7.FOURTH SEMESTER MSC BOTANY QUESTION PAPER (KERALA UNIVERSITY )

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...

••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...

Agrobacterium & CaMV-Mediated Gene Transfer –

Agrobacterium and CaMV-Mediated Gene Transfer – Detailed Notes 1. Introduction Gene transfer in plants is often achieved by exploiting natural genetic mechanisms of Agrobacterium tumefaciens and Cauliflower Mosaic Virus (CaMV). These systems allow stable introduction of foreign genes into plant genomes for transgenic plant development. 2. Agrobacterium-Mediated Gene Transfer 2.1 Definition Agrobacterium-mediated gene transfer uses the natural ability of Agrobacterium tumefaciens, a soil bacterium, to transfer a part of its DNA (T-DNA) into plant cells. T-DNA integrates into the plant nuclear genome, enabling stable transformation. 2.2 Mechanism Recognition and attachment Agrobacterium detects phenolic compounds secreted by wounded plant cells. These compounds activate virulence (vir) genes on the Ti (tumor-inducing) plasmid. Activation of vir genes VirA (sensor kinase) and VirG (response regulator) induce expression of other vir genes (VirB, VirC, VirD, VirE). T-DNA processing and tran...

Mapping of DNA

DNA MAPPING 1. Introduction DNA mapping refers to the process of determining the relative positions of genes or DNA sequences on a chromosome. It provides information about the organization, structure, and distance between genetic markers in a genome. DNA mapping is an essential step toward genome sequencing, gene identification, disease diagnosis, and genetic engineering. DNA maps serve as roadmaps that guide researchers to locate specific genes associated with traits or diseases. 2. Objectives of DNA Mapping To locate genes on chromosomes To determine the order of genes To estimate distances between genes or markers To study genome organization To assist in genome sequencing projects. 3. Principles of DNA Mapping DNA mapping is based on: Recombination frequency Physical distance between DNA fragments Hybridization of complementary DNA Restriction enzyme digestion Use of genetic markers The closer two genes are, the less frequently they recombine during meiosis. 4 . Types of DNA...

❃HPLC – High Performance Liquid Chromatography

HPLC – High Performance Liquid Chromatography ┏━━━━━ •❃°•°❀°•°❃•━━━━•━━━┓ 1. Introduction High Performance Liquid Chromatography (HPLC) is an advanced analytical technique used for the separation, identification, and quantification of components present in a mixture. It is based on the differential distribution of analytes between a stationary phase and a liquid mobile phase under high pressure. HPLC is widely used in biochemistry, biotechnology, pharmaceuticals, food analysis, environmental studies, and clinical diagnostics. 2. Principle of HPLC The principle of HPLC is based on partition, adsorption, ion-exchange, or size-exclusion mechanisms, depending on the type of column used. A liquid mobile phase is pumped at high pressure through a column packed with fine stationary phase particles Sample components interact differently with the stationary phase Components with stronger interaction elute slower Components with weaker interaction elute faster Separated components are detec...

❃HPTLC (HIGH PERFORMANCE THIN LAYER CHROMATOGRAPHY) DETAILED NOTES

HPTLC (HIGH PERFORMANCE THIN LAYER CHROMATOGRAPHY) DETAILED NOTES ┏━━━━━ •❃°•°❀°•°❃•━━━━•━━━┓ 1. INTRODUCTION HPTLC is an advanced form of Thin Layer Chromatography (TLC) that allows high-resolution separation and quantitative analysis of chemical compounds. It combines classical TLC principles with automation, precise sample application, and densitometric detection. HPTLC is widely used in pharmaceuticals, herbal medicine, food analysis, and chemical research. Compared to TLC, HPTLC offers: Better resolution Higher sensitivity Quantitative capabilities Example: Fingerprinting of plant extracts, identification of drugs in mixtures, detection of contaminants in food. 2. PRINCIPLE HPTLC separates compounds based on differential migration on a stationary phase under the influence of a mobile phase. Principle: Adsorption chromatography Compounds interact with the stationary phase (silica gel, alumina, or cellulose) differently depending on polarity, molecular size, or functional groups. Mo...

Suspension culture and development - methodology, kinetics of growth and production formation, elicitation methods, hairy root culture. Detailed notes

Suspension culture and development - methodology, kinetics of growth and production formation, elicitation methods, hairy root culture. Detailed notes 1. Introduction Suspension culture is a type of plant tissue culture in which single cells or small cell aggregates are grown in liquid nutrient medium under continuous agitation. It is mainly used for: Large-scale biomass production Secondary metabolite production Cell physiology and biochemical studies Genetic manipulation and selection. 2. Methodology of Suspension Culture 2.1 Source of Explant Usually initiated from friable callus Callus derived from: Leaf Stem Root Hypocotyl Friable callus is preferred as it disintegrates easily into single cells. 2.2 Preparation of Cell Suspension Friable callus is transferred into liquid MS medium Medium contains: Carbon source (usually sucrose) Auxins (2,4-D commonly used) Culture maintained in: Conical flasks Orbital shaker (100–150 rpm) 2.3 Culture Conditions Parameter Requirement Temperature ...

Electroporation – Detailed Notes

Electroporation – Detailed Notes Definition : Electroporation is a physical method of gene transfer in which cells are exposed to a brief, high-voltage electric pulse, creating temporary pores in the cell membrane. This allows DNA, RNA, proteins, or other molecules to enter the cytoplasm. It is widely used in bacteria, yeast, plant protoplasts, and mammalian cells. Key Concept: The electric field destabilizes the membrane, making it permeable to macromolecules. 1. Principle Cells are suspended in a conductive medium. A brief electrical pulse induces transient pores in the plasma membrane. DNA or other molecules present in the medium enter the cell through these pores. Membrane reseals after the pulse, and the molecule is retained inside the cell. Advantages of Principle: Direct and rapid. Works in many cell types. Does not require chemical carriers or viral vectors. 2. Materials Required Cells – bacterial, yeast, plant protoplasts, mammalian cells. DNA/RNA/other macromolecule – purifie...

Notethepoint 43official Previous Question Paper Updates2.0

Search This Blog