Class XI

Unit 1: Modern Biotechnology

Definition of Sciences Related to Biotechnology:
- Includes disciplines such as genetics, microbiology, biochemistry, and molecular biology.
Contribution of Louis Pasteur:
- Known for his work in fermentation, establishing principles of microbiology and fermentation processes.
Definition of Key Terms:
- Fermentation: A metabolic process converting sugar to acids, gases, or alcohol using microorganisms.
- Bioprocess Technology: The use of natural or engineered biological systems to develop products.
- Biosensors: Devices that use biological materials to detect chemicals or biological molecules.
- Recombinant DNA Technology: Techniques that allow the manipulation of DNA and the combining of genetic material from different organisms.

Health Industry: Development of vaccines, diagnostics, and therapeutic proteins.
Agriculture Industry: Genetic modification for pest resistance and improved yield.
Chemical Industry: Production of biofuels, biopolymers, and other biochemicals.
Cleaning Industry: Use of microbes for bioremediation of pollutants.
Textile Industry: Use of enzymes for fabric processing.
Pulp and Paper Industry: Enzymatic processes to improve bleaching and pulping.

Types of Cells Used:
- Mammalian cells, Bacteria, Yeast: Different cells produce various products; e.g., insulin from bacteria, monoclonal antibodies from mammalian cells.
Origin and Development of Biotechnology in India:
- Focus on historical milestones and advancements in the field.

General Formula: Cn(H2O)n
Aldoses and Ketoses:
- Aldoses: Sugars with an aldehyde group (e.g., glucose).
- Ketoses: Sugars with a ketone group (e.g., fructose).
Natural Configuration of Sugars:
- D-configuration is common in natural systems.
Fischer and Haworth Projections:
- Fischer: 2D representation of sugars.
- Haworth: 3D cyclic representation of sugars.
Anomeric Carbon:
- The carbon in a sugar molecule that becomes a new chiral center during ring formation.
Disaccharides:
- Example: Sucrose (non-reducing), Lactose (reducing), Maltose (reducing).
Testing for Reducing Sugars:
- Benedict’s Test and Fehling’s Test: Tests to identify reducing sugars.
Carbohydrate Bonds:
- Glycosidic bonds link monosaccharides together.

Naturally Occurring Amino Acids: 20 different types.
General Structure:
- Central carbon (C) bonded to amino group, carboxyl group, hydrogen atom, and R group (side chain).
Natural Configuration: L-configuration.
Categories of Amino Acids:
- Categories: Essential, Non-essential, Semi-essential (e.g., leucine, glycine).
Test for Amino Acids:
- Ninhydrin Test; exceptions include proline which gives negative result.
Functions of Amino Acids:
- Essential amino acids play roles in protein synthesis and various metabolic pathways.

Solubility: Lipids are soluble in organic solvents.
Building Blocks: Fatty acids and glycerol; triacylglycerols are main lipid form.
Tests for Lipids:
- Sudden appearance in grease spots or water-soluble tests.

Monomeric Unit: Nucleotide.
Basic Structure of Nucleotide:
- Composed of a sugar, phosphate group, and nitrogenous base (purines: A, G; pyrimidines: C, T, U).
Orcinol Method: For detecting nucleic acids.

Father of Genetics: Gregor Mendel.
Coined Term: "Genetics" by William Bateson.
Sutton and Boveri: Developed the chromosomal theory of inheritance.
Mendel's Laws of Inheritance: Law of Segregation, Law of Independent Assortment.
Monohybrid vs Dihybrid Cross: Monohybrid involves one trait; Dihybrid involves two traits.
Blending Theory: An obsolete theory suggesting traits mix evenly.
Mendel's Pea Plant Study: Investigated traits like seed shape and color.

Alleles: Different versions of a gene.
Homozygotes and Heterozygotes: Homozygotes possess identical alleles; heterozygotes have differing alleles.
Dominant and Recessive Traits: Dominant traits manifest even in heterozygotes; recessive traits require homozygotes.
Test Cross: An organism with an unknown genotype crossed with a homozygous recessive organism.

Incomplete Dominance vs Co-dominance: Incomplete dominance shows blending; co-dominance both traits appear equally.
Linkage and Crossing Over: Linkage refers to genes on the same chromosome; crossing over during meiosis leads to recombination.
Genetic Mapping and Recombination Frequency: Helps to find the distances between genes.
Centimorgan (cM): Unit of distance on the genetic map.

Cell Biology Definition: Study of cell structure and function.
Animal vs. Plant Cells: Differences include cell wall presence, organelles.
Functions of Cell Membrane: Defines cell boundary, regulates transport, cell communication.
Fluid Mosaic Model: Describes the cell membrane structure and dynamics.

Diagrammatic Structures: Learn the structures and functions of organelles.
Nucleoid: Region in prokaryotic cells containing genetic material.
Euchromatin vs Heterochromatin: Euchromatin is less condensed and actively involved in transcription; heterochromatin is more compacted and transcriptionally inactive.

Stages of Mitosis: Prophase, Metaphase, Anaphase, Telophase; significance in cell division.
Stages of Meiosis: Includes Meiosis I (homologous chromosomes separate) and Meiosis II (sister chromatids separate).
Cell Cycle Phases: Interphase (G1, S, G2) and Mitotic phase (M).

Signaling Molecules and Receptors: Molecules that influence cellular activities; receptors facilitate communication.
Types of Receptors: Include ion channel-linked receptors and G protein-coupled receptors.

Macroelements and Microelements: Essential nutrients for plant and microbial nutrition.
Modes of Nutrition in Plants and Microbes: Photosynthesis in plants; various methods in microbes.

Immune Response Overview: Body's defense mechanism against pathogens.
Lymphoid Organs: Organs involved in immune system development, including thymus and spleen.
Types of Immune Responses: Cell-mediated and humoral responses; functions of immunoglobulins and immune cells.