissues. DNA must be pure and intact to ensure accurate results. 2. Restriction Enzyme Digestion DNA is digested using specific restriction endonucleases. Produces DNA f...

𓆞 Western Blotting Notes

Western Blotting (Immunoblotting) ❥ 𓆞❥ 𓆞❥ 𓆞❥ 𓆞❥ 𓆞❥ 𓆞❥ 𓆞❥ 𓆞❥ 𓆞❥ Introduction Western blotting, also known as immunoblotting, is a widely used analytical technique for the detection, identification, and quantification of specific proteins in a complex biological sample. The technique combines protein separation by gel electrophoresis with specific antigen–antibody interaction. The method was developed by Towbin et al. (1979) (Burnette 1981---its group work) and is called “Western” in analogy to Southern blotting (DNA) and Northern blotting (RNA). Principle The principle of Western blotting involves: Separation of proteins based on molecular weight using SDS-PAGE Transfer (blotting) of separated proteins onto a membrane Specific detection of the target protein using primary and secondary antibodies Visualization using enzymatic or fluorescent detection systems 👉 Antigen–antibody specificity is the core principle of Western blotting. Steps Involved in Western Blotting 1. Sa...

✩‧₊ Plaque Blotting Technique

Plaque Blotting Technique *ੈ✩‧₊˚༺☆༻*ੈ✩‧₊˚*ੈ✩‧₊˚༺☆༻*ੈ✩‧₊˚ Introduction Plaque blotting is a molecular biology screening technique used to identify specific DNA or RNA sequences present in bacteriophage plaques formed on a bacterial lawn. It is especially useful in the screening of recombinant phage libraries such as λ (lambda) phage genomic or cDNA libraries. This technique combines: Plaque assay (to isolate individual phage clones) Blotting technique (to transfer nucleic acids onto a membrane) Hybridization (to detect specific sequences using labeled probes) Principle of Plaque Blotting The principle of plaque blotting is based on nucleic acid hybridization. Each plaque represents a clone of phage particles containing identical DNA. DNA from phage particles in plaques is: Released Denatured into single strands Transferred onto a nitrocellulose or nylon membrane The membrane is incubated with a labeled DNA/RNA probe complementary to the target sequence. Hybridization between probe and t...

DNA FOOTPRINTING

DNA FOOTPRINTING Introduction DNA footprinting is a molecular biology technique used to identify the specific site(s) on DNA where proteins (such as transcription factors) bind. It reveals the exact nucleotide sequences protected by bound proteins against cleavage by nucleases or chemical agents. It is widely used to study DNA-protein interactions, transcription regulation, and gene expression control. Definition DNA footprinting: A technique used to locate the binding site of DNA-binding proteins on DNA by detecting protected regions that are resistant to enzymatic or chemical cleavage. Principle DNA-binding proteins protect the DNA segment they occupy. DNA exposed to nucleases (DNase I) or chemical cleavage agents is cut at accessible regions. Regions bound by protein remain unaffected, leaving a “footprint”. When fragments are separated on a denaturing polyacrylamide gel, the missing bands correspond to protein-binding sites. Key idea: Cleavage occurs everywhere except where the pro...

RESTRICTION MAPPING

RESTRICTION MAPPING Introduction Restriction mapping is a molecular biology technique used to determine the relative positions of restriction enzyme recognition sites on a DNA molecule. It involves digestion of DNA with one or more restriction endonucleases followed by analysis of fragment sizes using agarose gel electrophoresis. Restriction mapping is essential for DNA characterization, cloning strategies, gene localization, and genome analysis. Definition Restriction mapping is the process of identifying the number, order, and distances between restriction enzyme cleavage sites within a DNA fragment by analyzing the pattern of fragments generated after enzymatic digestion. Principle Restriction enzymes cut DNA at specific palindromic nucleotide sequences. When DNA is digested with: Single restriction enzyme → produces fragments based on its recognition sites Multiple restriction enzymes → produces fragments whose sizes reveal the relative positions of sites By comparing fragment size...

••CLASSIFICATION OF ALGAE - FRITSCH

MODULE -1 PHYCOLOGY CLASSIFICATION OF ALGAE - FRITSCH ❖F.E. Fritsch (1935, 1945) in his book“The Structure and Reproduction of the Algae”proposed a system of classification of algae. He treated algae giving rank of division and divided it into 11 classes. His classification of algae is mainly based upon characters of pigments, flagella and reserve food material. Classification of Fritsch was based on the following criteria o Pigmentation. o Types of flagella o Assimilatory products o Thallus structure o Method of reproduction Fritsch divided algae into the following 11 classes 1. Chlorophyceae 2. Xanthophyceae 3. Chrysophyceae 4. Bacillariophyceae 5. Cryptophyceae 6. Dinophyceae 7. Chloromonadineae 8. Euglenineae 9. Phaeophyceae 10. Rhodophyceae 11. Myxophyce...

𓆉 INDEX PAGE -NOTETHEPOINT43

INDEX PAGE MAIN CONTENT 1. HSST BOTANY SYLLABUS, DETAILED NOTES, MCQ 2. SET GENERAL PAPER SYLLABUS, DETAILED NOTES, 50MCQ 3. SET BOTANY SYLLABUS, DETAILED NOTES, MCQ 4. MSC BOTANY THIRD SEMESTER SYLLABUS, NOTES (KERALA UNIVERSITY ) 5. MSC BOTANY THIRD SEMESTER QUESTION PAPER (KERALA UNIVERSITY ) 6. MSC BOTANY FOURTH SEMESTER SYLLABUS &NOTES (KERALA UNIVERSITY ) 7. FOURTH SEMESTER MSC BOTANY PREVIOUS QUESTION PAPER (KERALA UNIVERSITY )

Notethepoint 43official Previous Question Paper Updates2.0

Search This Blog