5•Msc botany third semester Question paper Series

RFLP (Restriction Fragment Length Polymorphism)

RFLP (Restriction Fragment Length Polymorphism ) Introduction RFLP is one of the earliest DNA-based molecular marker techniques. It detects variation in DNA sequences between individuals, caused by mutations, insertions, deletions, or restriction enzyme recognition site changes. First developed in late 1970s–1980s. Used extensively in genetic mapping, DNA fingerprinting, and gene detection. It is co-dominant, locus-specific, and highly reproducible. Principle RFLP is based on the fact that DNA from different individuals may differ in the presence or absence of restriction enzyme recognition sites, leading to different fragment sizes after digestion. Key idea: DNA → Restriction enzyme digestion → Fragments → Gel separation → Detection using labeled probe → Polymorphism analysis Materials Required Genomic DNA from the organism Restriction enzymes (e.g., EcoRI, HindIII) Agarose or polyacrylamide gel Nylon or nitrocellulose membrane Radioactive or non-radioactive DNA probe Autoradiography ...

Protein Sequence DatabasesPIR, SWISS-PROT and TREMBEL

Protein Sequence Databases PIR, SWISS-PROT and TREMBEL 1. Introduction Protein sequence databases are biological databases that store information about amino acid sequences of proteins, along with their functional, structural, and biochemical characteristics. Since proteins are the functional molecules of the cell, protein databases are essential for understanding gene expression, metabolism, enzymatic activity, signaling pathways, and evolution. Protein sequence databases mainly contain data derived from translated nucleotide sequences and experimental protein studies. 2. Types of Protein Sequence Databases Protein sequence databases are broadly classified into: A. Primary Protein Databases Contain original protein sequence data Minimal or no manual annotation B. Secondary Protein Databases Derived from primary databases Provide curated functional and structural information C. Composite Protein Databases Combine protein data from multiple sources Reduce redundancy 3. Protein Informati...

༺☆ DOT BLOT (DOT BLOTTING)

DOT BLOT (DOT BLOTTING) *ੈ✩‧₊˚༺☆༻*ੈ✩‧₊˚*ੈ✩‧₊˚༺☆༻*ੈ✩‧₊˚ Introduction Dot blot is a simple and rapid molecular biology technique used to detect specific DNA, RNA, or proteins immobilized directly onto a solid membrane without electrophoretic separation. It is a modification of Southern, Northern, and Western blotting, but unlike them, dot blot does not involve gel electrophoresis. The technique is mainly used for screening large numbers of samples, qualitative or semi-quantitative analysis, and diagnostic purposes. Principle of Dot Blot The principle of dot blotting is based on specific binding between a target molecule and a labeled probe or antibody. The sample containing DNA/RNA/protein is directly applied as a dot on a nitrocellulose or nylon membrane. The molecules bind to the membrane by hydrophobic and electrostatic interactions. The membrane is then incubated with a specific probe (for nucleic acids) or antibody (for proteins). Detection is achieved using radioactive, enzymatic, ...

❃LC-MS (LIQUID CHROMATOGRAPHY – MASS SPECTROMETRY)

LC-MS (LIQUID CHROMATOGRAPHY – MASS SPECTROMETRY) ┏━━━━━ •❃°•°❀°•°❃•━━━━•━━━┓ 1. INTRODUCTION LC-MS is a hyphenated analytical technique combining Liquid Chromatography (LC) and Mass Spectrometry (MS). It is used for separation, identification, and quantification of compounds in complex mixtures. LC separates analytes based on polarity, size, or charge, while MS detects molecules based on mass-to-charge ratio (m/z). Developed in the 1970s–1980s, LC-MS is now widely used in pharmaceutical, clinical, environmental, and food analysis. Importance : Detects trace levels of compounds (ng–pg range) Analyzes non-volatile, thermally labile compounds that cannot be analyzed by GC-MS Provides structural information through mass fragmentation Example: Detection of drugs in plasma, protein identification in proteomics, pesticide residue analysis in food. 2. COMPONENTS OF LC-MS The LC-MS system has three main parts: A. Liquid Chromatograph (LC) Function: Separates components of a mixture befor...

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...

❥ 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...

Callus Culture and Regeneration of Plants

Callus Culture and Regeneration of Plants Introduction Callus culture is an in vitro plant tissue culture technique in which an unorganized mass of proliferating cells (callus) is induced from explants such as leaf, stem, root, or meristem under aseptic and controlled conditions. These callus cells retain totipotency, enabling regeneration of complete plants under suitable hormonal and nutritional conditions. Callus culture forms the foundation of plant biotechnology, playing a crucial role in micropropagation, genetic transformation, somaclonal variation, and secondary metabolite production. Definition Callus is a mass of undifferentiated parenchymatous cells produced by continuous cell division of explant tissues when cultured on a nutrient medium supplemented with plant growth regulators. Principle of Callus Culture Based on the concept of cellular totipotency. Dedifferentiation of mature cells occurs due to the action of auxins and cytokinins. Redifferentiation and organ formation ...

••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...

Genetically modified microbes - biodegradation, biopesticides, bioremediation, mineral leaching and biofertilizers.

Genetically Modified Microbes (GMMs) covering biodegradation, biopesticides, bioremediation, mineral leaching and biofertilizers. Genetically Modified Microbes (GMMs) Introduction Genetically Modified Microbes (GMMs) are microorganisms such as bacteria, fungi, yeast or algae whose genetic material has been altered using recombinant DNA technology to enhance or introduce desirable traits. These microbes are engineered to improve efficiency, specificity and speed of biological processes useful in agriculture, industry and environmental management. GMMs play a vital role in sustainable development by reducing dependence on chemical fertilizers, pesticides and polluting industrial processes. 1. Genetically Modified Microbes in Biodegradation Definition Biodegradation is the microbial breakdown of complex organic pollutants into simpler, non-toxic substances. Role of GMMs Natural microbes often degrade pollutants slowly. Genetic modification enhances: Enzyme activity Substrate sp...

Third Semester M.Sc. Botany -Internal Examination Feb 2024 Plant breeding, horticulture & Biostatistics

First Semester M.Sc. Botany -Internal Examination Feb 2024 Plant breeding, horticulture & Biostatistics I Answer the following questions . 1.What do you mean by microcenters? 2. What are biofertilizers? 3. What is acclimatization? 4. Differentiate heterosis and hetrobeltiosis 5. What is null hypothesis? 6. What is ANOVA 7.What is arboriculture 8. Expand NBPGR 9. Name the most potent chemical mutagen 10. What do you mean by male sterility? How is it attained in plant breeding method (10*1= 10) II Answer the following in not more than 50 words 11. a. Explain hybridization and mention its procedure. OR b. Different types of sampling methods. 129. a. Brief account on indoor gardens. OR 13b. What is seed certification? How is it done? 10. a. What is topiary? Give examples. Differentiate OR b. What is seed propagation? correlation & Regression. 14. a. Write short notes on the concept of the centers of origin proposed Vavilov b. What is landscaping? OR 12. a. Write notes on cutta...

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