The CSIR-UGC National Eligibility Test (NET) for Life Sciences is designed to evaluate a candidate’s conceptual understanding, analytical ability, and research aptitude. The syllabus covers thirteen broad units that integrate molecular biology, physiology, genetics, ecology, immunology, evolution, and applied life sciences. Below is a comprehensive, unit-wise breakdown of the syllabus written in a detailed yet readable format.
Unit 1: Molecules and Their Interaction Relevant to Biology
Life at the molecular level revolves around atoms, molecules, and chemical bonds that form the basis of biological macromolecules. The unit begins with the structure of atoms and molecules, explaining covalent, ionic, hydrogen, hydrophobic, and van der Waals interactions that stabilize biomolecular structures. It further examines carbohydrates, lipids, proteins, nucleic acids, and vitamins, focusing on their chemical composition, three-dimensional organization, and biological functions.
Students learn about biophysical chemistry concepts such as pH, buffers, thermodynamics, reaction kinetics, and colligative properties that govern biological reactions. The section on bioenergetics covers glycolysis, oxidative phosphorylation, coupled reactions, ATP as an energy currency, and mechanisms of biological energy transduction. Enzymology emphasizes enzyme catalysis, regulation, kinetics, and isoenzymes along with conformational features of proteins (Ramachandran plots, secondary structures, motifs, domains, and folds) and nucleic acids (A, B, Z DNA, tRNA, and microRNA). Finally, the metabolic pathways of carbohydrates, amino acids, nucleotides, lipids, and vitamins are integrated to explain how living organisms maintain energy and biosynthetic balance.
Unit 2: Cellular Organization
This unit describes the architecture of cell membranes including model membrane structure, lipid bilayers, and membrane protein dynamics, explaining diffusion, osmosis, active transport, ion channels, pumps, and the regulation of intracellular transport. The structural organization of intracellular organelles such as the nucleus, mitochondria, Golgi apparatus, endoplasmic reticulum, lysosomes, peroxisomes, plastids, and cytoskeleton is discussed to highlight their functional coordination.
The unit also covers organization of genes and chromosomes, including operons, repetitive DNA, chromatin remodeling, heterochromatin, euchromatin, and mobile genetic elements such as transposons. The cell cycle and its regulation—covering mitosis, meiosis, checkpoints, and molecular controls—is explained alongside microbial physiology, which deals with growth characteristics, stress responses, and cell division strategies.
Unit 3: Fundamental Processes
The central dogma of molecular biology is covered here. Students learn about DNA replication, the enzymes involved, replication origins and forks, fidelity mechanisms, and DNA repair pathways such as base excision, nucleotide excision, and mismatch repair. Recombination mechanisms, both homologous and site-specific, are also explained.
Transcription covers RNA polymerases, transcription factors, promoter recognition, RNA processing (capping, splicing, editing, and polyadenylation), and nuclear transport of RNA. Translation discusses ribosome structure, initiation, elongation, termination, aminoacyl-tRNA synthetase function, proof-reading, inhibitors of translation, and post-translational modifications. Gene regulation at transcriptional and translational levels is examined for prokaryotes, eukaryotes, phages, and viruses, along with chromatin-mediated gene silencing.
Unit 4: Cell Communication and Cell Signaling
Cellular communication ensures coordinated function. The unit covers host-pathogen interactions, including recognition, viral entry, cell fusion, transformation, and pathogen-induced disease. Signal transduction pathways such as G-protein coupled receptor signaling, bacterial two-component systems, quorum sensing, and plant light signaling are explained, with emphasis on second messengers and regulatory checkpoints.
The immune system is introduced, covering innate and adaptive immunity, antigen processing and presentation, antibody structure and diversity, B and T cell receptors, and the complement cascade. Immunological disorders such as hypersensitivity, autoimmunity, and immunodeficiencies are discussed alongside vaccine design. The unit also explains cancer biology, focusing on oncogenes, tumor suppressors, metastasis, apoptosis, and therapeutic interventions.
Unit 5: Developmental Biology
Developmental biology explores how a single cell transforms into a complex multicellular organism. The unit begins with concepts such as potency, specification, determination, differentiation, morphogenetic gradients, and stem cells. Genomic equivalence, imprinting, and the use of mutants and transgenics to analyze development are described.
The process of gametogenesis, fertilization, and early embryogenesis in plants and animals is discussed, including sperm-egg recognition, zygote formation, cleavage, gastrulation, and germ layer formation. In animals, morphogenesis and organogenesis cover axis formation in Drosophila, amphibians, and chick, organ development such as vulva formation in C. elegans, lens induction, limb development, neuronal differentiation, and regeneration. Plant morphogenesis focuses on shoot/root apical meristems, leaf formation, flowering, and floral development. The unit concludes with programmed cell death, aging, and senescence.
Unit 6: System Physiology – Plant
This section explores how plants function as integrated systems. Photosynthesis is covered in depth, from light-harvesting complexes and electron transport to photoprotective mechanisms and CO₂ fixation pathways (C3, C4, CAM). Respiration and photorespiration, including mitochondrial electron transport and ATP synthesis, are also discussed.
Nitrogen metabolism, amino acid biosynthesis, and plant hormone physiology—biosynthesis, transport, storage, and mechanism of action—are examined. Sensory photobiology includes phytochromes, cryptochromes, phototropins, and photoperiodism. Students also learn about solute transport, phloem/xylem loading, transpiration, secondary metabolites like terpenes and phenolics, and plant stress responses to water, salinity, temperature, and pathogens.
Unit 7: System Physiology – Animal
Animal physiology is approached comparatively. The blood and circulatory system section describes hematopoiesis, blood groups, plasma function, hemostasis, and immune responses. The cardiovascular system explains heart anatomy, ECG interpretation, and regulation of cardiac function. Respiratory physiology examines gas exchange, oxygen transport, and neural/chemical control mechanisms.
The nervous system covers neuron function, brain and spinal cord anatomy, and muscle control. Sensory physiology addresses vision, hearing, and tactile responses. The excretory system section explains kidney physiology, urine formation, osmoregulation, and electrolyte/acid-base balance. Topics also include thermoregulation, stress adaptation, digestive physiology, and endocrine regulation of reproduction.
Unit 8: Inheritance Biology
This unit traces principles of heredity from Mendel to molecular genetics. Topics include dominance, segregation, independent assortment, alleles, complementation, and gene interactions. Students learn about extensions of Mendelian inheritance such as codominance, incomplete dominance, linkage, pleiotropy, and genomic imprinting.
Gene mapping methods, extra-chromosomal inheritance (mitochondria and chloroplasts), microbial genetics (transformation, conjugation, transduction), and human genetics (pedigree analysis, genetic disorders) are discussed. Quantitative genetics, heritability, QTL mapping, mutation types, chromosomal rearrangements, and recombination mechanisms round out the unit.
Unit 9: Diversity of Life Forms
Biodiversity is studied through taxonomy, structural organization, and evolutionary relationships among plants, animals, and microorganisms. Methods of species classification, levels of biological organization, and adaptive modifications are explained. The natural history of India, major habitats, migration patterns, and seasonal variations are covered. Attention is also given to organisms of medical and agricultural importance, along with rare and endangered species and conservation strategies.
Unit 10: Ecological Principles
This unit explores environmental interactions, concepts of habitat and niche, and population ecology including growth models, life history strategies, and metapopulation dynamics. Species interactions such as competition, predation, pollination, and symbiosis are explained. Community ecology topics include structure, diversity measurement, and ecotones, while ecological succession examines mechanisms of change and climax communities.
Ecosystem ecology integrates energy flow, nutrient cycles (C, N, P), and Indian ecosystems such as forests, grasslands, freshwater, and marine biomes. Biogeography introduces island biogeography theory, biogeographic zones of India, and conservation biology with case studies such as Project Tiger and biosphere reserves.
Unit 11: Evolution and Behavior
The emergence of evolutionary thought from Lamarck to Darwin and the modern synthesis is discussed. Topics include origin of life, abiotic synthesis of biomolecules, the first cells, prokaryotic and eukaryotic evolution, and metabolic transitions. Paleontology traces evolutionary timelines, origins of multicellularity, and primate evolution leading to Homo sapiens.
Molecular evolution covers neutral theory, molecular clocks, gene duplication, and divergence. Population genetics explains Hardy–Weinberg equilibrium, genetic drift, migration, selection, speciation, convergent evolution, and co-evolution. Behavioral biology examines learning, memory, biological clocks, social communication, altruism, mating systems, migration, and parental care, integrating neural and evolutionary perspectives.
Unit 12: Applied Biology
This unit highlights practical applications of biology. Topics include microbial fermentation, vaccine development, diagnostics, transgenic organisms, gene therapy, and molecular diagnostics. The use of genomics in agriculture and health, biodiversity as a resource, plant and animal breeding (including marker-assisted selection), bioremediation and phytoremediation, and the development of biosensors are also covered.
Unit 13: Methods in Biology
The final unit focuses on laboratory and analytical techniques. It includes recombinant DNA methods, nucleic acid and protein purification, gel electrophoresis, molecular cloning, mutagenesis, gene knockouts, protein sequencing, genome sequencing, and microarray analysis. Students learn histochemical, immunological, and biophysical methods (ELISA, RIA, western blotting, spectroscopy, X-ray diffraction, NMR, mass spectrometry), microscopy techniques (light, electron, confocal), and electrophysiological methods (patch-clamp, EEG, fMRI, PET).
Field biology covers population sampling, behavioral studies, habitat analysis, and statistical approaches including regression, correlation, ANOVA, and probability distributions. Radiolabeling techniques and safety guidelines are also emphasized.
