1. Amino Acids :  They are the building blocks of proteins. Chemically, they are compounds containing amino (NH2) and carboxyl (-COOH) groups.

  2. Biomolecule : Living systems are made up of various complex chemical substances that play specific functions, such molecules are called biomolecules.

  3. Carbohydrates : Compounds of carbon, hydrogen and oxygen (in which hydrogen and oxygen atoms are in the ratio of 2 : 1) are called carbohydrates, which serve as food are broken into simpler sugars called monosaccharides.

  4. Cell : Basic unit of life. It is the smallest structural and functional unit of a living organism, (Plants and animals) Human body has millions of cells, several millions being in a drop of blood.

  5. Cell biology : Study of the structure, behavior growth and reproduction of cell and functioning of cell components.

  6. Cell body : Enlarged body of neuron containing the nucleus, also called cyton.

  7. Cell differentiation : Process by which embryonic cells develop into various cell types making up the body of plants or animals.

  8. Cell division : Process by which living cells multiply. May be amitotic or mitotic or meiotic.

  9. Cell fusion : Fusion of two cells in tissue culture.

  10. Cell membrane : Thin layer of protoplasm consisting mainly of double phospholipid layer and proteins present on the surface of cells.

  11. Cell sap : The liquid contents present in the vacuoles of a plant cell is termed as cell sap.

  12. Cell wall : Semirigid permeable structure composed of cellulose and lignin etc. that envelops plant cell. (Animal cells lack cell wall).

  13. Cell-inclusion : A small nonliving intracellular particle, usually representing stored food, not vital to life processes.

  14. Cellular affinity : Phenomenon of selective adhesiveness observed among the cells of certain slime molds, sponges and vertebrates.

  15. Cellular pool : Collection of various types of molecules in a cell.

  16. Cellular respiration : A catabolic process in which complex organic molecules are broken down to release energy.

  17. Cellulose : Cellulose is the substance of which cell wall is made up of.

  18. Cytochemistry : Chemistry of cells and cell components with the location of chemical constituents and enzymes.

  19. Cytochrome : Any of the complex protein respiratory pigments occurring within plant and animal cells.

  20. Cytology : Study of cells.

  21. Cytolysis : Breakdown of cells.

  22. Cytoplasm : General fluid mass of the cell outside the nucleus. It contains several organelles that can be identified by their appearance and chemistry when appropriately stained.

  23. Dicentric : Chromosome having two centromeres.

  24. Gel : A semi-rigid colloid.

  25. Macromolecules : The large number of small molecule polymerise to give macromolecules such as proteins, nucleic acids etc.

  26. Nucleolus : It is a dense structure present in the nucleus, mainly contains RNA forms Ribosome.

  27. Oligosaccharidas :These sugars are formed by the combination of 2-6 monosaccharide molecules, by involving the loss of water and the process is called condensation. The bond thus formed is glycosidic bond.

  28. Semen : It is the fluid containing sperm and various glandular secretion ejaculated by the male during copulation.

  29. Small molecules : These molecules have low molecular weight, simpler molecular conformation and usually higher stabilities.