5•Msc botany third semester Question paper Series

••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...

Biological Databases – Types of Data and DatabasesNucleotide Sequence Databases (EMBL, GenBank, DDBJ)

Biological Databases – Types of Data and Databases Nucleotide Sequence Databases (EMBL, GenBank, DDBJ) 1. Introduction Biological databases are systematic, computerized collections of biological information that allow efficient storage, retrieval, updating, and analysis of large volumes of biological data. With the advent of genome sequencing, molecular biology, and bioinformatics, biological databases have become essential tools in biological research. These databases support studies in genomics, proteomics, evolutionary biology, taxonomy, medicine, agriculture, and biotechnology. 2. Types of Data Stored in Biological Databases Biological databases store diverse types of biological information, including: 1. Sequence Data DNA sequences RNA sequences Protein sequences 2. Structural Data Three-dimensional structures of proteins Nucleic acid structures 3. Functional Data Gene functions Enzyme activity Regulatory elements 4. Genomic Annotation Data Gene location Exons, introns Promoters a...

Gene Transfer Technologies – Detailed Notes

Gene Transfer Technologies – Detailed Notes 1. Definition Gene transfer is the process of introducing foreign DNA or genes into the genome of a target organism or cell. It allows the expression of new traits, study of gene function, and production of therapeutic proteins. Also known as gene delivery or genetic transformation. 2. Principles of Gene Transfer Involves delivery of DNA or RNA into cells or organisms. DNA can be integrated into the host genome or remain episomal (non-integrated). The goal is stable or transient expression of the transferred gene. Key considerations: Vector – vehicle for carrying the gene Target cell – plant, animal, microbial, or human cells Delivery method – physical, chemical, or biological 3. Types of Gene Transfer Gene transfer can be broadly classified into: A. Natural Gene Transfer Occurs in nature between organisms: Transformation: Uptake of naked DNA by bacteria. Transduction: DNA transfer via viruses (bacteriophages). Conjugation: Transfer of plasmi...

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...

Microbial Production of PharmaceuticalsSomatostatin, Humulin and Interferons

Microbial Production of Pharmaceuticals Somatostatin, Humulin and Interferons 1. Introduction Advances in recombinant DNA technology have enabled microorganisms to produce human therapeutic proteins safely, economically and in large quantities. Microbial systems such as Escherichia coli and yeast (Saccharomyces cerevisiae) are widely used for the production of pharmaceuticals that were earlier isolated from human or animal tissues. Important microbial-derived pharmaceuticals include somatostatin, human insulin (Humulin) and interferons. 2. Advantages of Microbial Production of Pharmaceuticals High yield and rapid production Cost-effective and scalable Free from animal pathogens Consistent product quality Easy genetic manipulation 3. General Steps in Microbial Production of Recombinant Pharmaceuticals Isolation of target gene Construction of recombinant DNA Insertion into suitable vector Transformation into host microorganism Expression of protein Downstream processing and purification ...

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...

RAPD (Random Amplified Polymorphic DNA)

RAPD (Random Amplified Polymorphic DNA) Introduction RAPD is a PCR-based molecular marker technique used to detect genetic variation at the DNA level. Developed by Williams et al., 1990. RAPD markers are dominant, randomly distributed, and do not require prior knowledge of DNA sequences. Commonly used in genetic diversity studies, plant breeding, population genetics, and phylogenetics. Principle RAPD relies on the amplification of random DNA segments using short arbitrary primers (usually 10 nucleotides). Polymorphism occurs due to: Presence or absence of primer binding sites Insertions or deletions in the DNA Point mutations in the primer sites Key idea : Random primers anneal to complementary sites → PCR amplification → Different band patterns between individuals → Polymorphism analysis Materials Required Genomic DNA Arbitrary oligonucleotide primers (10-mer) PCR reagents: Taq polymerase, dNTPs, buffer, Mg²⁺ Thermal cycler Agarose gel and electrophoresis equipment DNA staining dyes (...

GEL RETARDATION ANALYSIS

GEL RETARDATION ANALYSIS (EMSA – Electrophoretic Mobility Shift Assay) Introduction Gel retardation analysis, also known as Electrophoretic Mobility Shift Assay (EMSA), is a widely used in vitro technique for studying DNA–protein and RNA–protein interactions. The method is based on the observation that a DNA–protein complex migrates more slowly than free DNA during non-denaturing gel electrophoresis, resulting in a mobility shift or “retardation”. EMSA is extensively used to study transcription factor binding, regulatory DNA elements, and binding specificity. Definition Gel retardation analysis (EMSA) is a technique used to detect and analyze binding interactions between nucleic acids and proteins by observing the reduced electrophoretic mobility of nucleic acid–protein complexes compared to free nucleic acids. Principle A labeled DNA or RNA probe is incubated with a specific binding protein. When binding occurs, a nucleic acid–protein complex is formed. This complex has a larger size ...

Single Nucleotide Polymorphisms (SNPs) – Detailed Notes

Single Nucleotide Polymorphisms (SNPs) – Detailed Notes 1. Definition SNPs are single base-pair variations in the DNA sequence that occur at a specific position in the genome among individuals of a species. Example: At a specific locus, one individual may have A while another has G: Copy code Individual 1: …A T C G A T… Individual 2: …A T C G G T… SNPs are the most common type of genetic variation in most organisms. 2. Characteristics of SNPs Single base change: Involves substitution of one nucleotide for another (A↔G, C↔T). Biallelic nature: Most SNPs have only two alleles in a population. Widespread in the genome: Found in coding regions (exons), non-coding regions (introns, promoters, intergenic regions). Stable inheritance: Passed from generation to generation like other genetic markers. Frequency: Occur approximately every 100–300 bp in the human genome. 3 . Types of SNPs SNPs are categorized based on location or effect on gene function: A. Based on genomic location Cod...

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 )

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